Ø1" (Ø25 mm) Pillar Posts

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SPW501 Spanner Wrench Being Used to Tighten a Small Ø1" Post onto a Ø1" Pillar Post

• Solid Stainless Steel Construction
• 1/4"-20 (M6) Tapped Hole
• Large Diameter Relief Cut on Top and Bottom for Additional Mounting Stability
• Spanner Wrench for Ø1" Posts and Ø1/2" Posts

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.

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Post Spacer Being Used to Increase the Post Height
by 5 mm (0.2")

• Solid Stainless Steel Construction
• 1/4" (M6) Clearance Hole
• Large Diameter Relief Cut on Top and Bottom for Additional Mounting Stability

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.

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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.

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Hold the knife edge at a 45° angle to the shim
to peel away layers.

• Peel Away Individual Layers as Needed
• Stainless Steel
• Tabbed for Easy Peeling
• Sold in Packs of 5

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.

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The RS1LM Shown Separating the RS2P Post and the PRM1 Rotation Mount

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.

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The BE1R has a magnet in the base for stability in temporary setups.

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These base adapters feature a 1/8" (3 mm) hex socket on the bottom for tightening.

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The CF038C(/M)-P5, CF125C(/M), and CF175C(/M) each offer a captive screw.

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Several Slot Lengths Available

• BE1(/M) and BE1R(/M) Adapters Convert Standard Ø1/2" Post Holders and Ø1" Posts into Pedestal-Style Mounts
• Clamping Fork or CL8 Table Clamp Secures Pedestal-Style Mount to a Breadboard or Optical Table
• Three Sizes Provide Clamping with 1/4"-20 (M6) Cap Screws
  • 0.38" (9.5 mm) Long Counterbored Slot [CF038-P5 and CF038C(/M)-P5]
  • 1.24" (31.5 mm) Long Counterbored Slot [CF125 and CF125C(/M)]
  • 1.75" (44.4 mm) Long Counterbored Slot [CF175 and CF175C]
  • 1.76" (44.8 mm) Long Counterbored Slot [CF175C/M]
• Swivel Clamping Fork 360° to Select Most Convenient Mounting Hole
• CF038C(/M)-P5, CF125C(/M) and CF175C(/M) Each Include a 1/4"-20 (M6)-Threaded Captive Screw
• BE1(/M) and All Clamping Forks Available in Packs of Five [CF038-P5 and CF038C(/M)-P5 Not Sold Individually]

Pedestal Base Adapters
The BE1(/M) and BE1R(/M) pedestal base adapters feature a 1/4"-20 (M6)-threaded stud that fit into the bottom of our standard Ø1/2" post holders or Ø1" posts to convert them into pedestal-style mounts for added stability. The BE1R(/M) adapter features a magnet in the base that is sufficiently strong to securely hold the base in place without clamping to an optical table (see photo at the top right). Made from solid 303 stainless steel with a 1.25" (31.8 mm) outer diameter, these adapters allow standard Ø1" posts to be used with the clamping forks sold below.

The BE1(/M) base adapter is available in a pack of five for ease of ordering.

Clamping Forks
These clamping forks are designed to provide exceptional clamping force when used with our Ø1/2" post holders and Ø1" posts that have been adapted using the BE1(/M) or BE1R(/M) to pedestal-style mounts. They can also be used with our pedestal-style Ø1/2" post holders or Ø1" pedestal posts without any need for the BE1(/M) or BE1R(/M).

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).

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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.

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The arm can be mounted with either flat surface in contact with the table, allowing for compact setups.

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Side-Located 1/4"-20 (M6) Screw Actuates Clamping Bore

• 3-Point Contact Bore with Flexure Clamping Mechanism
  • Versions for Ø1" or Ø25 mm Posts for Polaris Mounts and Ø1" Monolithic Polaris Mount (See Table Below)
  • 0.60" Bore Depth Supports Height Adjustments Up to 0.25"
  • Allows Posts to be Rotated 360°
• 0.75" (19.1 mm) or 1.30" (33.0 mm) Slot for 1/4"-20 (M6) Cap Screw
• Heat-Treated, Stress-Relieved Stainless Steel Provides Large Clamping Force
• Design Supports Left- and Right-Handed Orientations (See Lower Left Image)
• High Stability Ideal for Use with Our Kinematic Polaris Mirror Mounts
• Vacuum Compatible to 10^-9 Torr at 25 °C with Proper Bake Out
• ±0.001" (±0.02 mm) Surface Flatness

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
vs. Polaris Clamping Arm

Industry standard clamping forks are designed with a bridge, as shown in Figure 1, for clamping to pedestal-style posts or post holders. This design will slightly damage the laser platform during each use by pulling up the part of the platform located under the bridge. The Polaris clamping arm, as shown in Figure 2, is designed with a flat top and bottom to eliminate this problem.

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Figure 1: A Bridge is Created When an Industry Standard Clamping Fork is Used with a Pedestal Post

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Figure 2: The Polaris Clamping Arm Eliminates the Bridge Created by an Industry Standard Clamping Fork

The flexure clamp, shown in the photo to the left, is actuated using a side-located 1/4"-20 (M6 x 1.0) cap screw and allows a post to be rotated 360° about its center. As the flexure clamp and mounting slot are secured with separate screws, the position of the fork and the rotational alignment of the post can be adjusted independently. While best performance is achieved with full post engagement, the 0.60" (15.2 mm) thick mounting bore supports up to 0.25" of post height adjustment.

The Polaris clamping fork design has undergone extensive testing to ensure high-quality performance; see the graph to the upper right. For optimal performance, we recommend tightening the flexure clamping screw of an imperial clamping arm with 15 to 25 in-lb of torque and the flexure clamping screw of a metric clamping arm with 1.75 to 3 N•m of torque. When mounting to a table or platform, we recommend using 40 to 65 in-lb of torque for an imperial clamping arm and 4.75 to 7 N•m of torque for a metric clamping arm. Please note that the values for imperial and metric clamps are not a direct conversion due to an efficiency difference between 1/4"-20 and M6 x 1.0 screws. The efficiency of M6 x 1.0 screws is about 5% less than that of 1/4"-20 screws due to differences in diameter and pitch. For best results, use the maximum recommended torques from each range. These torque values can be dialed in using a torque driver.