DIAMETER: 3.500″+.000″/-.005″
THICKNESS: 0.200″+/-.005″
PARALLELISM: 3 ARC MINUTES MAXIMUM.
EDGE BEVEL: 0.020″NOMINAL X 45deg, 2 PLACES.
SURFACE ACCURACY: 2 WAVES MAXIMUM WITHIN CLEAR
APERTURE, 2 FACES.
SURFACE QUALTIY: 60-40 PER MIL-PRF-13830, 2 FACES.
CLEAR APERTURE: CENTRAL 2.800″ MINIMUM DIAMETER,
2 FACES.
MATERIAL TYPE/QUALITY: CALCIUM FLUORIDE, OPTICAL
GRADE.
COATING: NONE, NOT REQUIRED.