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Ø1" (25 mm) Post Holders


  • Hold Ø1" (25 mm) RS Pillar Posts
  • Flexure Design Provides Stability
  • Bottom-Located Tapped Hole or Pedestal Base

Rear Flexure
Locking Mechanism

RSH1.5

RSHT3

RSH4

RSHT2

RSHT1.5 Post Holder on a BA2 Base

Bottom-Located Tap

Pedestal Base

Related Items


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Top View of Ø1" Post Holders Showing the Flexure Lock and Relief Cuts

Features

  • Post Holders with Flexure Locking Mechanism for Ø1" Posts
    • Bottom-Located Tapped 1/4"-20 (M6) Mounting Hole
    • Pedestal Base Compatible with PF175 Clamping Fork
  • Available Lengths: 1.5" (38 mm), 2" (50 mm), 3" (75 mm), and 4" (100 mm)
  • Imperial and Metric Locking Options Available

These Ø1" Post Holders are the ideal solution for mounting optical components with maximum stability and an adjustable height. They are designed to be used with our stainless steel Ø1" Posts, which are offered in a range of fixed heights. These post holders provide the same level of stability as a pillar post directly threaded into an optical table or a pedestal post secured with a clamping fork. When using a longer post, a taller post holder should also be used to ensure the greatest stability. Please see the Stability tab for more information and the results of an experiment comparing various mounting options.

The flexure design of the post holder supports the post in a clamping mechanism that is secured with an 8-32 (M4) cap screw using a 9/64" (3 mm) hex key. The circular groove in the central bore allows the metal to flex and clamp the post's position without breaking. When locked, the square groove provides two fixed contact lines with the post to maximize the clamping force. The RSHT post holders have a base with a bottom-located 1/4"-20 (M6) tapped hole for mounting. This allows these post holders to be used with our Post Holder Bases, such as the BA2. This design does not allow a post to pass all the way through the post holder and always leaves the post resting at least 0.24" (6.1 mm) above the table surface. By contrast, the RSH post holders have a pedestal base and can be easily secured to a breadboard or optical table using the PF175 clamping fork. The central bore of these post holders goes through the base, allowing Ø1" posts to pass all the way through the post holder and rest on the optical table surface for minimum beam height.

We also offer Ø1" post mounts, which mount a Ø1" post to an optical table without the use of a clamping fork.

Stability Test Setup
Click to Enlarge

Stability Test Apparatus

The stability of a Ø1" post mounted in an RSH flexure post holder was compared to that of a post directly threaded to a breadboard and a post with a pedestal base secured to a breadboard with a clamp. The experimental apparatus consisted of an RS6 post held in an RSH post holder that was clamped to a breadboard with a PF175 clamping fork. A 2" moment arm was clamped to the post, and a variable load was applied to the end of the arm. As different loads were applied to the moment arm, the deflection of the post was measured with a dial indicator. The experiment was then repeated with the post threaded directly into the breadboard and with a pedestal post secured by a clamping fork. The results are shown in the graph below.

RSH Deflection
Click to Enlarge

Results of an Experiment Investigating the Deflection of a Ø1" Post Under a Variable Load for Different Mounting Conditions

The test results indicate that, within the accuracy of the measurements, the RSH post holder is just as stable as the other two mounting options. However, instabilities can be introduced when a shorter post holder is used with a longer post. We recommend that you use a taller post holder with taller posts to avoid any loss of stability.


Posted Comments:
cvoth  (posted 2015-04-08 10:30:48.79)
I also agree. I need a tapped 1/4-20 hole on the bottom.
jlow  (posted 2015-04-14 10:24:01.0)
Response from Jeremy at Thorlabs: Thank you very much for the feedback. I have forwarded this request to the product engineer and we will look into this.
yan.jiang2  (posted 2015-01-14 17:09:25.27)
I agree with david.thompson. I also want to have an adjustable height 1" post. These would be great if there was a tapped 1/4-20 hole on the bottom.
cdaly  (posted 2015-01-20 03:27:35.0)
Response from Chris at Thorlabs: Thank you for your feedback. We will look into the possibility of adding this feature to the post holders.
david.thompson  (posted 2014-06-25 15:50:19.343)
these post holders lack the 1/4-20 tap on the bottom that would enable them to be mounted to base plates. I just ordered one to support an optical isolator. I am disappointed because I would like to mount it to a base plate, so that if we move it around it will be more stable. Forks are great for tight places, but bad for balance when storing or temporarily moving things. I wish that this mount had both options. You buy these for stability. But if you risk something tipping over when it is untightened and bumped that's not a great tradeoff...THanks
cdaly  (posted 2014-08-06 05:16:32.0)
Response from Chris at Thorlabs: Would it be possible instead to use ether the BA2F(/M) or RB2(/M) clamp with your 1" diameter posts? These are generally pretty stable and can eliminate the need for the post holder and clamping fork all together if the post is reasonably close to the required height.
sharrell  (posted 2012-06-21 13:54:00.0)
Response from Sean at Thorlabs to Last Two Posters: Thank you for your feedback on our new Ø1" Post Holders! We have indeed updated the graph on the "Stability" Tab. The original version showed two sets of data using the new post holders: a 6" long post in a 2" long post holder, and a 6" long post in a 1.5" long post holder. We do not recommend using such a short post holder for this length of post, and it was our hope that this would be clear from the plot. Based on your comment, we decided to show only recommended mounting options in the plot. In addition, we are reviewing the text on this tab to be sure that the test parameters and the recommended mounting options are clear.
user  (posted 2012-06-21 13:16:42.0)
Much better now.
Saleau  (posted 2012-06-21 04:03:03.0)
Your deflection graph is strange. If I believe it then I should not buy this post holder since the usual mounting is better. Do you not wish to sell these?

