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T-SM7RR - M7.5 x 0.5 Retaining Ring for Ø7 mm Lens Mounts

Fosco Connect Part No.: T-SM7RR

  • $ 18.00 or

T-SM7RR - M7.5 x 0.5 Retaining Ring for Ø7 mm Lens Mounts

Product Drawing

Thread M7.5 x 0.5

Thickness 0.07" (1.7 mm)

Clear Aperture Ø0.23" (Ø5.8 mm)

Internal Thread External Thread
Min Major Diameter 7.500 mm Max Major Diameter 7.480 mm
Min Pitch Diameter 7.175 mm Min Major Diameter 7.371 mm
Max Pitch Diameter 7.285 mm Max Pitch Diameter 7.155 mm
Min Minor Diameter
(and 83.3% of Thread)
6.959 mm Min Pitch Diameter 7.071 mm
Max Minor Diameter
(and 64.9% of Thread)
7.094 mm Max Minor Diameter 6.938 mm


  • Standard Retaining Rings for Optics Ranging
    from Ø5 mm to Ø1/2"

 Our Standard Retaining Rings are manufactured from anodized aluminum and are offered in sizes to match our optic mounts and lens tubes.

They maximize the clear aperture while providing sufficient holding force. Securing an optic using a retaining ring is a stable method for holding the optic since the optic is retained along its entire edge instead of just at a few points.

Each retaining ring is machined with two slots for compatibility with our selection of spanner wrenches.



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