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Post Holder Bases


  • Compatible with Imperial or Metric Posts and Post Holders
  • Available with Imperial or Metric Footprint
  • Bottom Relief Cuts Ensure Stable Mounting

BA1V

Vacuum Compatible

BA2

BA1S

BA3

BA2F

Flexure Clamping Mechanism

BA2T2

Adjustable Base

Magnetic and Vacuum-Compatible Versions of the BA1, BA1S, and BA2 are Available

BA2R

Magnetic Base
(Underside Shown)

Related Items

BA2 Base Plate Application
Click to Enlarge

Components Mounted on BA2 Bases
PH1-ST Fastening To BA2 Base Plate
Post Holder and Base Assembly

Features

  • Ideal for Mounting and Positioning Our Ø1/2" Post Holders
  • Machined Bottom Relief Cuts Ensure Stability
  • Vacuum-Compatible and Magnetic Versions of Popular Bases Available
  • Imperial and Metric Footprints Available

The post holder bases found on this page have a universal design that allows them to be used with imperial or metric post holders. However, it is best to use a metric base with a metric optical breadboard and an imperial base with an imperial breadboard. By matching metric with metric and imperial with imperial, the bases can be positioned flush against each other without leaving unused rows of holes, as shown in the image to the right. For more information on the differences between Thorlabs' imperial and metric components, please see our imperial vs. metric tutorial.

Standard Bases
These bases are most commonly used for positioning and fastening our Ø1/2" post holders to optical tables. Post holders are attached via 1/4"-20 (M6) cap screws placed through the bottom-located counterbores in the base, as shown in the schematic to the lower right. All bases are machined parallel and perpendicular to within 0.002" (0.05 mm) and contain bottom relief cuts that enhance stability.

Vacuum-Compatible Bases
These versions of our popular standard bases have a chemically cleaned finish instead of the standard black anodization. This allows them to be used directly out of the packaging at pressures as low as 10-6 Torr, or at even lower pressures with additional cleaning and processing. To complement these bases, we offer a complete vacuum-compatible Ø1/2" post system, as well as a selection of vacuum-compatible components.

Magnetic Bases
When working on a magnetic optical table, the bottom-located magnets in our BA1R(/M), BA1SR(/M), and BA2R(/M) bases provide the ability to temporarily secure components during the setup process. The magnets in these bases are strong enough to help prevent accidental movement of components, while still allowing for easy repositioning. Once positioning is complete, these bases must be screwed down to be permanently secured to the table.

Adjustable Bases
The BA2T2(/M) Adjustable Base complements our popular line of standard bases. Designed for greater flexibility, this base features three long slots and two 1/4"-20 (M6) counterbored holes. A 1/4"-20 (M6) threaded stud (included) can slide along the central slot for coarse alignment adjustments. This base is ideal for use with our Ø1/2" post holders.

Flexure Bases
The BA2E(/M) and BA2F(/M) Flexure Mounting Bases feature a double bore for mounting Ø1/2" (Ø12.7 mm) posts or Ø1/2" post holders and Ø1" (Ø25.0 mm) posts, respectively, with a non-marring flexure clamping mechanism. In addition to providing rotational and some height adjustment, these bases also allow a post to be mounted in direct contact to the optical table surface because of the double bore through the part. With standard bases, such as the BA2, the post is mounted on top of the base directly or within a post holder, as shown in the image to the right. This method will inherently increase the minimum height of the optical axis. The double bore flexure design mounts optical components within the base to provide more stability and allow the components to be closer to the optical table surface. It also removes the need to use intermediary parts, such as a post holder, when mounting a post.


Click to Enlarge

UBP2 Universal Base Plate

In addition to the advantages stated above, using these bases to directly mount a post will also remove the issue of table flexing, or bridging, that is commonly seen when using standard clamping forks. Please click here for more information on the detrimental effects of table flexing.

Universal Base Plate
The UBP2(/M) Universal Base Plate increases the flexibility of any optical setup by providing mounting holes in virtually any orientation on an optical table or breadboard. This freedom allows users to mount various components or stages in a wide array of orientations outside of what is dictated by the standard 1" (25.0 mm) hole pattern.

Swivel Base Adapter
Our 360° swivel base adapter fits all standard Ø1/2" post holders with 1/4"-20 (M6) mounting holes. The swivel design is ideal for applications that require a large number of components to be packed into a small area. Additionally, the swivel base will decrease the time required to assemble an optical system.

