DIAMETER: 17.63mm +/- 0.05mm
THICKNESS: 10.00mm +/- 0.05mm
PARALLELISM: 3 ARC MINUTES MAXIMUM.
EDGE BEVEL: 0.80mm +/- 0.05mm X 20deg, 2 PLACES
SURFACE FLATNESS: 0.010mm MAXIMUM BOTH FACES.
SURFACE QUALITY: 40-20 PER MIL-PRF-13830, 2 FACES.
CLEAR APERTURE: CENTRAL 15.00mm MINIMUM DIAMETER.
MATERIAL TYPE/QUALITY: SAPPHIRE, HEM GROWN, LOW
ABSORPTION, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: c-PLANE
COATING: NONE, NOT REQUIRED.