DIAMETER: 25.40mm + 0.00mm /- 0.13mm
THICKNESS: 3.15mm +/- 0.13mm
PARALLELISM: 2 ARC SECONDS MAXIMUM.
FLATNESS: 1/10 WAVE MAXIMUM WITHIN THE CENTRAL 80%
OF THE DIAMETER, 2 FACES.
SURFACE FINISH: 80-50 PER MIL-O-13830 WITHIN THE
CENTRAL 80% OF THE DIAMETER, 2 FACES.
EDGE BEVEL: 0.50mm +/- 0.25mm X 45deg, 2 PLACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, PREMIUM GRADE,
FREE OF TWINS, SMALL ANGLE GRAIN
BOUNDARIES, STRIAE, AND SCATTERING
CENTERS.
CRYSTALLOGRAPHIC ORIENTATION: C-AXIS PARALLEL AND
IN THE PLANE OF FACES, 90 DEG +/- 10deg.