Ø1" (25 mm) Post Holders with Tapped Holes


Click to Enlarge

Bottom View of an RSHT2/M Post Holder
  • Flexure Lock Post Holders for Ø1" Posts
  • Bottom-Located 1/4"-20 (M6) Tap for Direct Mounting
  • Available Lengths: 1.5" (38 mm), 2" (50 mm), 3" (75 mm), and 4" (100 mm)

RSHT post holders have a 1/4"-20 (M6) tapped hole for mounting located in the bottom of the base. These post holders can be used with our standard Post Holder Bases, such as the BA2.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RSHT1.5 Support Documentation
RSHT1.5Customer Inspired! Ø1" Post Holder with Flexure Lock, 1/4"-20 Tap, L = 1.5"
$32.31
Today
RSHT2 Support Documentation
RSHT2Customer Inspired! Ø1" Post Holder with Flexure Lock, 1/4"-20 Tap, L = 2"
$32.31
Today
RSHT3 Support Documentation
RSHT3Customer Inspired! Ø1" Post Holder with Flexure Lock, 1/4"-20 Tap, L = 3"
$36.51
Today
RSHT4 Support Documentation
RSHT4Customer Inspired! Ø1" Post Holder with Flexure Lock, 1/4"-20 Tap, L = 4"
$47.28
Today
+1 Qty Docs Part Number - Metric Price Available
RSHT1.5/M Support Documentation
RSHT1.5/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, M6 Tap, L = 38 mm
$32.31
Today
RSHT2/M Support Documentation
RSHT2/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, M6 Tap, L = 50 mm
$32.31
Today
RSHT3/M Support Documentation
RSHT3/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, M6 Tap, L = 75 mm
$36.51
Today
RSHT4/M Support Documentation
RSHT4/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, M6 Tap, L = 100 mm
$47.28
Today

Ø1" (25 mm) Post Holders with Pedestal Base

  • Flexure Lock Post Holders for Ø1" Posts
  • Pedestal Base for Use with PF175 Clamping Fork (Sold Separately Below)
  • Post Can Pass Through Post Holder for Minimum Beam Height
  • Available Lengths: 1.5" (38 mm), 2" (50 mm), 3" (75 mm), and 4" (100 mm)

RSH post holders have a pedestal base and can be easily secured to a breadboard or optical table using the PF175 clamping fork (sold separately below). The central bore of these post holders goes through the base, allowing Ø1" posts to pass all the way through the post holder.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RSH1.5 Support Documentation
RSH1.5Customer Inspired! Ø1" Post Holder with Flexure Lock, Pedestal Base, L = 1.5"
$32.31
Today
RSH2 Support Documentation
RSH2Customer Inspired! Ø1" Post Holder with Flexure Lock, Pedestal Base, L = 2"
$32.31
Today
RSH3 Support Documentation
RSH3Customer Inspired! Ø1" Post Holder with Flexure Lock, Pedestal Base, L = 3"
$36.51
Today
RSH4 Support Documentation
RSH4Customer Inspired! Ø1" Post Holder with Flexure Lock, Pedestal Base, L = 4"
$47.28
Today
+1 Qty Docs Part Number - Metric Price Available
RSH1.5/M Support Documentation
RSH1.5/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, Pedestal Base, L = 38 mm
$32.31
Today
RSH2/M Support Documentation
RSH2/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, Pedestal Base, L = 50 mm
$32.31
Today
RSH3/M Support Documentation
RSH3/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, Pedestal Base, L = 75 mm
$36.51
Today
RSH4/M Support Documentation
RSH4/MCustomer Inspired! Ø25 mm Post Holder with Flexure Lock, Pedestal Base, L = 100 mm
$47.28
Today

Clamping Fork

The PF175 clamping fork secures RSH post holders to any breadboard or optical table. This clamping fork create three points of contact with the table for high stability.

Please note that significant overtightening of clamping forks can deform the surface of an optical table, which can cause misalignment of components and decrease stability of the clamping fork.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PF175 Support Documentation
PF175Clamping Fork for Ø1.5" Pedestal Post or Post Pedestal Base Adapter, Universal
$18.81
Today
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