Image
(Click to Enlarge)
Description
BE1 Photo
BE1
Base Adapter for Ø1/2" Post Holders and Ø1" Posts
The BE1 Pedestal Base Adapter features a 1/4"-20 (M6)-threaded stud which fits into the bottom of our standard Ø1/2" post holders or Ø1" post extensions to convert them into pedestal-style mounts. Made from solid 303 stainless steel with a 1.25" (31.8 mm) outer diameter, this adapter allows these posts to be used with our CF125 and CF175 clamping forks.
RS05PC Photo
RS05PC
Ø1" Ceramic Pedestal Pillar Post
The RS05PC Ceramic Pedestal Post is designed to provide high levels of thermal and electrical isolation. It is ideal for mounting components that may be sensitive to heat or sources of electrical noise. This adapter is compatible with our CF125 and CF175 clamping forks.
CF125 photo
CF125
Small Clamping Fork
The CF125 Clamping Fork was designed with positional flexibility in mind. This clamping fork is directly compatible with our Pedestal Style Post Holders and RSP-Series Ø1" Pedestal Pillar Posts. The solid steel construction, complete with carefully placed relief cuts and landing pads, provides exceptional clamping stability. The counterbored slot is 1.25" (32 mm) in length, is designed to accept a 1/4"-20 (M6) cap screw and washer, and allows the clamp to swivel about the pedestal base in order to align with the most convenient mounting holes.
CF175 Photo
CF175
Large Clamping Fork
The CF175 Clamping Fork was designed with positional flexibility in mind. This clamping fork is directly compatible with our Pedestal Style Post Holders and RSP-Series Ø1" Pedestal Pillar Posts. The solid steel construction, complete with carefully placed relief cuts and landing pads, provides exceptional clamping stability. The counterbored slot is 1.75" (44.5mm) in length, is designed to accept a 1/4"-20 (M6) cap screw and washer, and allows the clamp to swivel about the pedestal base in order to align with the most convenient mounting holes.
Polaris-CA1 Photo
POLARIS-CA1
Polaris™ Non-Bridging Clamping Arm
The Polaris Clamping Arm is the ideal solution for stably mounting any Ø1" post. Each clamping arm, which is constructed from heat-treated, stress-relieved 303 stainless steel, provides extremely high holding forces with minimal torquing of the mounting screws. The side-located clamping mechanism is actuated using a 1/4"-20 cap screw. Because the side-located clamp and mounting slot are tightened separately, the user can set the position of the fork and adjust the rotational alignment independently. The clamping arm has a compact 3.33" x 1.60" (84.5 mm x 40.6 mm) footprint for tight laser cavity setups, with a thickness of 0.60" (15.2 mm) for increased stability. A 1.30" (33.0 mm) long clearance slot allows for a variety of mounting solutions using a 1/4"-20 or M6 cap screw and washer. This clamping arm is also avaiable with a metric cap screw (POLARIS-CA1/M).
PB4 Photo
PB4
Base Adapter for Ø1" Post Holders and Ø1.5" Posts
The PB4 pedestal base adapter features a 1/4"-20-(M6)-threaded stud which fits into the bottom of our Ø1.5" posts to convert them into pedestal-style mounts. Made from solid 303 stainless steel with a 1.85" (47.0 mm) outer diameter, this adapter allows these posts to be used with our PF175 clamping fork.
PF175 Photo
PF175
P-Series Clamping Fork
The PF175 is specifically designed to turn our Ø1.5" Posts into "Pedestal Style" posts. It has a 2.11" (54 mm) long counterbored slot that is designed to accept a 1/4"-20 (M6) cap screw and washer. The clamp can swivel about the pedestal base in order to align with the most convenient mounting holes.
PB1 Photo
PB1
Mounting Post Base for Ø1.5" Posts
This standard Ø2.48" post base bolts directly onto P-Series posts and adds 0.40" to the height of the post. To mount directly onto an optical bench, four 1/4 (M6) counterbored holes on 2" (50 mm) centers are provided.
PB2 Photo
PB2
Slotted Mounting Post Base for Ø1.5" Posts
This universal Ø2.40" post base allows random placement of a P-Series post on an optical bench. The PB2 attaches to the P-Series posts using the 1/4"-20 (M6) center-tapped hole and adds 0.50" to the height of the post.
KB1X1 Photo
KB1X1
1" x 1" Kinematic Base
This kinematic base consists of two plates: a top mounting plate and a bottom base plate. The two plates measure 1" (25 mm) to a side and are magnetically coupled using two pairs of high strength magnets. The top plate can be removed and replaced, automatically repositioning to an exact location with the repeatability of one microradian. The bottom plate can be fastened using a center-located #8 (M4) counterbore. Both the top (Item# KBT1X1) and bottom (Item# KBB1X1) plates can be purchased separately.
KB3X3 Photo
KB3X3
3" x 3" Kinematic Base
This kinematic base consists of two plates: a top mounting plate and a bottom base plate. The two plates measure 3" (75 mm) to a side and are magnetically coupled using two pairs of high strength magnets. The bottom plate can be fastened to an optical bench using two 1/4"-20 (M6) clearance slots. These mounting slots can be accessed with the top plate in place. Both the top (Item# KBT3X3) and bottom (Item# KBB3X3) plates can be purchased separately.

