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Ø1" (Ø25 mm) Pillar Posts![]()
RS12 RS6 RS4 RS3 RS2 RS1.5 RS1 RS075 RS05 RS10M RS8M RS024 RS016 Ø1" (Ø25 mm) Post Spacers Smooth or Threaded Bore Turn Ø1" Posts into CF125 BE1 Application Idea 3/16" (5 mm) RS4 Post Mounted in Related Items ![]() Please Wait ![]() Click to Enlarge RS4 Pillar Post Shown Mounted in a Flexure Clamping Base, Allowing for Small Height Adjustments ![]() Click to Enlarge Mirror Center of a Ø1/2" Polaris Mirror Mount Raised to a Standard 2.00" Height Using the PLS-P150 Post Features
Thorlabs' Ø1" (Ø25 mm) Pillar Posts are a basic component in any optical setup. Posts with heights between 0.5" (12.5 mm) and 12" (300 mm) are available below, as well as a variety of post construction accessories. Ø1" (Ø25 mm) posts designed to mount our Polaris mirror mounts are also available. Standard Ø1" (Ø25 mm) Posts Pillar posts are available in a variety of heights from 0.5" (12.5 mm) to 12" (300 mm). Additional heights can be achieved by stacking posts with heights of 0.39" (10 mm) or shorter on top of a standard pillar post. These posts can be stacked easily and securely by using the SPW501 or a balldriver on the torque hole, which provides extra leverage while tightening the components onto each other. Ø1" (Ø25 mm) Posts Designed for Polaris Mirror Mounts
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These pillar posts are machined from nonmagnetic 303 stainless steel and provide strong support in an optical setup. By combining the rigidity of these solid Ø1" posts with Ø1" post mounts or Ø1" post holders, any arbitrary height support structure can be constructed. Each post is machined with a 8-32 tapped hole in both ends for direct mounting to an optical mount and breadboard. These posts can be adapted to bases with 1/4" (M6) counterbores by using SD1 counterbore adapters. 8-32 setscrews, available in our HW-KIT3 hardware kit, can be used to secure posts on top of each other, or to our Fixed Lens Mounts with Intenal Threads. ![]()
These pillar posts are machined from nonmagnetic 303 stainless steel and provide strong support in an optical setup.By combining the rigidity of these solid Ø25.0 mm posts with Ø25.0 mm post mounts or Ø25.0 mm post holders, any arbitrary height support structure can be constructed. Each post is machined with a M4 tapped hole in both ends for direct mounting to an optical mount and breadboard. These posts can be adapted to bases with M6 (1/4") counterbores by using SD1 counterbore adapters. M4 setscrews, available in our HW-KIT3/M hardware kit, can be used to secure posts on top of each other, or to our Fixed Lens Mounts with Internal Threads. ![]()
These pillar posts provide strong support in an optical setup. By combining the rigidity of these solid Ø1" posts with our high stability RB2 base, any arbitrary height support structure can be constructed. Each post is machined with a 1/4"-20 tapped hole in both ends for direct mounting to an optical table or standard base and an optical mount. These posts are machined from nonmagnetic 303 stainless steel. To convert the 1/4"-20 taps to 8-32 taps, we separately offer the AE8E25E thread adapter, which has external 1/4"-20 threading and internal 8-32 threading. The adapter can be used with an 8-32 setscrew to attach many of Thorlabs' imperial optomechanical parts to a Ø1" imperial pillar post. In principle, the adapter can also be used to connect two pillar posts, but a solid 1/4"-20 setscrew, which is included in our HW-KIT4 hardware kit, is a more stable choice for this. ![]()
These pillar posts provide strong support in an optical setup. By combining the rigidity of these solid Ø25.0 mm posts with our high stability RB2 base, any arbitrary height support structure can be constructed. Each post is machined with an M6 tapped hole in both ends for direct mounting to an optical table or standard base and an optical mount. These posts are machined from nonmagnetic 303 stainless steel. To convert the M6 taps to M4 taps, we separately offer the AE4M6M adapter, which has external M6 threading and internal M4 threading. The adapter can be used with an M4 setscrew to attach many of Thorlabs' metric optomechanical parts to a Ø25.0 mm metric pillar post. In principle that adapter can also be used to connect two pillar posts but a solid M6 setscrew as included in the hardware kit HW-KIT4/M will provide a more stable solution. ![]() ![]() Click for Details Directly attach a Polaris mount via a top-located 8-32 (M4) mounting hole without the need for a thread adapter. Dowel pins (not included) provide precision mounting.
