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Ø1" Pillar Post Mounts


  • Mount Ø1" (Ø25 mm) Pillar Post Extensions
  • Height and Rotational Adjustments
  • Flexure Clamping Mechanisms Provide High Clamping Force

BA2F

Flexure Clamping Base

RB2

Adjustable Height
Post Base

BA2F Clamping Base Mounting a Ø1" Post (Post Not Included)

RB2 Post Base Mounting a Ø1" Post (Post Not Included)

POLARIS-CA1 Clamping Arm Mounting a Polaris Ø1" Monolithic Optic Mount
(Mount and Mirror Not Included)

POLARIS-SCA1

Polaris® Clamping Arm

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Features

Thorlabs' Ø1" Post Mounts allow Ø1" (Ø25 mm) Pillar Posts to be secured to an optical table at various heights and angles of rotation. They provide mounting flexibility while remaining stable and secure. Additionally, the BA2F is compatible with Ø1/2" post holders. The POLARIS-SCA25/M and POLARIS-CA25/M can also be used to mount Ø1/2" post holders; however, be sure to not over-torque the arm while the post holder is inserted and to loosen the clamp sufficiently when removing the post holder to prevent damage.

In addition to the post mounts offered here, we also carry Ø1" post holders that mount to an optical table using a clamping fork and offer a larger post height adjustment range.


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Polaris® Non-Bridging Clamping Arms

POLARIS-CA1 Test Data
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.
POLARIS-CA1 Test Data
Click to Enlarge
The arm can be mounted with either flat surface in contact with the table, allowing for compact setups.
POLARIS-CA1 Test Data
Click to Enlarge

Side-Located 1/4"-20 (M6) Screw Actuates Clamping Bore
  • 3-Point Contact Bore with Flexure Clamping Mechanism
  • 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.

Industry Standard Clamping Fork Test Data
Click to Enlarge
Figure 1: A Bridge is Created When an Industry Standard Clamping Fork is Used with a Pedestal Post
Polaris Clamping Arm Test Data
Click to Enlarge
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.

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)
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)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
POLARIS-SCA1 Support Documentation
POLARIS-SCA1Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 0.75" Counterbored Slot, 1/4"-20 Clamping Screw
$77.50
Today
POLARIS-CA1 Support Documentation
POLARIS-CA1Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1.30" Counterbored Slot, 1/4"-20 Clamping Screw
$82.48
Today
+1 Qty Docs Part Number - Metric Price Available
POLARIS-SCA1/M Support Documentation
POLARIS-SCA1/MFlexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 19.1 mm Counterbored Slot, M6 Clamping Screw
$77.50
Today
POLARIS-SCA25/M Support Documentation
POLARIS-SCA25/MFlexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, 19.1 mm Counterbored Slot, M6 Clamping Screw
$77.50
Lead Time
POLARIS-CA1/M Support Documentation
POLARIS-CA1/MFlexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 33.0 mm Counterbored Slot, M6 Clamping Screw
$82.48
Today
POLARIS-CA25/M Support Documentation
POLARIS-CA25/MFlexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, 33.0 mm Counterbored Slot, M6 Clamping Screw
$82.48
Today

Ø1" Pillar Post Mount

RB2 Mounting a Ø1
Click to Enlarge
Deep Base Allows Height Adjustment
  • RB2 Base Allows Post Extensions to be Used as a Variable Height Mounting Structure
  • Hollow Base Allows Post Extension to Pass Through for 0.5" of Height Adjustability
  • Convenient Vertically Accessed Locking Screw

The RB2(/M) pillar post base mounts Ø1" (25 mm) optical posts at a variable height (shown to the right). The hollow base allows the post to pass through, allowing 0.5" of post height adjustment. Translation is locked via a top-located clamping screw.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RB2 Support Documentation
RB2Adjustable Height Post Base for Ø1" RS Series Post Extensions
$34.36
Today
+1 Qty Docs Part Number - Metric Price Available
RB2/M Support Documentation
RB2/MAdjustable Height Post Base for Ø25 mm RS Series Post Extensions
$34.36
Today

Flexure Clamping Ø1" Pillar Post Mount

  • Post Mount with a Ø1" (Ø25 mm) Double Bore and Flexure Clamping Mechanism
  • Mounts Ø1" Posts or Ø1/2" Post Holders
  • 0.325" (8.3 mm) of Height Adjustment and 360° Coarse Rotational Adjustment
  • 8-32 (M4) Tapped Hole for Rotation Hard Stop with the RM1B Ø1" Post Collar

The BA2F Post Mount features a Ø1" (Ø25 mm) double bore and flexure clamping mechanism. This clamp allows for both height and rotational adjustment of either an Ø1" optical post or a Ø1/2" post holder. The clamping mechanism is actuated by a 3/8"-24 (M10 x 1.5) clamping screw with 3/16" (5 mm) hex key. A permanent steel insert* at the end of the flexing mechanism prevents damage to the clamp from overtightening.

An RM1A or RM1B Ø1" post collar can be used with Ø1" posts or Ø1/2" post holders as a hard stop for repeatable height adjustment. The base also features an 8-32 (M4) tapped hole near the double bore; when a cap screw or setscrew is inserted into this hole, the post collar can also function as a rotational stop (see photo on the top right).

Each base has two 1.25" (31.8 mm) long counterbored slots for 1/4"-20 (M6) cap screws for attachment to an optical table or breadboard.

*Since our Ø1/2" post holders are slightly smaller in diameter than our Ø1" posts, the flexure mechanism will contact the steel insert when mounting Ø1/2" post holders. This is normal and will not harm the mounting base.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
BA2F Support Documentation
BA2FFlexure Clamping Base / Post Mount, Ø1" Double Bore, 2.00" x 3.00" x 0.48"
$33.60
Lead Time
+1 Qty Docs Part Number - Metric Price Available
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
$33.60
Today
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