KBM1
Lockable Kinematic Breaboard (3.94" x 3.94")
This kinematic base consists of two plates: a top mounting plate and a bottom base plate. The two plates measure 3.94" (100 mm) to a side and are magnetically coupled using two pairs of high strength magnets. With a ball and V-groove design, the top plate can be removed and replaced with a lateral repeatability of 30 µm. The high repeatability of the unit allows minimal readjustment of the setup for applications where frequent removal and insertion of components is needed. The top plate has an array of 39 1/4"-20 (M6) tapped holes [0.46" (11.8 mm) deep] spaced 0.5" (12.5 mm) apart and provides the same mounting functionality as an optical breadboard. The bottom plate has two 2.00" (50.0 mm) long counterbored slots for 1/4"-20 (M6) cap screws for mounting to an optical table.
RB2 Photo
RB2
Adjustable Height Post Base
The RB2 has a 0.90" (23 mm) deep base, which allows for maximum height adjustment of the RS Series of pillar posts. The locking screw is located on the top surface of the base, allowing for convenient vertical access.
MB175 Photo
MB175
Magnetic Base
For use with our standard Ø1/2" stainless steel post or our Ø1" post holders, this heavy-duty magnetic base has a switchable magnet for quick positioning of optical components. It provides 175 pounds of holding force. The two bottom mounting surfaces have been precision ground for optical bench applications.
IB3 Photo
IB3
Instrument Base
The IB3 precision-machined aluminum instrument base provides flat, stable mounting and is useful for maneuvering items such as a post-mounted power meter head into and out of the beam path.
PMB3 Photo
PMB3
Permanent Magnetic Base
The PMB3 combines the convenience of our IB3 Base (above) with the benefit of a powerful magnet. The magnet is sufficiently strong to hold the base in place securely without needing to clamp it to an optical table. These bases are ideal for semi-permanent placement of an instrument or optical head.
SB1 Photo
SB1
Switchable Kinematic Base
This compact kinematic base is designed to allow easy removal and exact repositioning of the top plate. An On/Off switch controls the magnetic force that firmly holds the two plates together. Additional top (Item# SB1T) and bottom (Item# SB1B) plates can be purchased separately.
NX1NF Photo
NX1NF
Indexing Mounting Base
This base is ideal for redirecting a laser to multiple targets on your optical table. Applications include precise switching of shared laser systems, directing optical signals to multiple test instruments, and easy exchange of optical components (with extra top mounts). For best performance, ensure that the NX1NF is securely attached to its support structure. A series of three #8-32 (M4-0.7) tapped mounting holes are provided for mounting the bottom plate to a post or breadboard and the top plate has a single 8-32 tap for mounting optical components.
ESK01 Photo
NX1FESK01
Bases and Post Holders Essentials Kit
For those who are just starting out and need a little bit of everything, the ESK01 Bases and Post Holders Essentials Kit contains 130 of the most commonly used post holders, bases, and table clamps, all conveniently housed in a completely labeled cabinet. The large variety of sizes provides the maximum amount of flexibility when breadboarding an optical system. This kit is best used in conjunction with ESK03 Post and Accessories Essentials Kit.
Documents Tab to be Discontinued...
Please note that this tab will be removed at the end of 2015. The same information displayed here can be found by clicking on the red Docs Icon (Support Documentation icon) next to the item of interest in the pricing area below.
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
BA1 Support Documentation BA1:Mounting Base, 1" x 3" x 3/8"
BA1/M Support Documentation BA1/M:Mounting Base, 25 mm x 75 mm x 10 mm
BA1/M-P5 Support Documentation BA1/M-P5:Mounting Base, 25 mm x 75 mm x 10 mm, 5 Pack
BA1L Support Documentation BA1L:Mounting Base, 1" x 4.5" x 3/8"
BA1L/M Support Documentation BA1L/M:Mounting Base, 25 mm x 115 mm x 10 mm
BA1-P5 Support Documentation BA1-P5:Mounting Base, 1" x 3" x 3/8", 5 Pack
BA1R Support Documentation BA1R:Magentic Mounting Base, 1" x 3" x 3/8"
BA1R/M Support Documentation BA1R/M:Magnetic Mounting Base, 25 mm x 75 mm x 10 mm
BA1S Support Documentation BA1S:Mounting Base, 1" x 2.3" x 3/8"
BA1S/M Support Documentation BA1S/M:Mounting Base, 25 mm x 58 mm x 10 mm
BA1S/M-P5 Support Documentation BA1S/M-P5:Mounting Base, 25 mm x 58 mm x 10 mm, 5 Pack
BA1SL Support Documentation BA1SL:Mounting Base, 1" x 3" x 3/8"
BA1SL/M Support Documentation BA1SL/M:Mounting Base, 25 mm x 75 mm x 10 mm
BA1S-P5 Support Documentation BA1S-P5:Mounting Base, 1" x 2.3" x 3/8", 5 Pack
BA1SR Support Documentation BA1SR:Magnetic Mounting Base, 1" x 2.3" x 3/8"
BA1SR/M Support Documentation BA1SR/M:Magnetic Mounting Base, 25 mm x 58 mm x 10 mm
BA1SV Support Documentation BA1SV:Mounting Base, 1" x 2.3" x 3/8", Vacuum Compatible
BA1SV/M Support Documentation BA1SV/M:Mounting Base, 25 mm x 58 mm x 10 mm, Vacuum Compatible
BA1V Support Documentation BA1V:Mounting Base, 1" x 3" x 3/8", Vacuum Compatible
BA1V/M Support Documentation BA1V/M:Mounting Base, 25 mm x 75 mm x 10 mm, Vacuum Compatible
Part NumberProduct Description
BA2 Support Documentation BA2:Mounting Base, 2" x 3" x 3/8"
BA2/M Support Documentation BA2/M:Mounting Base, 50 mm x 75 mm x 10 mm
BA2/M-P5 Support Documentation BA2/M-P5:Mounting Base, 50 mm x 75 mm x 10 mm, 5 Pack
BA2E Support Documentation BA2E:Flexure Clamping Base / Post Mount, Ø1/2" Double Bore, 2.00" x 3.00" x 0.48"
BA2E/M Support Documentation BA2E/M:Flexure Clamping Base / Post Mount, Ø12.8 mm Double Bore, 50.8 mm x 75.0 mm x 12.1 mm
BA2F Support Documentation BA2F:Flexure Clamping Base / Post Mount, Ø1" Double Bore, 2.00" x 3.00" x 0.48"
BA2F/M Support Documentation BA2F/M:Flexure Clamping Base / Post Mount, Ø25.0 mm Double Bore, 50.8 mm x 75.0 mm x 12.1 mm
BA2-P5 Support Documentation BA2-P5:Mounting Base, 2" x 3" x 3/8", 5 Pack
BA2R Support Documentation BA2R:Magnetic Mounting Base, 2" x 3" x 3/8"
BA2R/M Support Documentation BA2R/M:Magnetic Mounting Base, 50 mm x 75 mm x 10 mm
BA2T2 Support Documentation BA2T2:Adjustable Mounting Base, 2" x 3" x 3/8"
BA2T2/M Support Documentation BA2T2/M:Adjustable Mounting Base, 50 mm x 75 mm x 10 mm
BA2V Support Documentation BA2V:Mounting Base, 2" x 3" x 3/8", Vacuum Compatible
BA2V/M Support Documentation BA2V/M:Mounting Base, 50 mm x 75 mm x 10 mm, Vacuum Compatible
BA3 Support Documentation BA3:Mounting Base with Radial Through Slots, 2" x 3" x 3/8"
BA3/M Support Documentation BA3/M:Mounting Base with Radial Through Slots, 50 mm x 75 mm x 10 mm
RSPC Support Documentation RSPC:Pedestal Post Position Retainer
UBP2 Support Documentation UBP2:Universal Base Plate, 2.5" x 2.5" x 3/8"
UBP2/M Support Documentation UBP2/M:Universal Base Plate, 65 mm x 65 mm x 10 mm, Metric
UPHA Support Documentation UPHA:Swivel Base Adapter

