Cage Plate Adapter for FiberPorts

  • Centers Any FiberPort Inside 30 mm Cage System
  • SM1 Lens Tube Compatible



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  • Integrates FiberPort Products into 30 mm Cage Systems
  • Allows Stable Fiber Launch Solutions for Cage System Applications
  • Directly Compatible with Our Ø1" Lens Tubes
  • Mounting Screws for FiberPort are Included
  • 8-32 (M4) Tapped Hole for Post Mounting

The CP08FP(/M) is designed to center a FiberPort inside a 30 mm cage system. It features enhanced cage-rod flexure clamps that are designed to securely hold the cage plate in position for greater stability of the FiberPort system. ER rods can be inserted into the four holes, and secured using the 4-40 cap screws, provided in the adapter as shown in the family image above. In addition, the four 2-56-threaded, 1/4"-long stainless steel socket head screws necessary to secure a FiberPort to the adapter are included. The cage plate contains an internal SM1 (1.035"-40) threading, enabling it to be used with our extensive line of Ø1" lens tubes. A bottom-located 8-32 (M4) tap is provided for post mounting.

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.

Posted Comments:
bdada  (posted 2011-07-19 09:35:00.0)
Response from Buki at Thorlabs: The CP02FP/M (metric version) is similar to the CP02FP (imperial version) except that the metric version has an M4 mounting hole at the bottom while the imperial version has an 8-32 mounting hole. If you don’t need to mount the cage plate to a post, the metric version will work well as a substitute.
theo.rickert  (posted 2011-07-18 17:01:30.0)
I was trying to order a PAF-X-2-A with a CP02FP. Since this plate adapter isnt available and would be shipped separately, I checked CP02FP/M, which is available. According to the drawings its identical but for a "metric" mark. I dont dare order it because I dont want to end up with an adapter I cant use and still having to order the other type separately. Are these two really the same (but for the mark)?
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+1 Qty Docs Part Number - Imperial Price Available
CP08FP Support Documentation
CP08FPFiberPort Adapter for 30 mm Cage System, Enhanced Clamping
+1 Qty Docs Part Number - Metric Price Available
CP08FP/M Support Documentation
CP08FP/MFiberPort Adapter for 30 mm Cage System, Enhanced Clamping, Metric