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Mounting Platforms for 66 mm Rails


  • Dovetail Platforms with 1/4"-20 (M6) Holes and Slots
  • Mount Standard Optomechanics to 66 mm Rails
  • Clamps are Positioned by Sliding Along Rail

Optical Axis
Centered Over
Rail Axis

XT66C5

Blank Clamping
Platform

XT66C4

Clamping Platform with
Counterbored Slot

XT66D3

X-Axis Slotted Dovetail

XT66D2-50

Dovetail with
Counterbored Holes

Related Items


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Rail-Mounted Periscope
Click to Enlarge
Rail-Mounted Periscope
(See Application Idea Tab for Details)

Features

  • Compact Platforms Provide Compatibility with Standard 1/4"-20 (M6) Optomechanics
  • Conveniently Insert and Remove Mounts from an Optical Path
  • Options with Tapped Holes, Counterbored Holes, or Counterbored Slots
  • Some Models Contain Built-In Clamp for Direct Compatibility with Rails
  • Blank Clamping Platform for Custom Applications

Thorlabs provides a wide selection of platforms that permit optomechanics with standard 1/4"-20 (M6) threadings to be incorporated into a 66 mm rail assembly.

Mounting Dovetails
Our mounting dovetails contain 1/4" (M6) counterbored holes, 1/4" (M6) counterbored slots, or a single 1/4"-20 (M6) tapped hole. They attach to the rail with any of our Dovetail Clamps and are available in several different geometries, as illustrated below.

In order to maintain a minimal physical profile, our XT66D2 and XT66D3 Slotted Dovetails require our reduced-height Low-Profile Channel Screws or Low-Profile T-Nuts to fasten to standard optomechanics. The counterbores in these platforms are too shallow to accommodate standard 1/4"-20 or M6 cap screws.

Mounting Clamps
Our mounting clamps feature a built-in dovetail clamp that provides direct compatibility with 66 mm rail systems. The XT66C4 Clamping Platform contains a 1/4" (M6) counterbored slot that is parallel to the rail axis, while the XT66RC Counterbored Pivot Platform includes a 1/4" (M6) counterbored slot that can be rotated through a full 360°. We also offer the XT66C5 Blank Clamping Platform for customers who wish to machine custom mounting options.

Thorlabs offers an extensive selection of accessories for 66 mm rails, including clamps and angle brackets, breadboard mounts, mounting platforms, rail carriages, rail platform positioners, rotation slide platforms, rail joiners, and lens tube adapters. Together with size adapters that incorporate 34 mm and 95 mm rails into an XT66 setup, these tools provide a complete family of rigid, versatile building blocks suited for virtually any optomechanical setup.

app shot
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Simple Periscope, View 1 of 2


app shot
Click to Enlarge

Simple Periscope, View 2 of 2

Application Idea: A Simple Periscope

The photographs to the left depict a simple periscope constructed using our 66 mm rail system. The two photos display the same setup from two different angles in order to clearly show how each part has been integrated. The labeled parts correspond to a row in the upper table, while the lower table shows the clamps and optical mounts used throughout the periscope.

Please note that lenses and mirrors, which are not shown in the tables below, would also be required.

LabelItem #DescriptionProduct Image
1 XT66-500 66 mm Construction Rail, L = 500 mm  
2 XT66D2 50 mm Long Slotted Dovetail with One Z-Axis Counterbored Slot  
3 XT66D2-50 50 mm Long XT66 Platform with Three 1/4"-20 (M6) Counterbores  
4 XT66RA2 Right-Angle Clamp for 66 mm Rails  
5 XT66DP-500 66 mm Double Dovetail Rail, L = 500 mm  
6 XT66DE1 20 mm Long, 1/4"-20 Tapped Dovetail for 66 mm Rails  
Additional Items
  XT66C1 20 mm Long Double Dovetail Clamp for 66 mm Rails  
  XT66C2 40 mm Long Double Dovetail Clamp for 66 mm Rails  
  MA45-2 45° Mounting Adapter, Compatible with KM100 and KM200  
  KM100 Ø1" Kinematic Mirror Mount  
  LMR1 Ø1" Lens Mount  

Posted Comments:
user  (posted 2017-09-15 10:07:03.883)
Is there any possibility to make a Platform like XT66C5 Blank Clamping Platform with two/three M6 threaded holes (distance 25mm/12.5 mm)?
tfrisch  (posted 2017-09-26 03:03:12.0)
Hello, thank you for contacting Thorlabs. You may be able to use XT66C4 (slotted clamping platform) with XE25T3/M (low profile M6 nut), but if you would like to pursue a custom M6 threaded platform, please reach out to us at TechSupport@Thorlabs.com

