DIAMETER: 1.250″+.000″/-.005″
THICKNESS: 2.50mm +/- 0.10mm
PARALLELISM: 1 ARC MINUTE MAXIMUM.
FLATNESS: 1/4 WAVE/INCH MAXIMUM, 2 FACES.
EDGE BEVEL: 0.010″/0.015″ X 45deg, 2 PLACES.
SURFACE FINISH: 60-40 PER MIL-PRF-13830, 2 FACES.
CLEAR APERTURE: CENTRAL 90% OF DIAMETER FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: C-AXIS PERPENDICULAR
TO FACES, (0001) +/- 2 DEGREES.