Products Home / Optomechanical Components / Optomechanical Mounts / Optical Mirror Mounts / Polaris® Mirror Mounts / Polaris® SM-Threaded Low Drift Kinematic Mirror MountsPolaris® SM-Threaded Low Drift Kinematic Mirror Mounts
- SM-Threaded Mounting Bore
- Matched Actuator and Back Plate Threading Minimize Drift and Backlash
- Minimal Temperature-Dependent Hysteresis
- Sapphire Adjuster Seats Prevent Wear Over Time
POLARIS-K05T6
SM05-Threaded Mount Shown with a Fiber Collimator and AD1109F Adapter
POLARIS-K2T1
2-Adjuster
SM2-Threaded
Polaris Mount
POLARIS-K1T
3-Adjuster
SM1-Threaded
Mount
Please Wait
Click to Enlarge
Each Polaris mount undergoes extensive thermal testing to ensure high-quality performance. Please see the Test Data tab for additional test results.
| Quick Links | |
|---|---|
| Ø1/2" SM05-Threaded Mounts | |
| Ø1" SM1-Threaded Mounts | |
| Ø2" SM2-Threaded Mounts | |
| Adjuster Accessories | |
| Lock Nuts | |
| Locking Collar | |
| Torque Wrenches |
Features
- Machined from Heat-Treated Stainless Steel with Low Coefficient of Thermal Expansion (CTE)
- SM-Threaded Bore for Mounting Optics, Lens Tubes, or Other Components
- Hardened Stainless Steel Ball Contacts with Sapphire Seats for Durability and Smooth Movement
- Matched Actuator and Back Plate Provide Stability and Smooth Kinematic Adjustment
- Extensive Testing Guarantees Less than 2 μrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab for Details)
- Passivated Stainless Steel Surface Ideal for Vacuum and High-Power Laser Cavity Applications
- Custom Mount Configurations are Available by Contacting Tech Support
Polaris® SM-Threaded Kinematic Mirror Mounts are the ultimate solution for applications requiring stringent long-term alignment stability.
Optic Retention
All of the mounts sold here feature an SM05-threaded (0.535"-40), SM1-threaded (1.035"-40), or SM2-threaded (2.035"-40) bore which allows a variety of optical components to be secured in the mount. Two stainless steel retaining rings are included with each mount; additional retaining rings can also be purchased separately.
Polaris optic bores are precision machined to achieve a fit that will provide optimum beam pointing stability over changing environmental conditions such as temperature changes, transportation shock, and vibration. Performance will be diminished if these mounts are used with optics that have an outer diameter tolerance greater than zero or smaller metric optic sizes (Ø12.5 mm, Ø25 mm, or Ø50 mm).
Design
Machined from heat-treated stainless steel, Polaris mounts utilize precision-matched adjusters with ball contacts and sapphire seats to provide smooth kinematic adjustment. As shown on the Test Data tab, these mounts have undergone extensive testing to ensure high-quality performance. The Polaris design addresses all of the common causes of beam misalignment; please refer to the Design Features tab for detailed information.
Post Mounting
The Polaris mirror mounts are equipped with #8 (M4) counterbores for post mounting. Select mounts also include Ø2 mm alignment pin holes around the mounting counterbore, allowing for precision alignments when paired with our Ø1" Posts for Polaris Mirror Mounts. We also recommend using a torque driver or spanner wrench to accurately install the optic and prevent optical surface distortion. See the Usage Tips tab for more recommendations on mounting configurations.
Cleanroom and Vacuum Compatibility
All Polaris mounts on this page are designed to be compatible with cleanroom and vacuum applications. See the Specs tab and the Design Features tab for details.
| Item # Suffixa | -K05T6 | -K05T1 | -K05T2 | -K1T | -K1T3 | -K1T1 | -K1T2 | -K2T | -K2T3 | -K2T1 | -K2T2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Optic Sizes | Ø1/2" | Ø1" | Ø2" | ||||||||
| Optic Thickness (Max) | 0.25" (6.4 mm) | 0.34" (8.6 mm) | 0.50" (12.7 mm) | ||||||||
| Number of Adjusters | Three | Two | Three | Two | Three | Two | |||||
| Adjuster Drive | 5/64" Hex | Low-Profile 5/64" Hex |
5/64" Hex | Removable Knobs |
5/64" Hex | Removable Knobs |
5/64" Hex | Removable Knobs |
5/64" Hex | Removable Knobs |
5/64" Hex |
| Adjuster Pitch | 130 TPI Matched Actuator/Body Pairs | 100 TPI Matched Actuator/Body Pairs | |||||||||
| Measured Point-to-Point Mechanical Resolution per Adjuster |
5 µrad (Typical) 2 µrad (Achievable) |
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| Measured Adjuster Lock Mechanical Resolution per Adjuster |
5 µrad (Typical) 2 µrad (Achievable) |
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| Resolutionb | ~11 mrad/rev | ~7.7 mrad/rev | ~5 mrad/rev | ||||||||
| Front Plate Translation (Max) | 5 mm | N/A | 6 mm | N/A | 6 mm | N/A | |||||
| Mechanical Angular Range (Nominal) | ±5° | ±4° | ±3.4° | ||||||||
| Beam Deviationc After Thermal Cycling | <2 μrad | <1 µrad | <2 µrad | ||||||||
| Recommended Optic Mounting Torque | 6 - 20 oz-in for 6 mm Thick Optics | 5 - 24 oz-in for 8.6 mm Thick Optics | 10 - 24 oz-in for 12.7 mm Thick Optics | ||||||||
| Maximum SM-Threaded Component Mounting Torqued | 15 lb-in for SM05-Threaded Parts | 30 lb-in for SM1-Threaded Parts | 45 lb-in for SM2-Threaded Parts | ||||||||
| Maximum Front Plate Payload (Torque / Weight) |
1 lb-in (0.11 N·m) / 1 lb (4.5 N) | 2.5 lb-in (0.28 N·m) / 1.25 lb (5.6 N) |
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| Mountinge | Two #8 (M4) Counterbores | Four #8 (M4) Counterbores | |||||||||
| Alignment Pin Holes | Two Ø2 mm Holes for DIN 7-m6 Ground Dowel Pin at Each Counterbore | ||||||||||
| Vacuum Compatibilityf | 10-9 Torr at 25 °C with Proper Bake Out; 10-5 Torr at 25°C without Bake Out DuPont Krytox® LVP High-Vacuum Grease Vapor Pressure: 10-13 Torr at 20 °C ,10-5 Torr at 200 °C EPO-TEK® 353ND (353NDPK) Epoxy Meets Low Outgassing Standards NASA ASTM E595, Telcordia GR-1221 |
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| Operating Temperature Range | -30 to 200 °C | ||||||||||
Polaris® Mirror Mounts Test Data
All of the Polaris Low-Drift Kinematic Mirror Mounts have undergone extensive testing to ensure high-quality performance. After mounting the Polaris to a Ø1" stainless steel post, the mirror and post assembly was secured to a stainless steel optical table in a temperature-controlled environment. A beam from an independently temperature-stabilized laser diode was reflected by the mirror onto a position sensing detector. The mirror was secured between the two retaining rings included with the Polaris mount, not using epoxy.