Mounting Platforms for 66 mm Rails

XT66D2-50 Mounting Platform
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
LMR12Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
PH22Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR12Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1"
XT66D2-501Mounting Platform, Three 1/4" (M6) Counterbores, 50 mm Long
XT66C2140 mm Long Double Dovetail Clamp for 66 mm Rails
XT66-500166 mm Construction Rail, L = 500 mm
SH25S03811/4"-20 Stainless Steel Cap Screw, 3/8" Long, 25 Pack
View Metric Product List
Item #QtyDescription
Metric Product List
LMR1/M2Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
PH50/M2Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR30/M2Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 30 mm
XT66D2-501Mounting Platform, Three 1/4" (M6) Counterbores, 50 mm Long
XT66C2140 mm Long Double Dovetail Clamp for 66 mm Rails
XT66-500166 mm Construction Rail, L = 500 mm
SH6MS101M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, 25 Pack
XT66D2-50 Holds Two Post Holders at Once

XT66 Mounting Platforms come in either 40 mm or 50 mm lengths. The 40 mm version (XT66D2-40) contains a single 1/4" (M6) counterbore and is perfectly sized to match our XT66C2 Double Dovetail Clamp. In contrast, the 50 mm version (XT66D2-50), pictured at right, contains three 1/4" (M6) counterbores. It allows three components mounted directly on Ø1/2" Posts or two components mounted with Ø1/2" Post Holders to be placed in close proximity.

The counterbored holes in these parts accept standard cap screws.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
XT66D2-40 Support Documentation
XT66D2-40Mounting Platform, One 1/4" (M6) Counterbore, 40 mm Long
$16.23
5-8 Days
XT66D2-50 Support Documentation
XT66D2-50Mounting Platform, Three 1/4" (M6) Counterbores, 50 mm Long
$18.61
Today

Tapped Dovetails for 66 mm Rails

XT66DE1 Tapped Dovetail
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
ME1-M011Ø1" Protected Gold Mirror, 3.2 mm Thick
KM1001Kinematic Mirror Mount for Ø1" Optics
TR21Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
XT66DE111/4"-20 Tapped Dovetail for 66 mm Rails, 20 mm Long
XT66C1120 mm Long Double Dovetail Clamp for 66 mm Rails
XT66-100166 mm Construction Rail, L = 100 mm
SS25S05011/4"-20 Stainless Steel Setscrew, 1/2" Long, 25 Pack
View Metric Product List
Item #QtyDescription
Metric Product List
ME1-M011Ø1" Protected Gold Mirror, 3.2 mm Thick
KM1001Kinematic Mirror Mount for Ø1" Optics
TR50/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
XT66DM11M6 Tapped Dovetail for 66 mm Rails, 20 mm Long
XT66C1120 mm Long Double Dovetail Clamp for 66 mm Rails
XT66-100166 mm Construction Rail, L = 100 mm
SS6MS121M6 x 1.0 Stainless Steel Setscrew, 12 mm Long, 25 Pack
Tapped Dovetails are Ideal Mounts for Single Components
  • Includes One 1/4"-20 (M6) Tapped Hole
  • Fastened to Rail with Dovetail Clamps

Our Tapped Dovetails hold a single optomechanical component to a 66 mm rail system. As shown to the right, they are perfectly sized to be attached to an XT66 rail by using an XT66C1 Double Dovetail Clamp.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
XT66DE1 Support Documentation
XT66DE11/4"-20 Tapped Dovetail for 66 mm Rails, 20 mm Long
$11.03
Today
+1 Qty Docs Part Number - Metric Price Available
XT66DM1 Support Documentation
XT66DM1M6 Tapped Dovetail for 66 mm Rails, 20 mm Long
$11.03
Today

Slotted Dovetails for 66 mm Rails

app shot
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
POLARIS-K11Polaris® Ø1" Mirror Mount, 3 Adjusters
XT66-200166 mm Construction Rail, L = 200 mm
XT66C2140 mm Long Double Dovetail Clamp for 66 mm Rails
XT66D21Slotted Dovetail with One Z-Axis Counterbored Slot, 50 mm Long
RS11Ø1" Pillar Post, 1/4"-20 Taps, L = 1", 8-32 Adapter Included
SH25LP3811/4"-20 Low-Profile Channel Screws (100 Screws/Box)
View Metric Product List
Item #QtyDescription
Metric Product List
POLARIS-K11Polaris® Ø1" Mirror Mount, 3 Adjusters
XT66-200166 mm Construction Rail, L = 200 mm
XT66C2140 mm Long Double Dovetail Clamp for 66 mm Rails
XT66D21Slotted Dovetail with One Z-Axis Counterbored Slot, 50 mm Long
RS25/M1Ø25.0 mm Pillar Post, M6 Taps, L = 25 mm, M4 Adapter Included
SH6M10LP1M6 x 1.0 Low-Profile Channel Screws (100 Screws/Box)
Slotted Dovetail Locked by XT66C2 Double Dovetail Clamp
  • XT66D2: One 1/4" (M6) Counterbored Slot Along Length
  • XT66D3: Three 1/4" (M6) Counterbored Slots Across Width
  • Fastened to Rail with Dovetail Clamps
  • Used with Low-Profile Channel Screws or Low-Profile T-Nuts, Sold Below