Our Polaris® Posts are machined from heat-treated stainless steel to provide stable support for our Polaris Mirror Mounts. Heat treating the materials removes the internal stresses that can cause temperature-dependent hysteresis. All of our Polaris mirror mounts, clamping arms, and 45° adapters are constructed from this same material, which has a relatively low coefficient of thermal expansion (CTE). Matching the CTE of materials within an optical setup is essential to achieve optimal thermal repeatability. Each post contains one or three top-located 8-32 (M4 x 0.7) mounting holes and a bottom-located 1/4"-20 (M6 x 1.0) mounting hole. The 8-32 (M4 x 0.7) threads allow a mirror mount to be attached directly to the post, eliminating the need for thread adapters and thereby reducing the instability created when stacking multiple optomechanical components. Versions of these posts with a single 8-32 (M4 x 0.7) mounting hole can be used with our smaller Polaris mounts, while the posts with three 8-32 (M4 x 0.7) mounting holes are ideal for securing larger Ø2" and Ø3" Polaris mounts with more than one screw. Popular post lengths are available from stock; custom lengths can be requested using the configurator below (single-mounting-hole versions only) or by contacting Tech Support. Created with OEM and custom systems in mind, each post features holes for DIN-7m6 ground dowel pins (not included) on either side of the central threaded hole at each end to aid with alignment. Securing posts and accessories within a system using dowel pins prevents them coming loose due to vibrations, shipping, or incidental contact. Our Polaris Clamping Arms, available below, are the ideal mounting solution for these posts. These clamping arms feature a non-bridging design that reduces the gap, or “bridge,” that traditionally results between the back of a standard clamping fork and a Ø1" pedestal post base. Click here for more information on these posts including OEM mounting options, mounting stability details, and test data. OEM Solutions and Volume OrdersThorlabs manufactures custom and high-volume Polaris products for use in custom and OEM systems. See our custom configurator below for our custom post options. High-volume discounts are built into the configurator, with a minimum order size of 26 posts required to recieve the discount. For pricing information on high-volume orders of our standard posts, please contact OEM Sales. Alignment Bore Cleanroom and Vacuum Compatibility
![]() ![]() Click to Enlarge SPW501 Spanner Wrench Being Used to Tighten a Small Ø1" Post onto a Ø1" Pillar Post
These small posts are designed for achieving "in between" heights of our Ø1" (Ø25 mm) Posts without compromising structural rigidity. The center 1/4"-20 (M6) tapped through hole allows threaded studs to pass through to the mating tap of the components on the top and bottom. Each features two slots on the side which allow it to be securely tightened onto a post using the SPW501 spanner wrench (sold below), as shown in the image to the right. Posts with lengths 0.35" (9 mm) or larger feature a through hole instead of the two slots; this through hole accepts a 1/8" (3 mm) balldriver as well as the SPW501 for providing leverage while tightening or loosening. ![]()
These spacers are designed for achieving "in between" heights of our Ø1" (Ø25 mm) Posts without compromising structural rigidity. The center Ø1/4" (M6) clearance hole allows threaded studs to pass through to the mating tap of the components on either side of the spacer. Achieving, for example, a total post height of 8.2" is as simple as inserting one RS5M spacer (0.2" thickness) in between two RS4 posts (4" length). Two hex-driven setscrews are included with each spacer. The 1 mm through 6 mm spacers include an M6 x 20 mm setscrew and a 1/4"-20 x 7/8" setscrew, while the 7 mm through 10 mm spacers include an M6 x 25 mm setscrew and a 1/4"-20 x 1" setscrew. ![]() ![]()
![]() ![]() Click to Enlarge The SPW501 wrench tightens Ø1" posts that have torque slots or holes. The SPW501 Spanner Wrench is designed to tighten or loosen Ø1" posts that have torque slots, as illustrated in the photo to the right. The SPW501 can also be used with Ø1/2" posts and Ø1" posts that have through holes. The wrench is designed to fit into the slot or through hole and provide leverage for tightening or loosening the post when mounting the post directly to a tapped hole. Please use minimal force when tightening to prevent binding due to overtightening. ![]()