Positional Repeatability After Thermal Shock
Purpose: This testing was done to determine how reliably the mount returns the mirror, without hysteresis, to its initial position. These measurements show that the alignment of the optical system is unaffected by the temperature shock.
Procedure: The temperature of each mirror mount tested was raised to 37 °C and maintained for a given soak time. Then the temperature of the mirror mount was returned to the starting temperature. The results of these tests are shown below.
Results: As can be seen in the plots in the expandable tables below, when the Polaris mounts were returned to their initial temperature, the angular position (both pitch and yaw) of the mirrors returned to within 2 µrad of its initial position. The performance of the Polaris was tested further by subjecting the mount to repeated temperature change cycles. After each cycle, the mirror’s position reliably returned to within 2 µrad of its initial position.
For Comparison: To get a 1 µrad change in the mount’s position, the 100 TPI adjuster on the Ø1" Polaris mounts needs to be rotated by only 0.05° (1/7200 of a turn). A highly skilled operator might be able to make an adjustment as small as 0.3° (1/1200 of a turn), which corresponds to 6 µrad.
Conclusions: The Polaris Mirror Mounts are high-quality, ultra-stable mounts that will reliably return a mirror to its original position after cycling through a temperature change. As a result, the Polaris mounts are ideal for use in applications that require long-term alignment stability.
| Ø1/2" Mounts |
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| Ø1" Mounts |
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| Ø2" Mounts |
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Click to Enlarge
Design Features of the Polaris SM-Threaded Mounts
Several common factors typically lead to beam misalignment in an optical setup. These include temperature-induced hysteresis of the mirror's position, crosstalk, drift, and backlash. Polaris mirror mounts are designed specifically to minimize these misalignment factors and thus provide extremely stable performance. Hours of extensive research, multiple design efforts using sophisticated design tools such as finite element analysis software, and months of rigorous testing went into choosing the best components to provide an ideal solution for experiments requiring ultra-stable performance from a kinematic mirror mount.
Thermal Hysteresis
The temperature in most labs is not constant due to factors such as air conditioning, the number of people in the room, and the operating states of equipment. Thus, it is necessary that all mounts used in an alignment-sensitive optical setup be designed to minimize any thermally induced alignment effects. Thermal effects can be minimized by choosing materials with a low coefficient of thermal expansion (CTE), like stainless steel. However, even mounts made from a material with a low CTE do not typically return the mirror to its initial position when the initial temperature is restored. All the critical components of the Polaris mirror mounts are heat treated prior to assembly since this process removes internal stresses that can cause a temperature-dependent hysteresis. As a result, the alignment of the optical system will be restored when the temperature of the mirror mount is returned to the initial temperature.
The method by which the mirror is secured in the mount is another important design factor for the Polaris; these Polaris mounts offer excellent performance without the use of adhesives. Instead, they have SM05-, SM1-, or SM2-threaded bores and two stainless steel retaining rings that hold the optic in place. The holding force provided by the stainless steel retaining rings is sufficient to keep the mirror locked into place regardless of the ambient temperature. This bore also allows other SM05-, SM1-, or SM2-threaded components to be secured in the mounts.
Crosstalk
Crosstalk is minimized by carefully controlling the dimensional tolerances of the front and back plates of the mount so that the pitch and yaw actuators are orthogonal. In addition, sapphire seats are used at all three contact points. Standard metal-to-metal actuator contact points will wear down over time. The polished sapphire seats of the Polaris mounts, in conjunction with the hardened stainless steel actuator tips, maintain the integrity of the contact surfaces over time.
Drift and Backlash
In order to minimize the positional drift of the mirror mount and backlash, it is necessary to limit the amount of play in the adjuster as well as the amount of lubricant used. When an adjustment is made to the actuator, the lubricant will be squeezed out of some spaces and built up in others. This non-equilibrium distribution of lubricant will slowly relax back into an equilibrium state. However, in doing so, this may cause the position of the front plate of the mount to move. The Polaris mounts use adjusters matched to the body that exceed all industry standards so very little adjuster lubricant is needed. These adjusters have a smooth feel that allows the user to make small, repeatable adjustments.