These 50 mm long dovetail sections contain one or three counterbored slots that provide flexible mounting options along the X or Z axes. The XT66D2's counterbored slot is parallel to the rail axis, while the XT66D3's three counterbored slots lie across the rail width. The XT66D3 additionally includes two Ø1/8" holes positioned to accept the dowel pins on translation stages like the MT1 Single-Axis Translation Stage.

Since these mounting dovetails have minimal height, their counterbored slots are too shallow to accommodate standard 1/4"-20 or M6 cap screws. We therefore recommend that either Low-Profile Channel Screws or Low-Profile T-Nuts are used instead (see below for details).

Shown above and to the right is a POLARIS-K1 mounted on a standard 66 mm rail with a pillar post. The pillar post can be coarsely positioned along the counterbored slot before being locked down.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
XT66D2 Support Documentation
XT66D2Slotted Dovetail with One Z-Axis Counterbored Slot, 50 mm Long
$16.23
Today
XT66D3 Support Documentation
XT66D3Slotted Dovetail with Three X-Axis Counterbored Slots, 50 mm Long
$18.61
Today

Clamping Platform for 66 mm Rails

XT66C4 Clamping Platform
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
XT66-100166 mm Construction Rail, L = 100 mm
XT66C41Clamping Platform for 66 mm Rails, 1/4" Counterbored Slot, 40 mm Long
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR1.51Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
SH25S03811/4"-20 Stainless Steel Cap Screw, 3/8" Long, 25 Pack
GM1001Ø1" Gimbal Mirror Mount, Imperial, One Retaining Ring Included
PF10-03-M011Ø1" Protected Gold Mirror
View Metric Product List
Item #QtyDescription
Metric Product List
XT66-100166 mm Construction Rail, L = 100 mm
XT66C41Clamping Platform for 66 mm Rails, 1/4" Counterbored Slot, 40 mm Long
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR40/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 40 mm
SH6MS101M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, 25 Pack
GM100/M1Ø25.4 mm Gimbal Mirror Mount, Metric, One Retaining Ring Included
PF10-03-M011Ø1" Protected Gold Mirror
Fastens to Base Rail without Additional Clamps
  • Contains One 1/4" (M6) Counterbored Slot
  • Slides Along Rail Side Prior to Lockdown
  • Locking Screws Fasten with 2.5 mm Balldriver or Hex Key

The XT66C4 Clamping Platform contains a single 1/4" (M6) counterbored slot that is parallel to the rail axis and directly fastens to a 66 mm rail using two side-mounted screws that lock with a 2.5 mm balldriver or hex key. The counterbored slot accepts standard cap screws. This clamp is also offered without the counterbored slot (see immediately below) for customers who prefer custom mounting options.

For applications requiring fine translation of the clamping platform, Thorlabs manufactures the XT66N Rail Platform Positioner.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
XT66C4 Support Documentation
XT66C4Clamping Platform for 66 mm Rails, 1/4" Counterbored Slot, 40 mm Long
$30.30
Today

Blank Clamping Platform for 66 mm Rails

  • Blank Platform for Designing Custom Mounting Options
  • Slides Along Rail Side Prior to Lockdown
  • Locking Screws Fasten with 2.5 mm Balldriver or Hex Key

The XT66C5 Blank Clamping Platform is for customers who would like custom mounting options for a 66 mm rail assembly. It is identical to the XT66C4 Clamping Platform sold immediately above, but contains no 1/4" (M6) counterbored slot. This platform's aluminum construction features a durable, clear anodized coating. The machinable area of the platform, which is shaded in the diagram to the right, is constrained by the width of the bottom relief cut and the threading depth of the two side-mounted locking screws.

