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25 mm Optical Construction Rails
1/4"-20 (M6) Tap
XE25 Series Rail
With a 25 mm x 25 mm profile, Thorlabs' XE25 Construction Rails are our most compact and lightweight option for building three-dimensional mechanical structures. They consist of extruded lengths of aluminum that feature channels on all four sides, as shown in the image at the top of the page. These channels make the rails mechanically compatible with other optomechanical components. For instance, by inserting T-Nuts into the channels, any 8-32 (M4) or 1/4"-20 (M6) optomechanical component can be fastened to the rail sides. The channels are also perfectly sized to hold enclosure panels made of black hardboard or plexiglass, as is done with our optical enclosures.
Our 25 mm rails are offered in pre-cut lengths from 9" to 48" (225 to 1200 mm) and are finished with a durable, black anodized coating. The centered 1/4"-20 (M6) tapped hole on both ends allows the rail to be mounted directly to a breadboard or optical table. Upon request, we can provide these anodized rails in custom lengths from 2.5" to 79" (50 to 2000 mm), or we can provide the raw rail extrusion in lengths up to 3 m (9.8'). For material properties including mass per meter, cross-sectional area, and second moment of area, please refer to the Engineering Specs tab.
Thorlabs' accessories for assemblies made of 25 mm rails include corner cubes and brackets, T-nuts, low-profile channel screws, breadboard mounting accessories, rail joiners, and a channel insert. In addition, we offer optical enclosures, enclosure accessories, and "do-it-yourself" tools like taps, tap guides, and drill guides for home-built XE25-based constructions.
Our 25 mm rails have rail channels on all four sides for use in one-, two-, or three-dimensional constructions. These channels feature 6.5 mm openings and accept T-Nuts, rail joiners, and enclosure panels. Each rail end is tapped with a 1/4"-20 (M6 x 1.0) hole for compatibility with standard optomechanics.
The pre-cut rails are offered from stock in lengths ranging from 9" to 48" (225 mm to 1200 mm), with a tolerance of ±0.006" (±150 µm). If our pre-cut lengths do not suit your application, custom lengths from 2.5" - 79" (50 mm - 2000 mm) can be ordered by using the XE25-CUSTRAIL(/M) field in the price box below or contacting Technical Support.
As shown in the family image at the top of the page, metric rails are denoted by a small hole on one side of the extrusion, next to the M6 tapped hole.
The XE25RL2 is an unanodized, rough-cut extrusion for customers who prefer to machine and finish their own rails. The center hole of the extrusion can be 1/4"-20 or M6 tapped without additional machining. Its aluminum construction makes it easy to machine in your own machine shop.