Click to Enlarge
Polaris Mounts are Shipped Inside Two Vacuum Bag Layers
Cleanroom and Vacuum Compatibility
All Polaris mounts, retaining rings, and lock nuts sold on this page are designed to be compatible with cleanroom and vacuum chamber applications. They are chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, they are assembled in a clean environment and double vacuum bagged to eliminate contamination when transported into a cleanroom.
The sapphire contacts are bonded into place using a NASA-approved low outgassing procedure. In addition, DuPont Krytox® LVP High-Vacuum Grease, an ultra-high-vacuum-compatible, low outgassing PTFE grease, is applied to the adjusters. The 8-32 and M4 cap screws included with the Polaris mounts are not rated for pressures below 10-5 Torr.
Each vacuum-compatible Polaris mount is packaged within two vacuum bag layers after assembly in a clean environment, as seen in the image to the right. These vacuum bags do not contain any desiccant materials and tightly wrap the mount preventing friction against the mount during shipping. This packing method protects the mount from corrosion, gas or liquid contamination, and particulates during transport. The first vacuum bag should be opened in a clean environment while the second vacuum bag should only be opened just prior to installation. When operating at pressures below 10-5 Torr, we highly recommend using an appropriate bake out procedure prior to installing the mount in order to minimize contamination caused by outgassing.
Click for Details
Spanner Bits and the TD24 Torque Driver Can Be Used to Mount Optics in SM-Threaded Polaris Mirror Mounts
Through thermal changes and vibrations, the Polaris kinematic mirror mounts are designed to provide years of use. Below are some usage tips to ensure that the mount provides optimal performance.
Match Materials
Due to its relatively low coefficient of thermal expansion, stainless steel was chosen as the material from which to fabricate the front and back plates of the Polaris mounts. When mounting, we recommend using components fabricated from the same material, such as our Ø1" Posts for Polaris Mirror Mounts and Polaris Clamping Arm.
Use a Wide Post
The Polaris' performance is optimized for use with our Ø1" Posts and our POLARIS-CA1(/M) clamping arm. These posts are made of stainless steel and provide two lines of contact with the mount, which help confine the bottom of the mount during variations in the surrounding temperature, thereby minimizing potential alignment issues.
Optic Mounting
Since an optic is prone to movement within its mounting bore, all optics should be mounted with the Polaris out of the setup to ensure accurate mounting that will minimize misalignment effects. As shown to the right, we recommend using a TD24 torque wrench with either an SPB05, SPB1, or SPB2 Spanner Bit for SM05-, SM1-, or SM2-threaded Polaris mounts, respectively. See the Specs tab for recommended torques. Over torquing the optic retaining rings can result in dramatic surface distortions.
Mounting SM-Threaded Components
Since the front plate of the Polaris mount can move independently from the back plate, it is important to secure the front plate while mounting SM-threaded components. This ensures that the front plate will not rotate with respect to the back plate and crack the sapphire seats at the contact point between the two plates.
Front Plate’s Position
Polaris mounts are designed to allow adjustments of up to 10° for the Ø1/2" mounts, 8° for the Ø1" mounts, and 6.8° for the Ø2" mounts. To achieve the best performance, it is recommended that the front plate be kept as parallel as possible to the back plate. This ensures the highest stability of the adjustments.
Mount as Close to the Table’s Surface as Possible
To minimize the impact of vibrations and temperature changes, it is recommended that your setup has as low of a profile as possible. Using short posts will reduce the Y-axis translation caused by temperature variations and will minimize any movements caused by vibrations. Mount the Polaris directly onto a flat surface such as a breadboard using a 8-32 to 1/4"-20 thread adapter (AE8E25E) or M4 x 0.7 to M6 x 1.0 adapter (AE4M6M). Using this mounting method, the instability introduced by a post will be eliminated.
Lock nut installation demonstrated with the POLARIS-LN1 lock nut on one of our low-distortion Polaris mounts. To install a lock nut without cross threading, gently place the lock nut against the end of the adjuster. "Unscrew" the nut until the threads of the nut and the adjuster align; then thread the nut onto the adjuster.
Polish and Clean the Points of Contact
We highly recommend that the points of contact between the mount and the post, as well as the post and the table, are clean and free of scratches or defects. For best results, we recommend using a polishing stone to clean the table’s surface and a polishing pad (LFG1P) for the top and bottom of the post as well as the bottom of the mount.
Not Recommended
We do not recommend taking the adjusters out of the body, as it can contaminate the threading. This can reduce the fine adjustment performance significantly. Also, do not pull the front plate away as it might stretch the springs beyond their operating range or crack the sapphire seats.
Adjuster Lock Nuts
The Ø1" and Ø2" Polaris mounts below are compatible with the POLARIS-LN1 lock nuts for long-term stability or applications that are exposed to shock and vibration. POLARIS-LN05 lock nuts are pre-installed onto the adjuster for compatible Ø1/2" Polaris mounts. The beam can be held on target with the adjuster thumbscrew or hex key while lightly tightening the lock nut by hand or with a thin-head wrench or cone wrench. For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened by hand to a torque of approximately
4 to 8 oz-in (0.03 to 0.06 N·m). If long term stability is required, the torque wrenches below can be used to apply the appropriate amount of torque to each lock nut (see the table below for torque values). The POLARIS-LN1 lock nuts have a 13 mm hex and the POLARIS-LN05 lock nuts have a 6 mm hex.
To avoid cross threading the POLARIS-LN1 during installation, place it against the adjuster and "unscrew" the lock nut until you feel a slight drop, then thread the lock nut onto the adjuster (see the animation to the left). Each lock nut is pre-greased with the same ultra-high-vacuum-compatible, low-outgassing PTFE grease as the Polaris mounts and has been tested for adjuster fit.
