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Low-Profile Channel Screws and T-Nuts


  • Low-Profile Channel Screws Feature Reduced Cap Height
  • T-Nuts Accept 8-32, 1/4"-20, M4, or M6 Threaded Optomechanics

XE25T1

XE25T2

XT95N6

XE25T3

XE25T4

XT95N4

SH25LP38

Drop-In T-Nut Fits into 95 mm Rail T-Slot

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Our Low-Profile Channel Screws and T-Nuts are designed for our 25 mm and 95 mm optical rail systems, but are also useful in applications where space is at a premium.


Posted Comments:
weikeaep  (posted 2017-09-10 10:17:12.65)
For the Low-Profile Channel Screws,only one standard is provided, could you have more options? 10mm screws is too long for me, can you provide shorter one? Such as 6 mm or 5mm.
tfrisch  (posted 2017-09-20 04:19:06.0)
Hello, thank you for contacting Thorlabs. I will contact you directly about your request for shorter low-profile screws.

Low-Profile Channel Screws

Low-Profile Channel Screw
Click to Enlarge

Low-Profile Screw in RM1G Construction Cube
Standard Cap Screw
Click to Enlarge

Standard Cap Screw in RM1G Construction Cube

Item # Threading Hex Head Height Length Material Quantity
SH25LP38 1/4"-20 1/8" 0.13" (3.2 mm) 0.34" (8.6 mm) Steel 100
SH6M10LP M6  4 mm 4 mm (0.16") 10 mm (0.39")

Our Low-Profile Channel Screws have a reduced cap head height relative to standard screws, permitting them to be used in tight spaces. In particular, they are recommended when neighboring screws are at a right angle and in close proximity, as in our XE25W3 Corner Cube or RM1G and RM1S Construction Cubes.

Shown to the right are a standard cap screw and a low-profile channel screw installed in an RM1G cube. The low-profile screw's shortened cap height prevents neighboring screws from interfering with each other.

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
+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

Quick-Release T-Nuts for 25 mm Rails

Quick-Release T-Nut Insertion and Removal
XE25T4 in Rail Channel
Click for Details

Quick-Release T-Nut in Rail Channel
  • Can Be Inserted and Removed from Any Exposed Portion of a Rail Channel Without Accessing the Ends, as Shown in the Animation to the Right
  • Drops into Position and Locks by Rotating
  • More Surface Engagement than Drop-In and Low-Profile T-Nuts
  • 8-32 (M4) Tapped Hole for Mounting

The XE25T4(/M) Quick-Release T-Nut is our most versatile option for mounting mechanics to 25 mm rails. Its thin width profile allows it to be inserted into an exposed rail channel. After being inserted, a clockwise rotation by 90° prevents it from being removed again. Once rotated, screwing in a mechanical part draws the T-Nut away from the rail's center axis, eventually forcing the T-Nut and rail channel to engage. The protruding edge of the 8-32 (M4) tapped hole centers the T-Nut within the rail channel, ensuring even engagement on both sides.

To remove the Quick-Release T-Nut, simply remove any attached mechanical parts and rotate the T-Nut counterclockwise.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
XE25T4 Support Documentation
XE25T4Self-Centering Quick-Release T-Nut, 8-32 Tapped Hole, Qty: 10
$25.43
Today
+1 Qty Docs Part Number - Metric Price Available
XE25T4/M Support Documentation
XE25T4/MSelf-Centering Quick-Release T-Nut, M4 Tapped Hole, Qty: 10
$25.43
Today

Drop-In T-Nuts for 25 mm Rails

Drop-In T-Nut Insertion and Removal
XE25T2 in Rail Channel
Click for Details

Drop-In T-Nut in Rail Channel
  • Can Be Dropped into Any Exposed Portion of a Rail Channel Without Accessing the Ends
  • Removal Requires Access to the Rail Ends
  • 8-32 (M4) Tapped Hole or 1/4"-20 (M6) Tapped Hole for Mounting

Drop-In T-Nuts can be dropped in along any point of an exposed rail channel, making them easy to install even if the rail ends are blocked. They are available with either an 8-32 (M4) tapped hole [Item # XE25T2(/M)] or 1/4"-20 (M6) tapped hole [Item # XE25T1(/M)].

