Rail Joiner for 25 mm, 50 mm, and 75 mm Rails

  • Extend Existing Rail Segments
  • One Piece per Channel Ensures Straight Alignment
  • Compatible with 25 mm, 50 mm, and 75 mm Rails


Slides into Place

Four Installed Pieces

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Recommended Installation Procedure

Rail Compatibility
Rail Size # of Rail Joiner
Pieces Required
25 mm x 25 mm 4 (1 Set)
50 mm x 50 mm 8 (2 Sets)
50 mm x 75 mm 10 (3 Sets)
75 mm x 75 mm 12 (3 Sets)


  • One Set Links Two 25 mm Rail Sections End to End
  • Multiple Sets Required for 50 mm, 75 mm, and 50 x 75 mm Rails
  • 2.5" Length Fits Inside the Rail Channels
  • Sold in Packs of Four

The XE25J Rail Joiner provides a stable means of attaching two 25 mm, 50 mm, or 75 mm construction rails together end to end. It consists of four braces that are shaped to fit inside the rail channels. Note that multiple sets should be used for rails larger than 25 mm x 25 mm. When the 2.5" long braces are installed, the two locking screws on each brace can be secured with a 5/64" (2.0 mm) balldriver. All braces should be centered with respect to the seams to prevent the joined rails from flexing along any of the four sides.

The recommended installation procedure is shown in the animation to the right. To maintain a straight edge along both the X and Y axes, Thorlabs recommends that the rails are held against a hard corner while the rail joiner is tightened, as shown in the animation. Please note that the presence of the rail joiner will prevent the use of part of the rail channel.

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Rail Joiner for 25 mm, 50 mm, and 75 mm Rails

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
XE25J Support Documentation
XE25JRail Joiner for 25, 50, and 75 mm Rails, 4 Pieces