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XT34 34 mm Optical Construction Rails
Thorlabs' XT34 Optical Rails provide the building blocks necessary for constructing stable, rigid, three-dimensional mechanical assemblies. They consist of extruded lengths of aluminum with a dovetail mounting surface that allows rails to be joined to each other, breadboards, or other optomechanical assemblies. Mounted objects can easily traverse the full length of these dovetails without interruption. The 34 mm rail series includes rails that have the dovetail on one, two, or four sides, as shown in the photos at the top of the page. These dovetail rails feature either a clear or a black anodized coating.
The standard four-sided clear anodized rails measure 34 mm to a side and are available from stock in lengths ranging from 200 to 1000 mm. Upon request, we can ship these rails in custom lengths from 50 mm to 2000 mm. The standard four-sided rails are also offered in a raw extrusion length of 2 m (6.6').
We offer two-sided rails with clear anodization in lengths of 100 or 500 mm from stock.
The single dovetail rails have a compact design that provides additional mounting flexibility when constructing optical rail systems. Thorlabs offers 500 mm and 1000 mm long rails with a durable clear anodized finish. They do not include counterbored holes for mounting or an engraved scale. We also offer one-sided rails that include counterbores for mounting to an optical table without the need for clamps. These counterbored rails have a black anodized finish and an engraved scale in 1 mm increments for precise and repeatable positioning along the length of the rail. They are available in lengths from 250 mm to 750 mm.
Thorlabs offers a wide and growing complement of accessories for 34 mm rails, including clamps and angle brackets, breadboard mounts, rail carriers, mounting platforms, lens tube adapters, and rail joiners. Together with size adapters that incorporate 66 mm and 95 mm rails into an XT34 setup, these tools provide a complete family of rigid, versatile building blocks suited for virtually any optomechanical setup.
Our standard 34 mm Construction Rails have a dovetail mounting surface on all four sides for use in one-, two-, or three-dimensional constructions. Objects can be slid along the dovetail before being clamped into place. The rail ends are tapped with four M3 holes for mounting lens tube adapters, mounting plates, or rail joiners.
These rails are offered in stock lengths of 200 mm, 500 mm, and 1000 mm. If our pre-cut lengths do not suit your application, custom lengths from 50 mm - 2000 mm can be ordered by using the XT34-CUSTRAIL field in the price box below or contacting Technical Support.
These are also offered as a rough-cut, unanodized extrusion (see below) for our customers who prefer to machine and finish the rails themselves.
The XE34RL2 is an unanodized, rough-cut extrusion for customers who prefer to machine and finish their own rails. The rail’s unanodized aluminum construction enables easy custom machining.
Upon request, we can provide this extrusion in lengths up to 3.5 m (11.5'). Please contact Technical Support for a quote.
The XT34DP-500's double dovetail design allows two 34 mm construction rails to be coupled together using dovetail clamps. In particular, this enables optical assemblies to be coupled to a base rail and moved as a complete sub-assembly.
The XT34SP-500 rail and XT34SD series of rails each have a compact, single dovetail design that provides additional mounting flexibility when constructing optical rail systems. The XT34SP-500 is
The XT34SD series ranges from 250 mm to 750 mm in length and has a black anodized finish. These rails include 1 to 5 central 1/4" (M6) counterbored holes and 4 to 12 surrounding 1" long, 1/4" (M6) counterbored slots for direct mounting to an optical table with a metric or imperial hole pattern. A schematic diagram showing mounting hole locations can be downloaded by clicking on the red icon to the left of each part number below. When our SH25LP38 Low-Profile Cap Screws are used, as shown in the image to the far right, full uninterrupted travel along the length of the rails is possible. A scale with 1 mm increments is engraved along the length of each XT66SD rail for precise and repeatable positioning.
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When mounted on the XRN25DR2 extended baseplate, the XRN25C stage's translation axis is perpendicular to the adjustment axis of the baseplate.
These baseplates feature a central rail for use with our 34 mm construction accessories. Additionally, the outer edges of the rail create a 2” dovetail, which is compatible with our XRN25 translation stages.
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Note: Mirror Not Included in Product Lists
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When mounted on the XR25DR extended baseplate, the XR25C stage's translation axis is perpendicular to the adjustment axis of the baseplate.
These baseplates feature a central rail for use with our 34 mm construction accessories. Additionally, the outer edges of the rail create a 3” dovetail, which is compatible with our XR25 and XR50 translation stages.
A mounted component can be translated across the entire length of the baseplate. The XR25DR2, XR25DR, and XR25DR3 are offered in lengths of 150 mm, 250 mm, and 500 mm, respectively. For XR25 and XR50 stages, travel along the rail would be in the direction orthogonal to the stage's translation axis.
The baseplates feature 1" long 1/4" (M6) counterbored mounting slots and a central 1/4" (M6) counterbored mounting hole that allow the rail to be used with both imperial and metric breadboard hole patterns. Standard cap screws can be used with this baseplate without interrupting the translation of mounted components.