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Cage System Filter Wheels


  • Available for 16 mm, 30 mm, and 60 mm Cages
  • Wheels Index to Each Filter
  • Lens Tube Compatible Entry and Exit Ports

Application Idea

LCFW5

with Ø2" Absorptive ND Filters

CFW6

30 mm Cage 
Compatible

SCFW6

16 mm Cage 
Compatible

LCFW5

60 mm Cage 
Compatible

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Features

  • Quickly Rotate Wheel to Change Filters
  • Available for Ø1/2", Ø1", and Ø2" Filters
  • SM-Threaded Through Port for Lens Tube Compatibility
  • Filter Wheel Slots are SM05, SM1, or SM2 Threaded
  • Retaining Rings Included
  • Post Mountable with Bottom Taps

Thorlabs offers cage filter wheels for its 16 mm, 30 mm, and 60 mm cage systems that are SM threaded to accept Ø1/2", Ø1", or Ø2" filters, respectively. Filters can be secured in the fix or six filter slots using the provided retaining rings. Thorlabs offers spanner wrenches for tightening the retaining rings. On each rotation of the filter wheel, a spring-loaded detent mechanism locks a filter into alignment with the bore that is centered along the cage system's mechanical axis. The centered bore is also SM threaded on both input and output ports to allow lens tubes to be connected to the main body. In addition, the bottoms of the filter wheels feature tapped holes that make them post mountable.

The 30 mm and 60 mm filter wheel designs allow the two bottom cage rods to pass through the entire mount, but the upper two cage rods must terminate at the filter wheel. In contrast, the 16 mm cage filter wheel requires that all cage rods terminate at the mount. The maximum thickness of the filters accepted by each wheel is given below.

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. All locking setscrews used in these cage plates are standard 4-40 setscrews, which use a 0.05" hex key.

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.

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16 mm Cage Filter Wheel for Ø1/2" Filters

  • Holds up to Six Ø1/2" (Ø12.7 mm) Filters
  • Maximum Filter Thickness: 0.19" (4.7 mm)
  • SM05-Threaded (0.535"-40) Through Ports on Main Body
  • Includes Six SM05RR Retaining Rings
  • Bottom Taps for Post Mounting

The SCFW6 is designed for our 16 mm cage system and has six SM05-threaded filter holders for Ø1/2" optics. The spring-loaded wheel features indents that click into place, centering the filter in the cage. The stationary input and output ports of the main body are also SM05-threaded for compatibility with our Ø1/2" lens tubes. Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" (1.3 mm) hex key. For compatibility with standard optomechanics, the bottom contains an 8-32 and an M4 tapped hole, as well as two 4-40 and two M3 x 0.5 tapped holes.

The filter wheel rotates around a 5/32" hex shoulder screw. The filter wheel can be removed by unscrewing the shoulder screw while gently holding the filter wheel. Lift out the filter wheel to easily add or remove filters, or to switch out for another 16 mm cage system filter wheel. To replace the filter wheel back into the main body, gently hold the wheel in place while reinserting and tightening the shoulder screw. To purchase additional filter wheels without the main body, please contact Tech Support.

Please note that while the two bottom cage rods may pass through the mount, they will prevent the filter wheel from rotating freely. The two top cage rods cannot pass through, due to obstruction by the filter wheel.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SCFW6 Support Documentation
SCFW616 mm Cage Filter Wheel for Six Ø1/2" Filters
$111.00
Today

30 mm Cage Filter Wheel for Ø1" Filters

  • Holds up to Six Ø1" (Ø25.4 mm) Filters
  • Maximum Filter Thickness: 0.25" (6.4 mm)
  • SM1-Threaded (1.035"-40) Through Ports on Main Body
  • Includes Six SM1RR Retaining Rings
  • Bottoms Taps for Post Mounting

The CFW6(/M) is designed for our 30 mm cage system and has six SM1-threaded filter holders for Ø1" optics. The spring-loaded wheel features indents that click into place, centering the filter in the cage. The stationary input and output ports of the main body are also SM1-threaded for compatibility with our Ø1" lens tubes. Each cage rod through hole is accompanied by a side-located locking 8-32 setscrew, which can be secured using a 5/64" (2.0 mm) hex key. For compatibility with standard optomechanics, the bottom of the imperial version has two 1/4"-20 and four 8-32 mounting holes, while the bottom of the metric version has two M6 and four M4 mounting holes.

The filter wheel rotates around a 3/16" hex shoulder screw that is locked in place by a nylon-tipped 5/64" hex setscrew located on the rear top of the main body. The filter wheel can be removed by first loosening the setscrew, and then removing the shoulder screw while gently holding the filter wheel. Lift out the filter wheel to easily add or remove filters, or to switch out for another 30 mm cage system filter wheel. To replace the filter wheel back into the main body, gently hold the wheel in place while reinserting the shoulder screw. Tighten the shoulder screw, and then retighten the 5/64" setscrew. To purchase additional filter wheels without the main body, please contact Tech Support.

Please note that while the two bottom cage rods may pass through the mount, the two top cage rods cannot, due to obstruction by the filter wheel.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
CFW6 Support Documentation
CFW630 mm Cage Filter Wheel for Six Ø1" Filters, 1/4"-20 and 8-32 Taps
$148.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
CFW6/M Support Documentation
CFW6/MNEW!30 mm Cage Filter Wheel for Six Ø1" Filters, M6 and M4 Taps
$148.00
Today

60 mm Cage Filter Wheel for Ø2" Filters

  • Holds up to Five Ø2" (Ø50.8 mm) Filters
  • Maximum Filter Thickness: 0.24" (6.0 mm)
  • SM2-Threaded (2.035"-40) Through Ports on Main Body
  • Includes Five SM2RR Retaining Rings
  • Bottom Taps for Post Mounting

The LCFW5 is designed for our 60 mm cage system and has five SM2-threaded filter holders for Ø2" optics. The spring-loaded wheel features indents that click into place, centering the filter in the cage. The stationary input and output ports of the main body are also SM2-threaded for compatibility with our Ø2" lens tubes. Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" (1.3 mm) hex key. For compatibility with standard optomechanics, the bottom contains a 1/4"-20 and an M6 tapped hole, as well as two 8-32 and two M4 tapped holes.

The filter wheel rotates around a 3/16" hex shoulder screw. The filter wheel can be removed by unscrewing the shoulder screw while gently holding the filter wheel. Lift out the filter wheel to easily add or remove filters, or to switch out for another 60 mm cage system filter wheel. To replace the filter wheel back into the main body, gently hold the wheel in place while reinserting and tightening the shoulder screw. To purchase additional filter wheels without the main body, please contact Tech Support.

Please note that while the two bottom cage rods may pass through the mount, the two top cage rods cannot, due to obstruction by the filter wheel.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LCFW5 Support Documentation
LCFW560 mm Cage Filter Wheel for Five Ø2" Filters
$192.00
Today
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