Thorlabs' Threading Specifications
Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.
| SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 0.535"-40.0, UNS-2A | Internal Thread, 0.535"-40.0, UNS-2B | ||
| Max Major Diameter | 0.5340" | Min Major Diameter | 0.5350" |
| Min Major Diameter | 0.5289" | Min Pitch Diameter | 0.5188" |
| Max Pitch Diameter | 0.5178" | Max Pitch Diameter | 0.5230" |
| Min Pitch Diameter | 0.5146" | Min Minor Diameter (and 83.3% of thread) | 0.508" |
| Max Minor Diameter | 0.5069" | Max Minor Diameter (and 64.9% of thread) | 0.514" |
| RMS Threading: Objective, Scan, and Tube Lenses | |||
|---|---|---|---|
| External Thread, 0.800"-36.0, UNS-2A | Internal Thread, 0.800"-36.0, UNS-2B | ||
| Max Major Diameter | 0.7989" | Min Major Diameter | 0.8000" |
| Min Major Diameter | 0.7934" | Min Pitch Diameter | 0.7820" |
| Max Pitch Diameter | 0.7809" | Max Pitch Diameter | 0.7866" |
| Min Pitch Diameter | 0.7774" | Min Minor Diameter (and 83.3% of thread) | 0.770" |
| Max Minor Diameter | 0.7688" | Max Minor Diameter (and 64.9% of thread) | 0.777" |
| C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras | |||
|---|---|---|---|
| External Thread, 1.000"-32.0, UN-2A | Internal Thread, 1.000"-32.0, UN-2B | ||
| Max Major Diameter | 0.9989" | Min Major Diameter | 1.0000" |
| Min Major Diameter | 0.9929" | Min Pitch Diameter | 0.9797" |
| Max Pitch Diameter | 0.9786" | Max Pitch Diameter | 0.9846" |
| Min Pitch Diameter | 0.9748" | Min Minor Diameter (and 83.3% of thread) | 0.966" |
| Max Minor Diameter | 0.9651" | Max Minor Diameter (and 64.9% of thread) | 0.974" |
| SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 1.035"-40.0, UNS-2A | Internal Thread, 1.035"-40.0, UNS-2B | ||
| Max Major Diameter | 1.0339" | Min Major Diameter | 1.0350" |
| Min Major Diameter | 1.0288" | Min Pitch Diameter | 1.0188" |
| Max Pitch Diameter | 1.0177" | Max Pitch Diameter | 1.0234" |
| Min Pitch Diameter | 1.0142" | Min Minor Diameter (and 83.3% of thread) | 1.008" |
| Max Minor Diameter | 1.0068" | Max Minor Diameter (and 64.9% of thread) | 1.014" |
| SM30 Threading: Ø30 mm Lens Tubes | |||
|---|---|---|---|
| External Thread, M30.5x0.5 | Internal Thread, M30.5x0.5 | ||
| Max Major Diameter | 30.480 mm | Min Major Diameter | 30.500 mm |
| Min Major Diameter | 30.371 mm | Min Pitch Diameter | 30.175 mm |
| Max Pitch Diameter | 30.155 mm | Max Pitch Diameter | 30.302 mm |
| Min Pitch Diameter | 30.059 mm | Min Minor Diameter (and 83.3% of thread) | 29.959 mm |
| Max Minor Diameter | 29.938 mm | Max Minor Diameter (and 64.9% of thread) | 30.094 mm |
| SM1.5 Threading: Ø1.5" Lens Tubes | |||
|---|---|---|---|
| External Thread, 1.535"-40, UNS-2A | Internal Thread, 1.535"-40, UNS-2B | ||
| Max Major Diameter | 1.5339" | Min Major Diameter | 1.535" |
| Min Major Diameter | 1.5288" | Min Pitch Diameter | 1.5188" |
| Max Pitch Diameter | 1.5177" | Max Pitch Diameter | 1.5236" |
| Min Pitch Diameter | 1.5140" | Min Minor Diameter (and 83.3% of thread) | 1.508" |
| Max Minor Diameter | 1.5068" | Max Minor Diameter (and 64.9% of thread) | 1.514" |
| SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 2.035"-40.0, UNS-2A | Internal Thread, 2.035"-40.0, UNS-2B | ||
| Max Major Diameter | 2.0338" | Min Major Diameter | 2.0350" |
| Min Major Diameter | 2.0287" | Min Pitch Diameter | 2.0188" |
| Max Pitch Diameter | 2.0176" | Max Pitch Diameter | 2.0239" |
| Min Pitch Diameter | 2.0137" | Min Minor Diameter (and 83.3% of thread) | 2.008" |
| Max Minor Diameter | 2.0067" | Max Minor Diameter (and 64.9% of thread) | 2.014" |
| SM3 Threading: Ø3" Lens Tubes | |||
|---|---|---|---|
| External Thread, 3.035"-40.0, UNS-2A | Internal Thread, 3.035"-40.0, UNS-2B | ||
| Max Major Diameter | 3.0337" | Min Major Diameter | 3.0350" |
| Min Major Diameter | 3.0286" | Min Pitch Diameter | 3.0188" |
| Max Pitch Diameter | 3.0175" | Max Pitch Diameter | 3.0242" |
| Min Pitch Diameter | 3.0133" | Min Minor Diameter (and 83.3% of thread) | 3.008" |
| Max Minor Diameter | 3.0066" | Max Minor Diameter (and 64.9% of thread) | 3.014" |
| SM4 Threading: Ø4" Fixed Lens Mounts | |||
|---|---|---|---|
| External Thread, 4.035"-40.0, UNS-2A | Internal Thread, 4.035"-40.0, UNS-2B | ||
| Max Major Diameter | 4.0337" | Min Major Diameter | 4.0350" |
| Min Major Diameter | 4.0286" | Min Pitch Diameter | 4.0188" |
| Max Pitch Diameter | 4.0175" | Max Pitch Diameter | 4.0245" |
| Min Pitch Diameter | 4.0131" | Min Minor Diameter (and 83.3% of thread) | 4.008" |
| Max Minor Diameter | 4.0066" | Max Minor Diameter (and 64.9% of thread) | 4.014" |
| Posted Comments: | |
user
(posted 2019-05-15 06:09:55.26) Hi
May i ask how long it can be lifted in Z-axis?
