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T-SM1RRV - Unanodized Aluminum SM1 Retaining Ring for Ø1" Lens Tubes and Mounts

Fosco Connect Part No.: T-SM1RRV

  • $ 20.00 or

T-SM1RRV - Unanodized Aluminum SM1 Retaining Ring for Ø1" Lens Tubes and Mounts

Product Drawing

  • SM05-, SM1-, or SM2-Threaded Unanodized Retaining Rings
  • Ideal for Use With Our Aluminum Vacuum-Compatible SM-Threaded Components
  • Vacuum Compatibility: >10-6 Torr
  • Thread SM1 (1.035"-40)
  • Thickness 0.08" (2.0 mm)
  • Compatible Spanner Wrench T-SPW606, T-SPW602 or T-SPW801
  • Compatible Optic Mounts Any Internally SM1-Threaded Mount
  • Clear Aperture Ø0.90" (Ø22.9 mm)

These aluminum SM05-, SM1-, or SM2-threaded retaining rings have identical thread specifications, thickness, and clear aperture when compared to our standard retaining rings of the same size. Their lack of anodization and 6061-T6 alumimun construction allows them to be used at vacuum levels down to 10-6 Torr. They are designed for use with our SM-threaded vacuum-compatible components. Each ring is double vacuum-bagged for clean room use.


Vacuum Specifications
Vacuum Compatibility as Packageda >10-6 Torr
Material 6061-T6 Aluminum
Preparation and Packaging Chemically Cleaned and
Double Vacuum-Bagged
Aluminum Outgassing Rate at 20 °C 7.6 x 10-9 Torr-Liters/s/cm2
SM1 (1.035"-40.0) Threading
Internal Thread, UNS-2B External Thread, UNS-2A
Min Major Diameter 1.0350" Max Major Diameter 1.0339"
Min Pitch Diameter 1.0188" Min Major Diameter 1.0288"
Max Pitch Diameter 1.0234" Max Pitch Diameter 1.0177"
Min Minor Diameter
(and 83.3% of Thread)
1.008" Min Pitch Diameter 1.0142"
Max Minor Diameter
(and 64.9% of Thread)
1.014" Max Minor Diameter 1.0068"


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