CONFIGURATION: SEGMENTED RING, PLANE-PARALLEL
OUTER RADIUS: 1.290″+/-.002″
INNER RADIUS: 0.710″+/-.002″
SEGMENT ANGLE: 76 +/-0.25 deg
THICKNESS: 0.040″+/-.002″
PARALLELISM: 1 ARC MINUTE MAXIMUM.
SURFACE ACCURACY: POWER: 1 FRINGE MAXIMUM
(2 FACES) IRREG: 1/2 FRINGE MAXIMUM
SURFACE QUALITY: 60-40 PER MIL-O-13830, 2 FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: (0001)
COATING: NONE, NOT REQUIRED.