Thank you YLohia
(posted 2019-05-15 09:13:44.0) Hello, the POLARIS-K05T6 can be translated by a maximum of 5mm in the z-direction. m.duranddegevigney
(posted 2017-07-06 10:49:23.553) Hello,
Would it be possible to mount 2 or 3 piezo electric actuators on this Mount. (like on K05P2).
Best regards. nbayconich
(posted 2017-08-04 05:39:05.0) Thank you for contacting Thorlabs. I will reach out to you directly about our custom capabilities. mesmail
(posted 2015-09-18 09:10:25.813) Hi. I am using POLARIS-K1T8 for light collimation in outdoor. The problem is that under sun heating, the alignment deviates because thermal expansion of the POLARIS-K1T8. So at night, it works well but during the day, I loss the signal. Is there a solution or other item to use so that I have unchanged alignment. besembeson
(posted 2015-10-05 01:27:51.0) Response from Bweh at Thorlabs USA: We specify a 2 urad deviation after 12.5 deg C temperature cycling based of our extensive testing of these mounts with matched and low coefficient of thermal expansion, which is clearly not suitable for your application. However, it will be almost impossible to find such mounts made from material that can accommodate such large temperature fluctuations without leading to thermal stress that will cause misalignment. We don't have any better solution to these. It seems you may benefit from two or more sets of alignment states to cover the entire temperature variation range. If you have a target, you may also increase its area (if possible) to accommodate deviations. user
(posted 2014-03-06 16:46:22.29) The series is expanding. Don't know how we can select one from your product line. Do you have a selction guide kindly? myanakas
(posted 2014-03-06 08:20:25.0) Response from Mike at Thorlabs: We do offer a selection guide. It is located on every Polaris page and is on a tab called "Polaris Comparison". Within this tab each Polaris mirror mount is organized via item # suffix, and in this row you can click on the blue hyperlinked suffixes to view the product and, if you wish, add it to your cart. This link will bring you directly to this tab on the SM-threaded Polaris page (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6634&tabname=polaris comparison). cbrideau
(posted 2014-01-21 13:04:16.157) Regarding the indexing hole for a 2mm dowel pins: Would it be possible to put a matched hole on your 1" posts and sell the dowel? That way the mount could be rotationally locked when it is attached to the top of the post. It would cut down on another degree of freedom that the mount can walk. jlow
(posted 2014-01-27 04:50:22.0) Response from Jeremy at Thorlabs: I will contact you on quoting this. |
| Polaris Mount Optic Retention Methods (Click Image to Enlarge) | |||
|---|---|---|---|
| Side Lock | SM Threaded | Low Distortion | Glue In |
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| Polaris Mount Adjuster Types (Click Image for Details) | |||||
|---|---|---|---|---|---|
| Side Hole | Hex | Adjuster Knobs | Adjuster Lock Nuts |
Piezo Adjusters | Vertical-Drive Adjusters |
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Thorlabs offers several different general varieties of Polaris mounts, including kinematic side optic retention, SM-threaded, low optic distortion, piezo-actuated, vertical drive, and glue-in optic mounts, as well as a fixed monolithic mirror mount and fixed optic mounts. Click to expand the tables below and see our complete line of Polaris mounts, listed by optic bore size, and then arranged by optic retention method and adjuster type. We also offer a line of accessories that have been specifically designed for use with our Polaris mounts; these are listed in the table immediately below.
| Accessories for Polaris Mounts |
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| Ø1" Posts for Polaris Mirror Mounts |
| Polaris Clamping Arm |
| Polaris 45º Adapter |
| Polaris Mounts for Ø1/2" Optics |
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| Polaris Mounts for Ø19 mm (3/4") Optics |
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| Polaris Mounts for Ø25 mm Optics |
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| Polaris Mounts for Ø1" Optics |
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| Polaris Mounts for Ø1.5" Optics |
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| Polaris Mounts for Ø50 mm Optics |
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| Polaris Mounts for Ø2" Optics |
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| Polaris Mounts for Ø3" Optics |
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| Polaris Kinematic Platform Mount |
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Zoom
Click to Enlarge
Fixed Fiber Collimator Mounted in the POLARIS-K05T6 using the AD1109F Thread Adapter
- 3-Adjuster Hex-Driven Design with 130 TPI Matched Actuator/Body Pairs
- Designed for use with Ø1/2" Opticsa up to 0.25" (6.4 mm) Thick or SM05-Threaded (0.535"-40) Components
- ±5° Mechanical Angular Range with ~11 mrad/rev Resolution
- Less than 2 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
- 1" Wide Compact Footprint
The POLARIS-K05T6 Kinematic Mirror Mount contains an SM05-threaded (0.535"-40) bore for mounting Ø1/2" optics up to 0.25" (6.4 mm) thick or other components, as shown to the right. Kinematic adjustment is provided by three 130 TPI adjusters that are compatible with 5/64" hex keys; they may be adjusted with our HKTS-5/64 Hex Key Thumbscrew (sold below) or any other 5/64" (2 mm) hex wrench. The three-adjuster design provides tip and tilt plus Z-axis (optical axis) adjustment. Two-adjuster versions are also available below.
