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Hex Adjusters, M2.5 x 0.20 Extremely Fine


  • Extremely Fine Adjustment
  • 200 µm Travel Per Revolution

LN25M20

F2D5ESN1P

F2D5ES8

F2D5ES12

F2D5ES20

1.5 mm
Hex Socket

F2D5ESK1

F10SC1-5

F2D5ESK1L

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Features

  • Hex Adjusters Feature a 1.5 mm Hex Socket
  • Removable Adjustment Knobs Allow for Adjustment Without a Hex Key
  • Threaded Bushing, Lock Nut, and Locking Collar are Offered for Threading Integration

These M2.5 x 0.20 hex adjusters come lubricated for smooth mating with compatible components. The adjuster body is constructed of 303 stainless steel and the ball tip is constructed using 440 stainless steel that is fixed onto the adjuster using epoxy. The M2.5 x 0.20 threaded sleeve is manufactured on a super-precision CNC turning center using a single point threading tool. Removable adjustment knobs provide a way to make fine adjustment without the need of a hex key for the adjusters. Other M2.5 x 0.20 threaded components such as a threaded bushing and lock nuts are offered to simplify the integration of fine adjusters in your application. For detailed instructions on installing bushings, please see the Integration tab.

Threaded Bushing Application

Integrating Fine Adjustment Screws Into Optomechanical Systems

The assembly process begins by producing the appropriately sized mating hole for the threaded bushing. Given the close fit between the threaded bushing and the mating adjuster screw, we caution against using a press fit to assemble these products. For our own production needs, we use a permanent anaerobic adhesive that provides excellent long-term performance.

We recommend using Loctite Anaerobic Adhesive product number 680 or equivalent. In order to ensure maximum strength between the bonded parts, we strongly urge the user to follow carefully the instructions provided by Loctite, which specify the amount of clearance between the threaded bushing and the mounting plate. The most common source of failure is not allowing for the proper clearance between the parts being bonded since this clearance provides for the proper volume of adhesive.

When assembling, apply a small amount of the Loctite adhesive to the threaded bushing only. Rotate the bushing as it is installed to ensure a uniform distribution of the adhesive. After insertion, remove any excess adhesive from around the part.

As shown in the figure to the right, the flange on the mating bushing is designed to support the axial load of the screw and bushing assembly.

Volume Pricing Discount
Contact Thorlabs

OEM & Custom Precision Screws

Thorlabs manufactures custom and high volume OEM precision screws and bushings with various diameters, lengths, and threads. To inquire about custom or OEM precision screws, please contact Technical Support or use the "Contact Us" form to the right. A specialist will contact you within 24 hours or the next business day.

Precision Screw Capabilities

Thorlabs' in-house machine shop, located in Newton, NJ, gives us the ability to quickly produce large quantities of precision screws and bushings. We are equipped to manufacture screw diameters ranging from 2.5 mm to 20 mm with lengths up to 165 mm and a maximum thread pitch of 200 TPI. Our standard adjuster screw design has a hardened steel ball tip to provide a single point of contact; for other applications we are able to provide adjusters without the steel ball. Custom orders can be achieved on a case-by-case basis. For large orders of an item, Thorlabs passes on to the customer the cost savings associated with planned production of high volumes of that item. For more information on Thorlabs' discount pricing policy, click the "V" link to the right. We also offer a large variety of stock precision screws, which are available here.

Fast Turn-Around Times
Our experienced, highly skilled machinists are running our on-site Citizen Swiss Screw Machines 24 hours a day, allowing us to produce high-volume custom and OEM orders. Each machine is capable of running unattended, producing one screw every 30 to 120 seconds. This flexibility allows us to fulfill multiple orders at once without sacrificing quality.

High Quality
Thorlabs inspects all of our fabricated precision screws and bushings after the initial fabrication process and right before packaging. All inspections adhere to the ANSI AQL1.5 acceptable quality level, which states that if a certain percentage, based upon the amount of product in a certain lot, does not meet specification, then the entire lot is not sold. This ensures that all customers receive the highest quality product every time and that all items will be of equal performance.

Precision Screw Production


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M2.5 x 0.20 Extremely Fine Hex Adjusters

  • Five Lengths Available from 8 to 20 mm
  • 1.5 mm Hex Key Compatible
  • Max Load: 4.5 kg (10 lbs)

Our high precision M2.5 x 0.20 hex adjusters can be adjusted with a 1.5 mm hex key or M2.5 x 0.20 removable adjustment knob. While one end of each adjuster features a hex socket, the other end has a spherical tip, providing one point of contact for the adjuster. To maintain smooth adjustment, the maximum load of these adjusters is 4.5 kg (10 lbs).

