DIAMETER: 1.500″+.000″/-.005″
THICKNESS: 0.250″+/-.005″
PARALLELISM: 3 ARC MINUTES MAXIMUM
EDGE BEVEL: 0.010″ NOMINAL X 45deg, 2 PLACES.
FLATNESS: 2 WAVES MAXIMUM AT 0.633um, 2 FACES.
SURFACE QUALITY: 60-40 PER MIL-O-13830, 2 FACES.
CLEAR APERTURE: CENTRAL 90% OF DIAMETER, 2 FACES.
MATERIAL TYPE/QUALITY: FUSED SILICA, INFRASIL 2,
WATER-FREE, OPTICAL GRADE.
COATING: NONE, NOT REQUIRED.