This mirror mount comes with three adjuster lock nuts that can be tightened by holding the adjuster with a 5/64" (2 mm) hex key while tightening the lock nut by hand or with a 6 mm open-ended wrench. For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 24 oz-in, which can be achieved by using our TW6 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (POLARIS-SM05RR) can also be purchased separately. Post mounting is provided by two #8 (M4) counterbores. Due to the shallow design of the counterbores, low-profile 8-32 and M4 cap screws are included for mounting without obstructing the transmissive beam path. The 8-32 cap screw accepts a 5/64" (2 mm) hex wrench, while the M4 cap screw accepts a 2.5 mm hex wrench. For custom mounting configurations, Ø2 mm alignment pin holes are located on both sides of each counterbore for setting a precise location and mounting angle. Standard DIN 7-m6 ground dowel pins are recommended; see the Docs icon (
) below for details.
a. Please note that these mounts are designed for Ø1/2" Optics and are not intended for use with the Ø12.5 mm metric mirror size.
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- 2-Adjuster Hex-Driven Design with 130 TPI Matched Actuator/Body Pairs
- Designed for use with Ø1/2" Opticsa up to 0.25" (6.4 mm) Thick or SM05-Threaded (0.535"-40) Components
- Low-Profile or Standard-Profile Adjusters
- ±5° Mechanical Angular Range with ~11 mrad/rev Resolution
- Less than 2 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
- 1" Wide Compact Footprint
These 2-adjuster Ø1/2" Polaris Kinematic Mirror Mounts are similar to the standard 3-adjuster version sold above but feature a hardened steel ball in place of the third adjuster. The 2-adjuster design improves mount stability by limiting the available degrees of freedom for movement. An SM05-threaded (0.535"-40) bore allows for mounting Ø1/2" optics up to 0.25" (6.4 mm) thick or other SM05-threaded components.
For fitting into tight spaces, the POLARIS-K05T1 mount is equipped with low-profile hex adjusters that are 0.15" (3.8 mm) shorter than the adjusters on the POLARIS-K05T2; due to the shorter adjusters, the POLARIS-K05T1 does not include lock nuts. The hex actuators are compatible with 5/64" (2 mm) hex keys and may be adjusted with our HKTS-5/64 Hex Key Thumbscrew (sold below) or any other 5/64" (2 mm) hex wrench.
The POLARIS-K05T2 mount has standard-profile hex adjusters and includes two adjuster lock nuts that can be tightened by holding the adjuster with a 5/64" (2 mm) hex key while tightening the lock nut by hand or with a 6 mm open-ended wrench. For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 24 oz-in, which can be achieved by using our TW6 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (POLARIS-SM05RR) can also be purchased separately. Post mounting is provided by two #8 (M4) counterbores. Due to the shallow design of the counterbores, low-profile 8-32 and M4 cap screws are included for mounting without obstructing the transmissive beam path. The 8-32 cap screw accepts a 5/64" (2 mm) hex wrench, while the M4 cap screw accepts a 2.5 mm hex wrench. For custom mounting configurations, Ø2 mm alignment pin holes are located on both sides of each counterbore for setting a precise location and mounting angle. Standard DIN 7-m6 ground dowel pins are recommended; see the Docs icon () below for details.
a. Please note that these mounts are designed for Ø1/2" Optics and are not intended for use with the Ø12.5 mm metric mirror size.
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Polaris mounts have two Ø2 mm dowel pin holes by each #8 (M4) counterbore for alignment.
- 3-Adjuster Knob- or Hex-Driven Design with 100 TPI Matched Actuator/Body Pairs
- Designed for use with Ø1" Opticsa up to 0.34" (8.6 mm) Thick or SM1-Threaded (1.035"-40) Components
- ±4° Mechanical Angular Range with ~7.7 mrad/rev Resolution
- Less than 1 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
The POLARIS-K1T and POLARIS-K1T3 Kinematic Mirror Mounts feature an SM1-threaded (1.035"-40) bore for mounting Ø1" optics up to 8.6 mm (0.34") thick or other products (see the photo to the far right). The three-adjuster design provides tip and tilt plus Z-axis (optical axis) adjustment. Two-adjuster versions are also available below.
The POLARIS-K1T includes three removable Ø0.60" (Ø15.2 mm) adjuster knobs, while the POLARIS-K1T3 is a hex-driven model. The adjusters on both mounts can be driven by a 5/64" (2 mm) hex key or the HKTS-5/64 hex key thumbscrew (sold below), and can be locked using our POLARIS-LN1 lock nut or POLARIS-LNS1 locking collar (sold separately below). For applications that require frequent tuning of the adjusters, the lock nut or locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (POLARIS-SM1RR) can also be purchased separately. Post mounting is provided by two #8 (M4) counterbores which can be used with the included 8-32 and M4 cap screws. For custom mounting configurations, Ø2 mm alignment pin holes are located on both sides of each counterbore for setting a precise location and mounting angle (see photo above). Standard DIN 7-m6 ground dowel pins are recommended; see the mechanical drawing for details by clicking on the Docs icon () below.
a. Please note that these mounts are designed for Ø1" Optics and are not intended for use with the Ø25 mm metric mirror size.
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POLARIS-K1T2 2-Adjuster Hex-Driven Mount
- 2-Adjuster Knob- or Hex-Driven Design with 100 TPI Matched Actuator/Body Pairs
- Designed for use with Ø1" Opticsa up to 0.34" (8.6 mm) Thick or SM1-Threaded (1.035"-40) Components
- ±4° Mechanical Angular Range with ~7.7 mrad/rev Resolution
- Less than 1 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
These 2-adjuster Ø1" Polaris Kinematic Mirror Mounts are similar to the standard 3-adjuster versions sold above but feature a hardened steel ball in place of the third adjuster. The 2-adjuster design improves mount stability by limiting the available degrees of freedom for movement. An SM1-threaded (1.035"-40) bore allows for mounting Ø1" optics up to 8.6 mm (0.34") thick or other SM1-threaded components.
