Ring Windows Diameter Tolerance: +0.0, -0.1mm Thickness Tolerance: +/-0.05mm Parallelism: <10 arc se Ring Windows Ring windows is a special windows. It could be applied in special industry. Specifications:

Material:	BK7, B270, fused silia etc glass
Dimension Tolerance:	+0.0, -0.1mm
Thickness Tolerance:	± 0.1mm
Surface quality:	60/40(Standard), 10/5(High Precision)
Clear Aperture:	>85%
Flatness:	λ(Standard), λ/4(High Precision) per 25mm@633nm
Parallelism:	1' (Standard),  10" (High Precision)
Bevel:	<0.25mm X 45°
Coating:	Upon requirement

 

Glass Windows with aperture