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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
30mm Diameter x 20mm Length, Cage Extension Tube



Stock #85-593
Qty 1
Volume Pricing
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Outer Diameter (mm):
Inner Diameter (mm):
Length (mm):
Mounting Threads:
M27.5 x 0.75 (Female Through)

Regulatory Compliance

Not Compliant

Product Family Description

  • Fit within Inner Diameter of Cage System Plates
  • Use with Retaining Ring Pairs to Secure Optics
  • Join Multiple with Adjustable Length Tubes and Thread Adapters

M23.2 and M27.5 Fixed Extension Tubes are ideal for covering portions of the cage system. Each fixed extension tube is designed to fit within the inner diameter of a cage system plate, and feature either M23.2 x 0.75 or M27.5 x 0.75 female threading throughout the entire length of the tube. Retaining ring pairs can be used to secure optics within the extension tube, while adjustable length tubes and thread adapters can be used to connect fixed extension tubes for building customized optical assemblies.


#85-582 threads into a M23.2 x 0.75 standard tube to easily mount a plate beamsplitter. #85-539 fits within the inner diameter of cage system plates; it also threads into a M23.2 x 0.75 standard tube.

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