Diameter: 20.45mm + 0.00mm /- 0.10mm
Thickness: 1.040mm +/- 0.025mm
Edge bevels: 0.127mm +/- 0.075mm x 45 Degrees, Both Egdes
Parallelism: < 3.0 Arc Minutes
Flatness: 1.50 Waves Maximum @ 633nm, Both Faces
Surface Quality: 60-40 Per Mil-PRF-13830, Both Faces
Clear Aperture: Central 18.44mm Diameter, Both Faces
Material Type / Quality: Sapphire, Optical Grade 1
Growth Method: Kyropulos
75% Minimum Transmission @ 250nm
Crystallographic Orientation: c-Plane
Coating: None, Not Required