DIAMETER: 25.40mm + 0.000mm /- 0.127mm
THICKNESS: 0.61mm +/- 0.05mm
PARALLELISM: 1 ARC MINUTE MAXIMUM
FLATNESS: POWER: 2 FRINGES MAXIMUM WITHIN CLEAR
APERTURE, 2 FACES.
IRREG: 2 FRINGES MAXIMUM WITHIN CLEAR
APERTURE, 2 FACES.
CLEAR APERTURE: CENTRAL 21.5mm MINIMUM DIAMETER,
2 FACES.
SURFACE FINISH: E-E PER MIL-F-68497, WITHIN
CLEAR APERTURE, 2 FACES.
EDGE BEVEL: LIGHT PROTECTIVE BEVEL, 2 PLACES.
EDGE CHIPS: PER MIL-O-13830.
MATERIAL TYPE/QUALITY: SAPPHIRE, PREMIUM GRADE.
CRYSTALLOGRAPHIC ORIENTATION: C-AXIS PERPENDICULAR
TO FACES WITHIN 2 DEGREES.