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T-SM2LTRR - SM2 (2.035"-40) Stress-Free Retaining Ring

Fosco Connect Part No.: T-SM2LTRR

  • $ 45.00 or

T-SM2LTRR - SM2 (2.035"-40) Stress-Free Retaining Ring

Product Drawing

  • Design Provides Reduced Stress Clamping Action
  • Provides Light-Tight Seal Around an Optic
  • Our Stress-Free Retaining Rings are available with our standard SM05, SM1, or SM2 threadings.

  • This design uses an O-ring made of Buna-N nitrile rubber to reduce the stress on the optic surface and completely seal out sources of stray light.

  • Like our standard retaining rings, our stress-free retaining rings contain two slots for compatibility with our selection of spanner wrenches.

    Due to the rubber O-ring, the clear aperture is slightly reduced relative to our standard retaining rings.

  • Thread SM2 (2.035"-40)
  • Thickness 0.18" (4.6 mm)
  • Compatible Optic Mounts Any Internally SM2-Threaded Mount
  • Compatible Spanner Wrench
Internal Thread, UNS-2B External Thread, UNS-2A
Min Major Diameter 2.0350" Max Major Diameter 2.0338"
Min Pitch Diameter 2.0188" Min Major Diameter 2.0287"
Max Pitch Diameter 2.0239" Max Pitch Diameter 2.0176"
Min Minor Diameter
(and 83.3% of Thread)
2.008" Min Pitch Diameter 2.0137"
Max Minor Diameter
(and 64.9% of Thread)
2.014" Max Minor Diameter 2.0067"


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