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Posted Comments:
Poster:franxm
Posted Date:2013-04-29 15:47:06.363
suggestion: laser etched ruler on bottom edge of BA1S (and BA1SR) along 2.3" length. application: mount with iris to align beam (parallel to table edges) using table holes
Poster:jlow
Posted Date:2013-04-30 12:42:00.0
Response from Jeremy at Thorlabs: Thank you very much for your feedback. We will look into the possibility of adding this to our bases. In the meantime, we should be able to provide you with a custom solution for this. I will get in contact with you directly to discuss about this.
Poster:bdada
Posted Date:2012-02-02 19:02:00.0
Response from Buki at Thorlabs: Thank you for using our product feedback tool. The material used for the BA2T2/M is anodized aluminum, which is non magnetic. We will look into adding more information on our website. Please contact TechSupport@thorlabs.com if you have any questions.
Poster:
Posted Date:2012-02-02 17:16:28.0
Could you tell me what materials are used in these bases? We have an application for which we need non-magnetic parts. Could you suggest another product that allows translational flexibility if these wouldn't work? Thanks.
Poster:bdada
Posted Date:2012-01-23 08:57:00.0
Response from Buki at Thorlabs: Thank you for pointing out the omission of the UPHA swivel base. We have added it to the page.
Poster:
Posted Date:2012-01-22 15:57:20.0
The UPHA swivel base is missing from your page on bases.
Poster:technicalmarketing
Posted Date:2007-11-13 16:12:16.0
In response to acable’s suggestions we have implemented the following changes to this page: (1) We have retaken the photograph of the BA2T2 to show the locking screw in the center slot (2) We have also enlarged the application photo so that the magnets can be more easily viewed (3) We have added an “other bases” tab, which highlights the other base options that Thorlabs offers. In addition, this tab contains links to all of the products so that more information can be found. (4) We have presented the bases in numerical order in the price box (5) We have shuffled the photos in the first subgroup image so that they could be enlarged. (6) We have fixed the broken link under the related products tab. We are still in the process of implementing some of the ideas from your first post (in terms of creating a circle of visibility) but wanted to comment on the current progress. We thank you for your interest in Thorlabs, and your willingness to help us improve our web presentations!
Poster:acable
Posted Date:2007-10-11 09:40:03.0
The BA2T2 photo doesnt show the locking screw that is fixed within the center slot but instead has it in one of the auxillary mounting holes. Also the application photo which is what i used to understand the operation of the part is really small and hard to read, and there seems to be plenty of room to enlarge it. Also please have a look at the old comment from May of 2006, most are still not acted on.

