Adjustable Height Cage Clamps

  • V-Block and Flat Platform
  • Lockable, Height-Adjustable Rotating Platform
  • Rotating V-Shaped Clamping Head



V-Block Platform, 360° Rotation

Flat Platform, 360° Rotation

Ideal for


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ARV1F Adjustable Height Cage Clamp Mounted within a 30 mm Cage System


  • Lockable, Height Adjustable Rotating Pedestal
  • Includes V-Groove and Flat Mounting Surfaces
  • V-Groove Holds Cylindrical Objects from Ø0.15" (Ø3.8 mm) to Ø0.59" (Ø15.0 mm)
  • Flat Mounting Platform Translates 0.60" (15.2 mm)

This cage clamp provides flexible adjustments within our 30 mm cage assemblies. Both the top and bottom of the mount assembly can be independently translated along the Ø6 mm Cage Assembly Rods and locked in place using side-located M4 x 0.7 setscrews. The included flat and V-groove platforms offer additional flexibility with lockable height and rotation adjustment. A top-located thumbscrew, complete with a swiveling Delrin®* tip, provides the fastening force required to securely hold optical components in place. The setscrews used to lock the cage rods and platform in position, as well as the top-located thumbscrew, can all be adjusted using a 5/64" (2.0 mm) ball driver or hex key.

*Delrin® is a registered trademark of DuPont Polymers, Inc.

Cage System Overview

The Cage Assembly System provides a convenient way to construct large optomechanical systems with an established line of precision-machined building blocks designed for high flexibility and accurate alignment.

16 mm, 30 mm, and 60 mm Cage System Standards

Thorlabs offers three standards defined by the center-to-center spacing of the cage assembly rods (see image below). The 16 mm cage, 30 mm cage, and 60 mm cage standards are designed to accommodate Ø1/2", Ø1", and Ø2" optics, respectively. Specialized cage plates that allow smaller optics to be directly inserted into our larger cage systems are also available.

Standard Threads

The flexibility of our Cage Assembly System stems from well-defined mounting and thread standards designed to directly interface with a wide range of specialized products. The three most prevalent thread standards are our SM05 Series (0.535"-40 thread), SM1 Series (1.035"-40 thread), and SM2 Series (2.035"-40 thread), all of which were defined to house the industry's most common optic sizes. Essential building blocks, such as our popular lens tubes, directly interface to these standards.

An example of the standard cage plate measurements determining cage system compatibility.
Standard Cage System Measurements
Cage System 16 mm 30 mm 60 mm
Thread Series SM05 SM1 SM2
Rod to Rod Spacing 16 mm (0.63") 30 mm (1.18") 60 mm (2.36")
Total Length 25 mm (0.98") 41 mm (1.60") 71.1 mm (2.80")
Cage Components
Cage Rods 16 mm These rods are used to connect cage plates, optic mounts, and other components in the cage system. The SR Series Cage Rods are compatible with our 16 mm cage systems, while the 30 mm and 60 mm cage systems use ER Series Cage Rods.
30 mm
60 mm
Cage Plates 16 mm These serve as the basic building blocks for a cage system. They may have SM-threaded central bores, smooth bores sized for industry standard optics or to accommodate the outer profile of our SM Series Lens Tubes, or specialized bores for other components such as our FiberPorts.
30 mm
60 mm
Optic Mounts 16 mm Thorlabs offers fixed, kinematic, rotation, and translation mounts specifically designed for our Cage Systems.
30 mm
60 mm
Cage Cubes 16 mm These cubes are useful for housing larger optical components, such as prisms or mirrors, or optics that need to sit at an angle to the beam path, such as beamsplitters. Our cage cubes are available empty or with pre-mounted optics.
30 mm
60 mm
Replacement Setscrews Replacement setscrews are offered for our 16 mm (SS4B013, SS4B025, and SS4B038) and 30 mm (SS4MS5 and SS4MS4) cage systems products.
Post and Breadboard Mounts and Adapters Mounting options for cage systems can be found on our Cage System Construction pages. Cage Systems can be mounted either parallel or perpendicular to the table surface.
Size Adapters Cage System Size Adapters can be used to integrate components from different cage system and threading standards.
Specialized Components Thorlabs also produces specialized cage components, such as Filter Wheels, a HeNe Laser Mount, and a FiberPort Cage Plate Adapter, allowing a wide range of our products to be integrated into cage-mounted optical systems. Explore our Cage Systems Visual Navigation Guide to see the full range of Thorlabs' cage components.

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ARV1F Support Documentation
ARV1FRotatable Cage Mount, V-Groove and Flat Platforms