For applications requiring fine translation of the clamping platform, Thorlabs manufactures the XT66N Rail Platform Positioner.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
XT66C5 Support Documentation
XT66C5Customer Inspired! Clamping Platform for 66 mm Rails, Blank, 40 mm Long
$30.30
Today

Counterbored Pivot Platform for 66 mm Rails

XT66RC Clamp Holding Mirror Mount
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
XT66-100166 mm Construction Rail, L = 100 mm
GM1001Ø1" Gimbal Mirror Mount, Imperial, One Retaining Ring Included
PF10-03-M011Ø1" Protected Gold Mirror
XT66RC1Counterbored Pivot Platform for 66 mm Rails
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
SH25LP3811/4"-20 Low-Profile Channel Screws (100 Screws/Box)
TR1.51Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
View Metric Product List
Item #QtyDescription
Metric Product List
XT66-100166 mm Construction Rail, L = 100 mm
GM100/M1Ø25.4 mm Gimbal Mirror Mount, Metric, One Retaining Ring Included
PF10-03-M011Ø1" Protected Gold Mirror
XT66RC1Counterbored Pivot Platform for 66 mm Rails
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
SH6M10LP1M6 x 1.0 Low-Profile Channel Screws (100 Screws/Box)
TR40/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 40 mm
Counterbored Slot Accepts Standard Optomechanical Parts
  • Rounded Dovetail Shape Allows Any Orientation Between Rail and Mounted Component
  • Contains One Counterbored Slot Compatible with 1/4"-20 (M6) Low-Profile Channel Screws and Low-Profile T-Nuts
  • Locking Screws Fasten with 2.5 mm Balldriver or Hex Key

The XT66RC Counterbored Pivot Platform contains a rotatable counterbored slot that accepts 1/4"-20 (M6) optomechanics. Due to this platform's compact profile, the counterbored slot is too shallow to accommodate standard 1/4"-20 or M6 cap screws. We therefore recommend that either Low-Profile Channel Screws or Low-Profile T-Nuts, sold below, are used instead.

Alternatively, this platform can be used to mount a second rail to a base rail at an arbitrary angle in combination with a Double Dovetail Clamp.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
XT66RC Support Documentation
XT66RCCounterbored Pivot Platform for 66 mm Rails
$74.94
Today

Low-Profile Channel Screws and T-Nuts for 66 mm Rails

Low-Profile T-Nut in Counterbored Slot
Click to Enlarge

Low-Profile T-Nut in Counterbored Slot
Low-Profile Channel Screw in Counterbored Slot
Click to Enlarge

Low-Profile Channel Screw in Counterbored Slot
Standard Cap Screw Protrudes from Counterbored Slot
Click to Enlarge

Standard Cap Screw Protrudes from Counterbored Slot

Our 1/4"-20 (M6) Low-Profile Channel Screws and Low-Profile T-Nuts have a slim profile that permits them to be used in tight spaces. In particular, they are recommended for use with our XT66RC Counterbored Pivot Platform and XT66D2 and XT66D3 Slotted Dovetails, whose counterbore depths are too shallow to accommodate standard cap screws.

Shown to the right are a standard cap screw, a low-profile channel screw, and a low-profile T-Nut in an XT66D2 Slotted Dovetail. The short height of the channel screw and T-Nut prevents them from interfering with an attached Dovetail Clamp.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
SH25LP38 Support Documentation
SH25LP381/4"-20 Low-Profile Channel Screws (100 Screws/Box)
$25.10
Today
XE25T3 Support Documentation
XE25T3Low-Profile T-Nut, 1/4"-20 Tapped Hole, Qty: 10
$10.61
Today
+1 Qty Docs Part Number - Metric Price Available
SH6M10LP Support Documentation
SH6M10LPM6 x 1.0 Low-Profile Channel Screws (100 Screws/Box)
$25.10
Today
XE25T3/M Support Documentation
XE25T3/MLow-Profile T-Nut, M6 Tapped Hole, Qty: 10
$10.61
Today

Counterbore Adapter Rings

Assembled View
Click to Enlarge

Assembled View
Exploded View
Click to Enlarge

Exploded View of SD1 Counterbore Adapter Ring with XT66D2-40
  • Use an 8-32 (M4) Cap Screw in a 1/4" (M6) Counterbore
  • Sold in Packages of 10
  • Does Not Provide 8-32 Compatibility for Parts that Use Low-Profile Channel Screws or Low-Profile T-Nuts

The SD1 Adapter Ring allows an 8-32 (M4) cap screw to be used within a 1/4" (M6) counterbore. It is made of stainless steel and enables a wide variety of 8-32 threaded optomechanical components, such as our LMR Fixed Optic Mounts, to be directly mounted on an XT66 mounting platform without a post or post holder, as shown to the right.

Please note that these adapter rings cannot be used with the XT66D2 or XT66D3 Slotted Dovetails or the XT66RC Counterbored Pivot Platform because there is insufficient depth in the counterbore to accommodate both the adapter ring and a cap screw.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SD1 Support Documentation
SD11/4" (M6) Counterbore Adapter Ring for 8-32 (M4) Screws, 10 Pack
$8.39
Today
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Last Edited: Aug 29, 2013 Author: Dan Daranciang