Standard Bases

BA2S7 as Spacer
Click to Enlarge

The height of any component mounted on a BA2(/M) base can be increased in increments from 0.010" (0.25 mm) to 2" (50 mm)
using a mounting base spacer.
BA2S7 as Spacer
Click to Enlarge

Post Holder with Lens Mounted on BA1L Base
  • Compatible with Imperial and Metric Breadboards, Posts, and Post Holders
  • Attach to Post Holders via Bottom-Located 1/4"-20 (M6) Counterbored Mounting Hole(s)
  • Mount on Breadboard or Optical Table via Clearance Slot(s) for 1/4"-20 (M6) Cap Screws
  • Fabricated from Black Anodized Aluminum with Bottom Relief Cuts for Stable Mounting
  • Our Most Popular Bases are Also Available in Packs of 5

Thorlabs offers a variety of standard anodized aluminum bases to best utilize space on an optical breadboard. For close positioning of components, our BA1S(/M) base features the smallest footprint, while the BA1SL(/M) base offers a longer slot length for flexibility. For increased stability while maintaining a small footprint, the two-slotted BA1(/M) is a good option. For the greatest stability, consider either our BA2(/M) or BA3(/M) base, which offer a larger contact area. The BA2(/M) features two straight slots, while the BA3(/M) has two radial slots for ±45° of manual rotation. As our longest standard base, the BA1L(/M) provides 1.44" (36.6 mm) of lateral positioning and can be secured to an optical breadboard by two screws, even when oriented at varying angles with respect to the tapped hole pattern (see photo to the right).

Please note that a 3/8" long, 1/4"-20 (10 mm long M6) cap screw is recommended for attaching post holders to our standard mounting bases.

To reduce packaging waste, we offer our most popular sizes in packs of five.

Item #BA1S(/M)BA1SL(/M)BA1(/M)BA1L(/M)BA2(/M)BA3(/M)
Click Image
to Enlarge
BA1S BA1SL BA1 BA1L BA2 BA3
Slots 1 1 2 2 2 2
Slot Type Straight Straight Straight Straight Straight Radial
Slot Length 1.10" (27.9 mm) 1.80" (44.5 mm) 0.81" (20.1 mm) 1.56" (39.6 mm) 1.25" (31.8 mm) π × 1/2" (π × 12.5 mm)
Arc Lengtha
Mounting Holes 1 1 1 1 3 3
Dimensions
(W x L x H)
1" x 2.3" x 3/8"
(25 x 58 x 10 mm)
1" x 3" x 3/8"
(25 x 75 x 10 mm)
1" x 3" x 3/8"
(25 x 75 x 10 mm)
1" x 4.5" x 3/8"
(25 x 115 x 10 mm)
2" x 3" x 3/8"
(50 x 75 x 10 mm)
2" x 3" x 3/8"
(50 x 75 x 10 mm)
  • ±45° of Manual Rotation
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
BA1S Support Documentation
BA1SMounting Base, 1" x 2.3" x 3/8"
$5.20
Today
BA1S-P5 Support Documentation
BA1S-P5Mounting Base, 1" x 2.3" x 3/8", 5 Pack
$23.40
Today
BA1SL Support Documentation
BA1SLMounting Base, 1" x 3" x 3/8"
$15.00
Today
BA1 Support Documentation
BA1Mounting Base, 1" x 3" x 3/8"
$5.60
Today
BA1-P5 Support Documentation
BA1-P5Mounting Base, 1" x 3" x 3/8", 5 Pack
$25.20
Today
BA1L Support Documentation
BA1LMounting Base, 1" x 4.5" x 3/8"
$12.00
Today
BA2 Support Documentation
BA2Mounting Base, 2" x 3" x 3/8"
$7.30
Today
BA2-P5 Support Documentation
BA2-P5Mounting Base, 2" x 3" x 3/8", 5 Pack
$32.85
Today
BA3 Support Documentation
BA3Mounting Base with Radial Through Slots, 2" x 3" x 3/8"
$9.50
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
BA1S/M Support Documentation
BA1S/MCustomer Inspired!Mounting Base, 25 mm x 58 mm x 10 mm
$5.20
Today
BA1S/M-P5 Support Documentation
BA1S/M-P5Mounting Base, 25 mm x 58 mm x 10 mm, 5 Pack
$23.40
Today
BA1SL/M Support Documentation
BA1SL/MMounting Base, 25 mm x 75 mm x 10 mm
$15.00
Today
BA1/M Support Documentation
BA1/MCustomer Inspired!Mounting Base, 25 mm x 75 mm x 10 mm
$5.60
Today
BA1/M-P5 Support Documentation
BA1/M-P5Mounting Base, 25 mm x 75 mm x 10 mm, 5 Pack
$25.20
Today
BA1L/M Support Documentation
BA1L/MMounting Base, 25 mm x 115 mm x 10 mm
$12.00
Today
BA2/M Support Documentation
BA2/MCustomer Inspired!Mounting Base, 50 mm x 75 mm x 10 mm
$7.30
Today
BA2/M-P5 Support Documentation
BA2/M-P5Mounting Base, 50 mm x 75 mm x 10 mm, 5 Pack
$32.85
Today
BA3/M Support Documentation
BA3/MCustomer Inspired!Mounting Base with Radial Through Slots, 50 mm x 75 mm x 10 mm
$9.50
Today