The POLARIS-K1T1 includes two removable Ø0.60" (Ø15.2 mm) adjuster knobs, while the POLARIS-K1T2 is a hex-driven model. The adjusters on both mounts can be driven by a 5/64" (2 mm) hex key or the HKTS-5/64 hex key thumbscrew (sold below), and can be locked using our POLARIS-LN1 lock nut or POLARIS-LNS1 locking collar (sold separately below). For applications that require frequent tuning of the adjusters, the lock nut or locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (POLARIS-SM1RR) can also be purchased separately. Post mounting is provided by two #8 (M4) counterbores which can be used with the included 8-32 and M4 cap screws. For custom mounting configurations, Ø2 mm alignment pin holes are located on both sides of each counterbore for setting a precise location and mounting angle (see photo above, to the right). Standard DIN 7-m6 ground dowel pins are recommended; see the Docs icon () below for details.
a. Please note that these mounts are designed for Ø1" Optics and are not intended for use with the Ø25 mm metric mirror size.
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POLARIS-K2T Holding a BB2-E03 Broadband Dielectric Mirror and Mounted on a Ø1" Pillar Post Secured by a POLARIS-CA1 Clamping Arm
- 3-Adjuster Knob- or Hex-Driven Design with 100 TPI Matched Actuator/Body Pairs
- Designed for use with Ø2" Opticsa up to 0.50" (12.7 mm) Thick or SM2-Threaded (2.035"-40) Components
- ±3.4° Mechanical Angular Range with ~5 mrad/rev Resolution
- Less than 2 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
- Mounts with Stiffer Springs for Increased Stabilityb are Available by Contacting Tech Support
The POLARIS-K2T and POLARIS-K2T3 Kinematic Mirror Mounts feature an SM2-threaded (2.035"-40) bore for mounting Ø2" optics up to 12.7 mm (0.50") thick or other products (see the photo to the right). The three-adjuster design provides tip and tilt plus Z-axis (optical axis) adjustment. Two-adjuster versions are also available below.
The POLARIS-K2T includes three removable Ø0.60" (Ø15.2 mm) adjuster knobs, while the POLARIS-K2T3 is a hex-driven model. The adjusters on both mounts can be driven by a 5/64" (2 mm) hex key or the HKTS-5/64 hex key thumbscrew (sold below), and can be locked using our POLARIS-LN1 lock nut or POLARIS-LNS1 locking collar (sold separately below). For applications that require frequent tuning of the adjusters, the lock nut or locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (POLARIS-SM2RR) can also be purchased separately. Post mounting is provided by four #8 (M4) counterbores which can be used with the included 8-32 and M4 cap screws. For custom mounting configurations, Ø2 mm alignment pin holes are located on each mounting face for setting a precise location and mounting angle. Standard DIN 7-m6 ground dowel pins are recommended; see the Docs icon () below for details.
a. Please note that these mounts are designed for Ø2" Optics and are not intended for use with the Ø50 mm metric mirror size.
b. Stiffer springs increase the torque required for angular adjustments.
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POLARIS-K2T2 2-Adjuster Hex-Driven Mount
- 2-Adjuster Knob- or Hex-Driven Design with 100 TPI Matched Actuator/Body Pairs
- Designed for use with Ø2" Opticsa up to 0.50" (12.7 mm) Thick or SM2-Threaded (2.035"-40) Components
- ±3.4° Mechanical Angular Range with ~5 mrad/rev Resolution
- Less than 2 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
- Mounts with Stiffer Springs for Increased Stabilityb are Available by Contacting Tech Support
These 2-adjuster Ø2" Polaris Kinematic Mirror Mounts are similar to the standard 3-adjuster versions sold above but feature a hardened steel ball in place of the third adjuster. The 2-adjuster design improves mount stability by limiting the available degrees of freedom for movement. An SM2-threaded (2.035"-40) bore allows for mounting Ø2" optics up to 12.7 mm (0.50") thick or other SM2-threaded components.
The POLARIS-K2T1 includes two removable Ø0.60" (Ø15.2 mm) adjuster knobs, while the POLARIS-K2T2 is a hex-driven model. The adjusters on both mounts can be driven by a 5/64" (2 mm) hex key or the HKTS-5/64 hex key thumbscrew (sold below), and can be locked using our POLARIS-LN1 lock nut or POLARIS-LNS1 locking collar (sold separately below). For applications that require frequent tuning of the adjusters, the lock nut or locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (POLARIS-SM2RR) can also be purchased separately. Post mounting is provided by four #8 (M4) counterbores which can be used with the included 8-32 and M4 cap screws. For custom mounting configurations, Ø2 mm alignment pin holes are located on each mounting face for setting a precise location and mounting angle. Standard DIN 7-m6 ground dowel pins are recommended; see the Docs icon () below for details.
a. Please note that these mounts are designed for Ø2" Optics and are not intended for use with the Ø50 mm metric mirror size.
b. Stiffer springs increase the torque required for angular adjustments.
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F25USK2 Knob Shown Attached to a POLARIS-K1 Mirror Mount
- Ø0.925" Knob for Additional Angular Resolution
- Clearance Hole Allows Access to Hex Socket of the Adjuster
This removable adjustment knob is compatible with many of our 1/4"-100 adjusters, including those used in the Ø1" and Ø2" Polaris Kinematic Mounts and our Polaris Kinematic Platform Mount. The larger Ø0.925" size provides additional angular resolution over the standard Polaris knobs.
Please note that the F25USK2 knob is not compatible with Polaris mounts that use side-hole adjusters. The recessed bore of knob is not deep enough to allow the knob to engage the threads on the side-hole adjuster.