Although these T-Nuts can be easily inserted anywhere along the rail, access to the end of the rail is necessary for removal. This procedure is shown in the animation to the right. In contrast, our Quick-Release T-Nuts, shown above, offer the added flexibility of being able to be removed when the rail ends are obstructed.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
XE25T2 Support Documentation
XE25T2Drop-In T-Nut, 8-32 Tapped Hole, Qty: 10
$31.12
Today
XE25T1 Support Documentation
XE25T1Drop-In T-Nut, 1/4"-20 Tapped Hole, Qty: 10
$31.12
Today
+1 Qty Docs Part Number - Metric Price Available
XE25T2/M Support Documentation
XE25T2/MDrop-In T-Nut, M4 Tapped Hole, Qty: 10
$31.12
Today
XE25T1/M Support Documentation
XE25T1/MDrop-In T-Nut, M6 Tapped Hole, Qty: 10
$31.12
Today

Low-Profile T-Nuts for 25 mm Rails

Low-Profile T-Nut Insertion and Removal
XE25T2 in Rail Channel
Click for Details

Low-Profile T-Nut in Rail Channel
  • Can Only Be Inserted and Removed from the End of a Rail
  • 1/4"-20 (M6) Tapped Hole for Mounting
  • Economical Alternative to Drop-In and Quick-Release T-Nuts

The XE25T3(/M) Low-Profile T-Nut can be used when there is access to the rail end, which allows the T-Nut to slip into place. Since installation (and removal) requires the rail end to be unobstructed, as shown in the animation to the right, this T-Nut usually needs to be positioned before an XE25-based mechanical construction is completed.

Our Quick-Release and Drop-In T-Nuts, shown above, can be inserted even if the rail ends are blocked; the former can also be removed without access to the ends.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
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
XE25T3/M Support Documentation
XE25T3/MLow-Profile T-Nut, M6 Tapped Hole, Qty: 10
$10.61
Today

Low-Profile T-Nuts for 95 mm Rails

View Product List
Item #QtyDescription
KM2001Kinematic Mirror Mount for Ø2" Optics
PF20-03-G011Ø2" Protected Aluminum Mirror
LMR2/M1Lens Mount with Retaining Ring for Ø2" Optics, M4 Tap
LA1401-A1N-BK7 Plano-Convex Lens, Ø2", f = 60.0 mm, AR Coating: 350 - 700 nm
TR50/M2Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
KMCP/M2Kinematic Mount Centering Plate, Metric
XT95SP-500195 mm One-Sided Construction Rail, Clear Anodized, L = 500 mm
XT95N61Low-Profile T-Nut for 95 mm Rails, M6 Tapped Hole, Qty: 10
Post-Mounted Optomechanics on a Rail Side
Low-Profile T-Nut in T-Slot
Click for Details

Low-Profile T-Nut in T-Slot
  • Can Only be Inserted and Removed from the End of a Rail
  • M6 Tapped Hole for Mounting

The XT95N6 Low-Profile T-Nut slips into the T-Slots along the rail side. Since installation (and removal) requires the rail end to be unobstructed, this T-Nut usually needs to be positioned before a 95 mm rail assembly is completed. In contrast, the Drop-In T-Nut shown below can be installed and removed even if the rail ends are blocked.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
XT95N6 Support Documentation
XT95N6Low-Profile T-Nut for 95 mm Rails, M6 Tapped Hole, Qty: 10
$27.06
Today

Drop-In T-Nuts for 95 mm Rails

T-Nut Inserted
Click for Details
Rotating the Drop-In T-Nut clockwise keeps it in place.
T-Nut Installation
Click for Details
To insert a Drop-In T-Nut, turn the long side parallel to the T-Slot and drop it in.
  • Can be Inserted and Removed from Any Exposed Portion of a T-Slot Without Access to the Rail Ends
  • M4-Tapped Hole for Mounting

The XT95N4 Drop-In T-Nut has a thin width profile that allows it to be inserted into an exposed T-Slot. After being inserted, a clockwise rotation by 90° prevents it from being removed again. The protruding edge of the M4-tapped hole helps to center the T-Nut within the T-Slot.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
XT95N4 Support Documentation
XT95N4Drop-In T-Nut for 95 mm Rails, M4 Tapped Hole, Qty: 10
$24.35
Today
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