Vacuum-Compatible Bases

Item #BA1SV(/M)BA1V(/M)BA2V(/M)
Click Image to Enlarge BA1SV BA1V BA2V
Slots 1 2 2
Slot Type Straight Straight Straight
Slot Length 1.10" (27.9 mm) 0.81" (20.1 mm) 1.25" (31.8 mm)
Mounting Holes 1 1 3
Dimensions (W x L x H) 1" x 2.3" x 3/8"
(25 mm x 58 mm x 10 mm)
1" x 3" x 3/8"
(25 mm x 75 mm x 10 mm)
2" x 3" x 3/8"
(50 mm x 75 mm x 10 mm)
Vacuum Compatibility >10-6 Torra
Material 6061-T6 Aluminum
Outgassing Rate at 20 °C  7.6 x 10-9 Torr-Liters/s/cm2
Packaging Double Vacuum Bagged
  • This is the pressure at which these components can be used directly out of the packaging with no additional processing. They can be used at even lower pressures with additional cleaning and processing.
  • Vacuum-Compatible Design (>10-6 Torr)
  • Double Vacuum Bagged for Cleanroom Environments
  • Same Stability and Footprint as Our Standard Mounting Bases Sold Above

These vacuum-compatible bases are constructed from 6061-T6 aluminum and are chemically cleaned and prepared for vacuum applications before packaging. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the aluminum, which is 7.6 x 10-9 Torr-Liters/s/cm2 at 20 °C. The material properties of the 6061-T6 aluminum and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr.

These bases are packaged in double airtight bags for cleanroom and vacuum chamber applications. A 3/8" (10 mm) long 1/4"-20 (M6) vented cap screw (SH25S038V or SH6MS10V, respectively) is recommended for attaching post holders to our mounting bases. We also offer additional vacuum-compatible Ø1/2" post system components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
BA1SV Support Documentation
BA1SVMounting Base, 1" x 2.3" x 3/8", Vacuum Compatible
$12.25
Today
BA1V Support Documentation
BA1VMounting Base, 1" x 3" x 3/8", Vacuum Compatible
$12.25
Today
BA2V Support Documentation
BA2VMounting Base, 2" x 3" x 3/8", Vacuum Compatible
$17.25
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
BA1SV/M Support Documentation
BA1SV/MMounting Base, 25 mm x 58 mm x 10 mm, Vacuum Compatible
$12.25
Today
BA1V/M Support Documentation
BA1V/MMounting Base, 25 mm x 75 mm x 10 mm, Vacuum Compatible
$12.25
3-5 Days
BA2V/M Support Documentation
BA2V/MMounting Base, 50 mm x 75 mm x 10 mm, Vacuum Compatible
$17.25
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Magnetic Bases

  • Magnetic Versions of Our Most Popular Bases
  • Holds Position of Components During Initial Setup Process
  • Relief Cuts in Base Provide Excellent Stability

These anodized aluminum magnetic bases are modeled after our popular standard bases but are enhanced by bottom-mounted rare earth magnets, which provide the ability to temporarily secure components during the setup process. The force from these magnets is strong enough to help prevent accidental movement of components, while still allowing for easy repositioning. The full functionality of these bases can only be achieved when using them on a magnetic table or breadboard; however, they can function as a standard base on non-magnetic surfaces as well.

Each base attaches to a post holder via cap screws that fit within a bottom-located 1/4" (M6) counterbored hole. For final attachment to an optical breadboard, each base features at least one slot for a 1/4"-20 (M6) cap screw. Once positioning is complete, these bases must be screwed down to be permanently secured to the table. The BA1SR provides one 1.10" (27.9 mm) slot and allows for the smallest footprint. For increased stability while maintaining a small footprint, the BA1R provides two 0.81" (20.1 mm) slots. Finally, for the most support, the BA2R features two 1.25" (31.8 mm) slots. In addition, the BA2R comes with four bottom-located M3 counterbored holes for 34 mm rail mounting.

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BA1SR Support Documentation
BA1SRMagnetic Mounting Base, 1" x 2.3" x 3/8"
$11.50
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BA1R Support Documentation
BA1RMagentic Mounting Base, 1" x 3" x 3/8"
$12.00
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BA2R Support Documentation
BA2RMagnetic Mounting Base, 2" x 3" x 3/8"
$18.00
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+1 Qty Docs Part Number - Metric Price Available / Ships
BA1SR/M Support Documentation
BA1SR/MCustomer Inspired!Magnetic Mounting Base, 25 mm x 58 mm x 10 mm
$11.50
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BA1R/M Support Documentation
BA1R/MCustomer Inspired!Magnetic Mounting Base, 25 mm x 75 mm x 10 mm
$12.00
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BA2R/M Support Documentation
BA2R/MMagnetic Mounting Base, 50 mm x 75 mm x 10 mm
$18.00
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Adjustable Mounting Bases

  • Two-Dimensional Adjustment of Components Without Removing Base from Breadboard
  • Same Stability and Footprint as the BA2 Base
  • Machined Bottom Relief Cuts Ensure Stability

The anodized aluminum BA2T2(/M) complements our popular line of standard mounting bases. It features a 1" (25.4 mm) long, counterbored slot along the center length that contains a 1/4"-20 (M6) threaded stud ideal for use with our Ø1/2" post holders. This slot provides for two-dimensional positioning of any attached optical component. To reposition a post holder on the base, loosen it by rotating it counter-clockwise, slide it into the desired position, and retighten it to the base. The base also contains two 1/4"-20 (M6) counterbored holes located on either side of the 1" long slot.

