Features
type 517-645 grade b mil-g-174 optical glass iii material.
Includes quality control certificate of conformance.
Specifications
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Diameter:
Between 67.9 millimeters and 68.0 millimeters
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Thickness:
Between 8.3 millimeters and 8.7 millimeters
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Material:
Glass, optical, mil-g-174, grade b, type 517-645
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Federal Supply Class (fsc):
Optical instruments, test equipment, components and accessories
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National Stock Number (nsn):
6650-01-095-4987