T-SM12RR - M12.5 x 0.5 Retaining Ring for Ø12 mm Lens Mounts
T-SM12RR - M12.5 x 0.5 Retaining Ring for Ø12 mm Lens Mounts
Thread M12.5 x 0.5
Thickness 0.07" (1.7 mm)
Clear Aperture Ø0.40" (Ø10.2 mm)
| Internal Thread | External Thread | ||
| Min Major Diameter | 12.500 mm | Max Major Diameter | 12.480 mm |
| Min Pitch Diameter | 12.175 mm | Min Major Diameter | 12.374 mm |
| Max Pitch Diameter | 12.291 mm | Max Pitch Diameter | 12.155 mm |
| Min Minor Diameter (and 83.3% of Thread) |
11.959 mm | Min Pitch Diameter | 12.067 mm |
| Max Minor Diameter (and 64.9% of Thread) |
12.099 mm | Max Minor Diameter | 11.938 mm |
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.