The BA2T2 is shown on the right with a Ø1/2" post holder, a Ø1/2" post, and a KM100 Ø1" mirror mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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BA2T2 Support Documentation
BA2T2Adjustable Mounting Base, 2" x 3" x 3/8"
$22.50
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BA2T2/M Support Documentation
BA2T2/MAdjustable Mounting Base, 50 mm x 75 mm x 10 mm
$22.50
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Flexure Clamping Base

BA2F Drawing
Click for Details

BA2F Base for Ø1" (Ø25.0 mm) Posts
Mechanical Drawing
(Click Here for the Metric BA2F/M Drawing)
BA2E Drawing
Click for Details

BA2E Base for Ø1/2" (Ø12.7 mm) Posts
Mechanical Drawing
(Click Here for the Metric BA2E/M Drawing)
Clamping Mechanism
Click to Enlarge
Steel Insert Prevents Damage to Flexure Mechanism by Limiting Overall Travel
  • Mounting Base with Double Bore Flexure Clamping Mechanism
    • BA2E(/M): Ø1/2" (Ø12.7 mm) Double Bore
    • BA2F(/M): Ø1" (Ø25.0 mm) Double Bore
  • Mounts Ø1/2" (Ø12.7 mm) PostsØ1/2" Post Holders,
    or Ø1" (Ø25.0 mm) Posts
  • Coarse Height and 360° Rotational Adjustment
  • 8-32 (M4) Tapped Hole for Rotation Hard Stop with a Post Collar
  • Machined Bottom Relief Cuts Ensure Stability
Set Screw with Collar
Click to Enlarge
When Used with a Screw the 8-32 (M4) Tap Acts as a Rotational Stop

These mounting bases contain a central double bore and non-marring flexure clamping mechanism that allows for the mounting of  Ø1/2" (Ø12.7 mm) postsØ1/2" post holders, or Ø1" (Ø25.0 mm) posts. The flexure clamp is actuated by a side-located 3/8"-24 (M10 x 1.5) setscrew and 3/16" (5 mm) hex key. A permanent steel insert at the end of the flexing mechanism, shown to the left, acts as a hard stop and prevents damage to the clamp from over tightening.

The double bore that goes through the part allows a post to be mounted within the base and in direct contact to the optical table surface. Standard bases have the post or post holder mounted directly on their surface which will inherently increase the minimum optical axis height and make the system less stable*. The method of mounting also removes the need for intermediary parts, such as a post holder, when mounting a post.

The height of the mounted post can be stably raised by 6.0 mm (0.24") within the Ø1/2" (Ø12.7 mm) double bore of the BA2E(/M) and by 7.0 mm (0.28") within the Ø1" (Ø25.0 mm) double bore of the BA2F(/M). The use of an R2 or R2T post collar with the BA2E(/M) or an RM1A or RM1B collar with the BA2F(/M) will create a hard stop for repeatable height adjustments. Each mount also contains an 8-32 (M4) tapped hole next to the double bore. With a cap screw or setscrew inserted into this hole, the post collars can also be used as a rotational stop, as shown for the BA2E in the image to the right.

The BA2E(/M) contains two 1.25" (31.8 mm) long counterbored slots for 1/4"-20 (M6) cap screws for attachment to an optical table or breadboard. In contrast, the BA2F(/M) contains two 1.25" (31.8 mm) long clearance slots for 1/4"-20 (M6) cap screws. Please see the mechanical drawings to the above right for details.

Please note that the flexure mechanism for the BA2F will contact the steel insert when mounting Ø1/2" post holders, since they are slightly smaller in diameter than Ø1" posts. This is normal operation and will not harm the mounting base.

If a Japanese post standard (Ø12.0 mm) needs to be used with the BA2E(/M), an AD12BA barrel adapter will be needed to bridge the 0.7 mm (0.03") gap between the post and flexure arm. The flexure arm will not be able to contact the smaller post diameter without this.

*A stability test was performed with a Ø1/2" (Ø12.7 mm) post mounted in a BA2E so that the post was in contact with the optical table. This was compared with a post mounted via a cap screw to our standard BA2 base. A 20 in-lb force was applied perpendicular to the post axis in both cases and the deflection of the post was recorded. Upon completion, the post within the BA2F had an overall deflection from center of about 0.001", while the post on the BA2 had a deflection from center of 0.002".

