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SM41RR - M41.5 x 0.5 Retaining Ring

Fosco Connect Part No.: T-SM41RR

  • $ 25.00 or



SM41RR - M41.5 x 0.5 Retaining Ring

Product Drawing

  • Standard Retaining Rings for Optics Ranging from Ø39 mm to Ø2"
  • Thread M41.5 x 0.5
  • Thickness 0.10" (2.5 mm)
  • Compatible Spanner Wrench T-SPW801
  • Clear Aperture Ø1.51" (Ø38.5 mm)
T-M41.5 x 0.5 Threading
Internal Thread External Thread
Min Major Diameter 41.500 mm Max Major Diameter 41.480 mm
Min Pitch Diameter 41.175 mm Min Major Diameter 41.371 mm
Max Pitch Diameter 41.306 mm Max Pitch Diameter 41.155 mm
Min Minor Diameter
(and 83.3% of Thread)
40.959 mm Min Pitch Diameter 41.056 mm
Max Minor Diameter
(and 64.9% of Thread)
41.094 mm Max Minor Diameter 40.938 mm
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