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Quick-Release Cage Plates for 60 mm Cage System

  • Release Mechanisms: Magnetic or Spring Loaded
  • SM2-Threaded Mounts for Ø2" Optics
  • Insert or Remove from Assembled Cage Systems





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Alternative Size Options
16 mm Quick-Release Cage Mounts
30 mm Quick-Release Cage Mounts
60 mm Quick-Release Cage Mounts


  • Compatible with 60 mm Cage Systems
  • Easily Insert or Remove Components From a Cage System Without Disassembling the Structure
  • Accepts Ø2" (50.8 mm) Optics
  • SM2 (2.035"-40) Internal Thread Directly Compatible with Our SM2-Series Components

The LCP90F has a removable mounting carriage that magnetically couples to the back plate of the mount, which is not removable from the cage structure. The advantage to this mount is that the mounting carriage with the component mounted in it can be removed and reinserted into the cage system with a high degree of repeatability.

The QRC2A uses a spring-loaded dovetail clamping mechanism that allows the cage plate to be easily inserted or removed from a closed cage system. The primary advantage of this mount is that it can be removed from the cage system and reinserted into the cage system on the other side of a component that is fixed in the cage structure.

Cage System Compatibility: Thorlabs offers 16 mm, 30 mm, and 60 mm cage systems designed for Ø1/2", Ø1", and Ø2" optical components, respectively. The parts on this page are compatible with our 60 mm cage system and utilize Ø6 mm ER cage rods.

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 accomodate 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 (2.8")
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
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.

Posted Comments:
mkarakose  (posted 2016-04-25 14:20:54.563)
Can you merge QRC2A with SLC60C self centering 60mm cage mount. At present QRC2A accepts only 2" outer threaded components, but if you can merge those two it would accept any component smaller than 2", and it would have quick release property. You can do this for other quick-release components also. Thank you.
besembeson  (posted 2016-04-25 09:42:09.0)
Response from Bweh at Thorlabs USA: Thanks for your feedback. We will review this idea.

60 mm Cage Plate, Quick Release Magnetic Plate

LCP90F Application
Click to Enlarge
LCP90F Quick Release Magnetic Plate Shown in 60 mm Cage System
  • 60 mm Cage Compatible Back Plate
  • Magnetically Coupled Mounting Carriage
  • Accepts Ø2" (50.8 mm) Optics Up to 0.345" (8.7 mm) Thick
  • Angular Repeatability Better Than 1 µrad
  • Lateral Repeatability Better Than 10 µm in X, Y, and Z
  • Back Plate and Mounting Carriage Have Internal SM2 Threading
  • One Retaining Ring (SM2RR) Included for Mounting 2" Optics

The LCP90F consists of a back plate compatible with the 60 mm cage system and a mounting carriage (front plate) that is magnetically coupled with pairs of rare earth magnets to the back plate. For stability, precision, and repeatability, the mounting carriage contacts the back plate at three points. Each point of contact is a ball bearing on the mounting carriage resting in the groove formed by two parallel steel pins. Since the axes defined by the three sets of pins share a common point of intersection, the system is properly constrained (kinematic). The mounting carriage can be easily inserted or removed from the fully assembled cage system by separating it from the back plate, rotating it sideways, and then extracting it from the cage.

The internal SM2 threading allows components up to 0.345" (8.7 mm) thick to be secured in the mounting carriage with the included SM2RR retaining ring. Components with external SM2 threading (OD = 2.2" (55.9 mm)) cannot extend more than 1" (25.4 mm) beyond the face of the mounting carriage without sacrificing the ability to remove the mounting carriage and component from a closed cage system. The lateral repeatability specification (10 µm) indicates that the X, Y, and Z position of the mount will not vary by more than 10 µm after being removed and replaced, while the 1 µrad angular repeatability refers to the rotation of the optic not changing by more than 1 µrad.

Both the LCP90F and LCP90F-B have four cage rod through holes that are accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LCP90F Support Documentation
LCP90F60 mm Removable Cage Plate
LCP90F-B Support Documentation
LCP90F-B60 mm Removable Cage Plate - Back
LCP90F-F Support Documentation
LCP90F-F60 mm Removable Cage Plate - Front

60 mm Cage Mount with Quick-Release Clamp

  • Compatible with 60 mm Cage Systems
  • Internal SM2 Threading
  • Dovetail Design Provides Smooth Release and Clamping Action
  • One-Handed Operation for Removal and Repositioning of an Optic
  • Accepts Ø2" (Ø50.8 mm) Optics Up to 0.15" (3.8 mm) Thick
  • One Retaining Ring (SM2RR) Included for Mounting 2" Optics

The QRC2A cage mount is equipped with a spring-loaded dovetail clamp that secures or releases the cage mount to two of the four ER rods in the cage structure. The cage plate has internal SM2 threading that allows for components up to 0.15" (3.8 mm) thick to be secured with the included SM2RR retaining ring. In addition, components up to 1" (25.4 mm) thick [not including length of threaded stub, OD = 2.2" (55.9 mm)] with external SM1 threading can be attached without sacrificing the ability to remove the cage plate from a closed cage system.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
QRC2A Support Documentation
QRC2ASM2-Threaded Quick-Release Cage Mount for the 60 mm Cage System
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