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- For Convenient Adjustment of 5/64" and 2 mm Hex-Driven Actuators
- Red Anodized Adjustment Knob with Engraved Hex Size
- Replaceable Hex Tip
- Sold in Packages of 4
These 5/64" Hex Key Adjuster Thumbscrews allow for quick adjustment of many 5/64" and 2 mm hex-driven actuators (or standard actuators with the knobs removed). These temporary knobs can be left in the screw's hex socket between adjustments for convenience (see photo to the right). An 8-32 setscrew (5/64" hex) secures the replaceable hex bit, which can be reversed if the tip is stripped. Contact Tech Support to order replacement hex key bits.
We offer hex key thumbscrews in sizes from 0.050" to 3/16" and 2 mm to 5 mm.
ZoomTo install a lock nut without cross threading, gently place the lock nut against the end of the adjuster. "Unscrew" the nut until the threads of the nut and the adjuster align before threading the nut onto the adjuster. This animation shows the installation of a POLARIS-LN1 lock nut on a POLARIS-K1F1 low distortion mount.
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POLARIS-LN05 Lock Nuts on a POLARIS-K19S4 Mount
- Provide Long Term Adjuster Stability
- Compatible with Select Polaris Mounts
- POLARIS-LN05 Lock Nut has 3/16"-130 Internal Threading
- POLARIS-LN1 Lock Nut has 1/4"-100 Internal Threading
These lock nuts are designed for use with Polaris kinematic mounts that do not use low-profile adjusters. The POLARIS-LN05 lock nut can be used with 3/16"-130 adjusters, while the POLARIS-LN1 lock nut is for 1/4"-100 adjusters. Designed for long-term adjuster stability or applications that are exposed to shock and vibration, these lock nuts are pre-greased with the same ultra-high-vacuum-compatible, low-outgassing PTFE grease as the Polaris mounts and have been tested for adjuster fit.
For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened by hand to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). If long term stability is required, the torque wrenches below can be used to apply the appropriate amount of torque to each lock nut (see the table below for torque values). POLARIS-LN05 lock nuts require a 6 mm hex tool for tightening, while POLARIS-LN1 lock nuts require a 13 mm hex tool. To avoid cross threading the lock nut, place it against the adjuster and "unscrew" the lock nut until you feel a slight drop; then thread the lock nut onto the adjuster.
Zoom- Provides Long Term Adjuster Stability
- Compatible with Select Polaris Mounts
- Low Profile: Ø0.33" (Ø8.4 mm) x 0.08" (1.9 mm) Thick
- Tighten Along Rotational Axis Using the POLARIS-T2 Spanner Wrench
This locking collar is compatible with Polaris mounts that have 1/4"-100 adjusters, excluding the piezo-driven mounts and mounts with low-profile adjusters (Item #s POLARIS-K1-H and POLARIS-K1-2AH). Designed for long-term adjuster stability or applications that are exposed to shock and vibration, these locking collars are pre-greased with the same ultra-high-vacuum-compatible, low-outgassing PTFE grease as the Polaris mounts and have been tested for adjuster fit.
The POLARIS-T2 spanner wrench has been specifically designed for use in securing the POLARIS-LNS1 locking collar. The double spanner head enables complete engagement while the design allows locking collar adjustments to be along the same line as the adjuster itself. A center through hole allows a 2 mm ball driver to pass through the spanner wrench, so that the adjuster can be held in position while the locking collar is engaged.
For applications that require frequent tuning of the adjusters, the locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below) in combination with the POLARIS-T2 spanner wrench. To avoid cross threading the locking collar, place it against the adjuster and "unscrew" the collar until you feel a slight drop; then thread the collar onto the adjuster.
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TW6 Torque Wrench Used to Secure POLARIS-LN05 Lock Nut on POLARIS-K05T2 Mirror Mount
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Each wrench is engraved with its preset torque value and item #.
- Preset Wrenches for Polaris Lock Nuts:
- TW6: 24 oz-in for POLARIS-LN05 Lock Nut
- TW13: 32 oz-in for POLARIS-LN1 Lock Nut and POLARIS-T2 Spanner Wrench, as well as POLARIS-LN4 Lock Nut
- Break-Over Design Ensures Proper Torque is Applied
- Ideal for Applications Requiring Long-Term Locking
- Hex Size: 6 mm or 13 mm
These torque wrenches have a preset torque value to secure the lock nuts on Polaris mounts for long-term locking; see the table below for specifications. When the preset torque value has been achieved, the break-over design will cause the pivoting joint to "break," as shown to the right. The wrench's hex head will move back into place once the force is removed. This design prevents further force from being applied to the lock nut. Engraved guidelines indicate the angle the wrench should pivot in order to apply the specified torque; pivoting the handle past these guidelines will over-torque the lock nut. Each wrench is also engraved with its preset torque value, torque direction, wrench size, and item # for easy identification in the field.
These wrenches are designed to be compatible with cleanroom and vacuum chamber applications. They are chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, they are assembled in a clean environment and double vacuum bagged to eliminate contamination when transported into a cleanroom. Every wrench has a bead blasted finish to minimize reflections when working with setups that include lasers.
Please note that these wrenches are not intended for use in applications where adjusters are frequently tuned, as these applications typically require torque values of 4 to 8 oz-in (0.03 to 0.06 N·m).
| Item # | Torque | Torque Accuracy | Hex | Compatible Item #s |
|---|---|---|---|---|
| TW6 | 24 oz-in (0.17 N•m) | ±1.44 oz-in (0.010 N•m) | 6 mm | POLARIS-LN05 |
| TW13 | 32 oz-in (0.23 N•m) | ±1.92 oz-in (0.014 N•m) | 13 mm | POLARIS-LN1, POLARIS-T2, POLARIS-LN4 |
SM-Threaded Polaris Mirror Mounts