DIAMETER: 3.200″+/-.005″
THICKNESS: 0.118″+/-.005″
PARALLELISM: 3 ARC MINUTES MAXIMUM
FLATNESS: NOT SPECIFIED
EDGE BEVEL: LIGHT PROTECTIVE BEVEL, 2 PLACES.
SURFACE FINISH: 60-40 PER MIL-PRF-13830, 2 FACES.
CLEAR APERTURE: CENTRAL 80% MINIMUM, 2 FACES.
MATERIAL TYPE/QUALITY: BK-7 GLASS, GRADE A, FINE
ANNEALED.
COATING: NONE, NOT REQUIRED.