DIAMETER: 1.220″+/-.0025″
THICKNESS: 0.250″+/-.002″
PARALLELISM: 10 ARC SECONDS MAXIMUM.
FLATNESS: 1/10 WAVE MAXIMUM, 1 FACE.
SURFACE QUALITY: 40-20 PER MIL-O-13830, 1 FACE.
OTHER FACE NON-CRITICAL POLISH.
CLEAR APERTURE: CENTRAL 1.120″ DIAMETER FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: (0001) NOMINAL.
MARKING: ARROW ON OD SURFACE POINTING TOWARDS
1/10 WAVE FLAT FACE.
COATING: NONE, NOT REQUIRED.