These adjuster screws are designed to be used with M2.5 x 0.20 threaded bushings, available below. Alternatively, for more compact applications, an M2.5 x 0.20 plug tap can create M2.5 x 0.20 tapped holes in optomechanical components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
F2D5ES8 Support Documentation
F2D5ES8Extremely Fine Hex Adjuster, M2.5 x 0.20, 8 mm Long
$7.60
Today
F2D5ES10 Support Documentation
F2D5ES10Extremely Fine Hex Adjuster, M2.5 x 0.20, 10 mm Long
$9.18
Today
F2D5ES12 Support Documentation
F2D5ES12Extremely Fine Hex Adjuster, M2.5 x 0.20, 12 mm Long
$9.79
Today
F2D5ES15 Support Documentation
F2D5ES15Extremely Fine Hex Adjuster, M2.5 x 0.20, 15 mm Long
$10.30
Today
F2D5ES20 Support Documentation
F2D5ES20Extremely Fine Hex Adjuster, M2.5 x 0.20, 20 mm Long
$11.22
Today

M2.5 x 0.20 Removable Adjustment Knobs

  • Use with M2.5 x 0.20 Hex Adjusters
  • Clearance Hole Allows Access to Adjuster's Hex Socket
  • Available in 2 Sizes
  • Knurled Knob Increases Adjustment Sensitivity

The F2D5ESK1 and F2D5ESK1L Removable Adjustment Knobs thread onto our M2.5 x 0.20 F2D5ES series hex adjusters to allow adjustment without the use of a hex key. This provides quick and easy adjustments for a broad range of applications. The adjuster knobs are available in two sizes: standard (Ø7.1 mm) and large (Ø14.7 mm).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
F2D5ESK1 Support Documentation
F2D5ESK1M2.5 x 0.20 Removable Adjuster Knob
$9.14
Today
F2D5ESK1L Support Documentation
F2D5ESK1LLarge-Diameter M2.5 x 0.20 Removable Adjuster Knob
$8.22
Today

M2.5 x 0.20 Threaded Bushing

  • Ideal for Slip Fit
  • Material: 510 Phosphor Bronze (Vacuum Rated for 10-6 Torr)
  • Recommended Bore Diameter: 4.01 mm +0.03 mm/-0.00 mm

Our M2.5 x 0.20 Threaded Bushings are commonly used in slip fit applications where fine adjusters are needed. Due to the tolerances of our fine adjusters, we strongly discourage press fitting these bushings. The recommended bore diameter for our M2.5 x 0.20 bushings is 4.01 mm +0.03 mm/-0.00 mm. For vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates prior to use. To learn more about the use of fine adjustment screws and bushings in optomechanical systems, please see the Integration tab above.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
F2D5ESN1P Support Documentation
F2D5ESN1PThreaded Bushing, Phosphor Bronze, M2.5 x 0.20
$4.08
Today

M2.5 x 0.20 Lock Nut

  • Knurled Outside Diameter for Easy Tightening
  • Material: 510 Phosphor Bronze
  • Vacuum Compatible: 10-6 Torr

The LN25M20 lock nut features a knurled outside diameter to make gripping the nut easier when loosening or tightening. The lock nut is made from 510 Phosphor Bronze, which is vacuum rated for 10-6 Torr. Each nut features blind holes that allow a hex key to be used to help tighten the lock nut.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
LN25M20 Support Documentation
LN25M20M2.5 x 0.20 Lock Nut
$8.65
Today

M2.5 x 0.20 Locking Collar

Stop Collar Jam Nut
Click to Enlarge

Two Collars Can be Locked Together to Create a Hard Stop
Stop Collar Lock Nut
Click to Enlarge

A Single Locking Collar Can Lock an Adjuster in Position
  • Extremely Compact Lock Nut: 0.07" (1.7 mm) Thick
  • Use One Collar To Lock an Adjuster to a Bushing
  • Use Two Collars to Create a Hard Stop on an Adjuster
  • Sold in Packages of Five
  • Install and Remove with the SPW403 Spanner Wrench

These locking collars are compact alternatives to the lock nuts sold above. They are only 0.07" (1.7 mm) thick and are constructed of 303 stainless steel. They are compatible with all of the M2.5 x 0.20 adjusters sold on this page, as well as those used in our FiberBench and Post-Mountable Kinematic Tip/Tilt and Rotation Mounts.

As shown in the photos to the right, they can be used to lock an adjuster in a desired position, or to create a hard stop at any position to prevent overdriving an adjuster. In addition to using two collars to create a hard stop, as shown in the photo to the far right, a single collar can be epoxied to an adjuster using our G14250 epoxy to create a permanent hard stop. We recommend the SPW403 Spanner Wrench to install or remove these locking collars. The end of the SPW403 is machined to accept a 5/64" hex wrench, which can be used to provide additional torque. The hollow cylindrical construction of the SPW403 allows a tool to pass through the entire length of the spanner wrench and access the adjuster.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
F10SC1-5 Support Documentation
F10SC1-5Locking Collar for M2.5 x 0.20 Adjusters, 5 Pack
$28.11
Today
SPW403 Support Documentation
SPW403Spanner Wrench for FiberPort Zθ Locking Collars and F10SC1-5 M2.5 x 0.20 Locking Collars
$26.27
Today
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