Material

Borosilicate Crown Optical Glass (BK-7)

Diameter Tolerance

+/- 0.1 mm

Thickness Tolerance

+/- 0.1 mm

Parallelism

≤ 5 arc. min.

Perpendicularity

90 degree +/- 30 arc min or upon customer's request

Chamfer

min. protective chamfer or upon customer's request