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
BA2E Support Documentation
BA2EFlexure Clamping Base / Post Mount, Ø1/2" Double Bore, 2.00" x 3.00" x 0.48"
$30.00
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BA2F Support Documentation
BA2FFlexure Clamping Base / Post Mount, Ø1" Double Bore, 2.00" x 3.00" x 0.48"
$30.00
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+1 Qty Docs Part Number - Metric Price Available / Ships
BA2E/M Support Documentation
BA2E/MFlexure Clamping Base / Post Mount, Ø12.8 mm Double Bore, 50.8 mm x 75.0 mm x 12.1 mm
$30.00
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BA2F/M Support Documentation
BA2F/MFlexure Clamping Base / Post Mount, Ø25.0 mm Double Bore, 50.8 mm x 75.0 mm x 12.1 mm
$30.00
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Universal Base Plate

Universal Base Plate Application
Click to Enlarge

Centrally Located Slot Allows Mounting of Components Outside of the Standard 1" Hole Pattern
UBP2 Drawing
Click for Details

Mechanical Drawing
  • Compatible with Imperial or Metric Breadboards, Posts, and Post Holders
  • 1.25" (31.8 mm) Long Counterbored Slot for 1/4" (M6) Cap Screws Allows for Rotation and Translation
  • Tapped Holes:
    • 1/4"-20 (M6) (Qty. 6)
    • 8-32 (M4) (Qty. 16)
    • 4-40 (Qty. 4)
  • Counterbored Holes:
    • 1/4" (M6) (Qty. 4, Two Per Side)
    • #8 (M4) (Qty. 4, Two Per Side)

The UBP2(/M) Universal Base Plate increases the flexibility of any optical setup by providing mounting holes in virtually any orientation on an optical table or breadboard. This freedom allows users to mount various components or stages in a wide array of orientations outside of what is dictated by the standard 1" (25 mm) hole pattern. The counterbores in the plate also allow one to adapt metric components to an imperial optical table and vice versa.

The plate dimensions are 2.5" x 2.5" x 3/8" or 65 mm x 65 mm x 10 mm for the metric version. The 1.25" (31.8 mm) long counterbored slot for 1/4"- (M6) cap screws is centrally located and allows 360° rotation of the plate as well as rough translation on the optical table. An array of 1/4"-20 (M6) and 8-32 (M4) tapped mounting holes are available for mounting components in various orientations, while four 4-40 tapped holes are spaced for compatibility with our 30 mm cage system. Two counterbored holes for both 1/4" (M6) and #8 (M4) cap screws are also located on both sides of the base plate for mounting optical post assemblies.

The counterbored holes for 1/4" (M6) cap screws are located in two corners on each side of the plate and are diagonally across from one another. The counterbored holes for #8 (M4) cap screws are located on the center line perpendicular to the counterbored slot with a spacing of 2" (50.0 mm) on the top of the plate and 1" (25.0 mm) on the bottom of the plate. Please see the mechanical drawing above for more details.

Please note that these plates are not machined with relief cuts like the other plates shown on this page.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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UBP2 Support Documentation
UBP2Customer Inspired!Universal Base Plate, 2.5" x 2.5" x 3/8"
$35.00
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+1 Qty Docs Part Number - Metric Price Available / Ships
UBP2/M Support Documentation
UBP2/MCustomer Inspired!Universal Base Plate, 65 mm x 65 mm x 10 mm, Metric
$35.00
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Swivel Base Adapter

  • Convert Your Existing Post Holders into Universal Post Holder Style Mounts
  • 360° Swiveling Base Fastens to Existing Ø1/2" Post Holders via a 1/4"-20 (M6) Cap Screw
  • Magnets in Base Hold Position of Components on Breadboard During Initial Setup

Our 360° swivel base adapter fits standard Ø1/2" post holders with 1/4"-20 (M6) mounting holes and minimizes the amount of time it takes to assemble an optical system. In addition, the swivel design is ideal for applications that require a large number of components to be packed into a small area. When our Ø1/2" post holders are used with this adapter, the combination is nearly that of our very popular Universal Post Holders. This anodized aluminum adapter has the benefit of compatibility with any of our existing Ø1/2" post holders but does not offer the same height flexibility of the swiveling post holders, which allow the post to be lowered all the way to the table. 

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UPHA Support Documentation
UPHASwivel Base Adapter
$19.90
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Base Position Retainer

  • Re-Position Bases within an Optical System
  • Re-Alignment Based on Three Contact Points
  • Use Two Contact Points to Re-Position Ø1" and Ø1.5" Posts within an Optical System
  • 1.73" (43.8 mm) Long and 0.13" (3.2 mm) Thick

Thorlabs' RSPC Position Retainer is used to realign bases, and other squared-off components, that have been removed from an optical system. It acts as a marker on the breadboard or optical table in the event that you need to remove a component from your set-up. The three white dots engraved on the surface of the retainer mark the three points that contact your part. The two dots on the outer arms can be used independently as contacts for posts. For more information on using the anodized aluminum RSPC with a post, click here.

Note: The RSPC Position Retainer can also be secured to an optical table or breadboard via the CL6 clamp. This clamp is useful in situations where the RSPC cannot be placed directly over a hole in the table. The photos below illustrate the RSPC being secured to an optical table with both an 8-32 cap screw and the CL6 clamp.

RSPC Mounted Directly to Optical Table
Click to Enlarge

RSPC Mounted Directly to Optical Table
RSPC Secured by CL6 Clamp
Click to Enlarge

RSPC Secured by CL6 Clamp
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
RSPC Support Documentation
RSPCCustomer Inspired!Pedestal Post Position Retainer
$9.00
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