This Ø25 mm, peelable, laminated shim provides fine height adjustment when using our Ø1" posts. These 1.0 mm ± 10% thick shims come in packs of 5 and have 14 layers, which are each 0.075 mm thick. They have a through hole to accommodate a 1/4"-20 (M6) screw. Be aware the finish on some shims may appear tarnished due to the manufacturing process. This does not affect form, fit, or function. Only the appearance is altered. To peel, take a sharp edge like a box cutter and hold it at a 45° angle to the tab on the shim as shown in the photo to the right. Gently flick the knife upward until the layer begins to lift. In general, you should be able to lift an edge within 5 attempts. If you cannot get an edge to lift, gently tap the corner of the tab on a table until the material begins to flare. Once an edge is lifted, insert the blade under the layer, squeeze the layer between your thumb and the blade, and roll your wrist down and then up to start peeling (see photo in the upper left). Once the layer has been peeled up enough, you can use your thumb and forefinger to remove it the rest of the way. Repeat this process until you have removed as many layers as desired. Discard all peeled-off layers. ![]() ![]() Click to Enlarge The BE1R has a magnet in the base for stability in temporary setups. ![]() Click to Enlarge Several Slot Lengths Available
Pedestal Base Adapters The BE1(/M) base adapter is available in a pack of five for ease of ordering. Clamping Forks Fabricated from solid 303 stainless steel, all of these clamping forks create three points of contact with the table for high stability. For flexibility in the positioning of post assemblies, the CF038-P5 and CF038C(/M)-P5 forks offer 0.38" (9.5 mm) long counterbored slots, the CF125 and CF125C(/M) forks offer 1.24" (31.5 mm) long counterbored slots, the CF175 and CF175C forks have 1.75" (44.4 mm) long counterbored slots, and the CF175C/M fork has a 1.76" (44.8 mm) long counterbored slot. The counterbored slots on the CF038-P5, CF125, and CF175 forks are designed for user-supplied 1/4"-20 (M6)-threaded cap screws. For further convenience, the CF038C(/M)-P5, CF125C(/M), and CF175C(/M) forks each include a 1/4"-20 (M6)-threaded captive screw. Please note that significant over tightening of clamping forks can deform the surface of an optical table, which can cause misalignment of components and decrease stability. Our clamping forks are also available in packages of five for ease of ordering (note: the CF038-P5 and CF038C(/M)-P5 clamping forks are only available in packs of five). ![]() ![]() Click to Enlarge Click for POLARIS-CA1/M Holding Torque Results* The Polaris clamping fork design has undergone extensive testing to ensure high-quality performance. See the full presentation for more details. *It is important to note that the 1/4"-20 and M6 x 1.0 clamping torque values have been adjusted to provide the same clamping post and table forces. Also note that the maximum recommended tightening torque for an 18-8 stainless steel screw is 75.2 in-lbs for a 1/4"-20 screw and 8.8 N-m for an M6 x 1.0 screw. Higher mounting torques can cause the screw to fail. ![]() Click to Enlarge The arm can be mounted with either flat surface in contact with the table, allowing for compact setups. ![]() Click to Enlarge Side-Located 1/4"-20 (M6) Screw Actuates Clamping Bore
The Polaris® Clamping Arms are the ideal solution for stably mounting our Ø1" or Ø25 mm Posts for Polaris Mounts or Ø1" Monolithic Polaris Mount. Each clamping arm, which is machined from heat-treated, stress-relieved stainless steel bar stock, provides extremely high holding forces with minimal torquing of the mounting screws (see the graph to the right). The flat, non-bridging top and bottom surfaces of each clamping arm allow it to be used with either side in contact with an optical table or other mounting surface. This feature allows the clamp to be positioned in left- or right-handed orientations and optical components to be placed in near contact to one another while minimizing the footprint (see the image to the left). On each side of the arm, a relief cut around the slot protects the ±0.001" (±0.02 mm) flat surface from any marring due to the screw and washer, allowing for more stable mounting. The clamping arms are offered with slot lengths of 0.75" (19.1 mm) or 1.30" (33.0 mm), providing flexibility when used in applications such as tight laser cavity setups. Four of our clamping arms are designed to hold Ø1" posts, while the remaining two are designed to hold Ø25 mm posts; see the table below for details. Note the arms with a Ø1" (25.4 mm) bore are not compatible with Ø25 mm posts; the bore diameter is too large and will not contact the post when clamping. Non-Bridging Design: Industry Standard Clamping Fork
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Item # | Compatible Post Size |
Clamping Screw |
Slot Length | Footprint |
---|---|---|---|---|
POLARIS-SCA1 | Ø1" (25.4 mm) |
1/4"-20 (3/16" Hex) |
0.75" (19.1 mm) |
2.78" x 1.60" (70.5 mm x 40.6 mm) |
POLARIS-CA1 | 1.30" (33.0 mm) |
3.33" x 1.60" (84.5 mm x 40.6 mm) |
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POLARIS-SCA1/M | M6 x 1.0 (5 mm Hex) |
0.75" (19.1 mm) |
2.78" x 1.60" (70.5 mm x 40.6 mm) |
|
POLARIS-CA1/M | 1.30" (33.0 mm) |
3.33" x 1.60" (84.5 mm x 40.6 mm) |
||
POLARIS-SCA25/M | Ø25.0 mm (Ø0.98") |
0.75" (19.1 mm) |
2.78" x 1.60" (70.5 mm x 40.6 mm) |
|
POLARIS-CA25/M | 1.30" (33.0 mm) |
3.33" x 1.60" (84.5 mm x 40.6 mm) |
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