DIAMETER: 20.50mm +/- 0.10mm
THICKNESS: 3.00mm +/- 0.04mm
PARALLELISM: 0.005mm MAXIMUM T.I.R.
EDGE BEVEL: 0.25mm MAXIMUM X 45 Deg, 2 PLACES.
SURFACE ACCURACY: POWER: 1.0 FRINGE MAXIMUM
(@ 633nm) IRREG: 0.5 FRINGE MAXIMUM
SURFACE QUALITY: 40-20 PER MIL-PRF-13830, 2 FACES.
CLEAR APERTURE: CENTRAL 18.00mm MINIMUM DIAMETER.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALOGRAPHIC ORIENTATION: (0001)
COATING: NONE, UNCOATED SUBSTRATE.