Faces must be parallel to within 0.010 in
A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5950-00-263-3671
NSN 5945-00-935-6922
NSN 5965-01-533-3989
NSN 6105-00-452-3855
NSN 5935-01-445-3397
NSN 5855-01-562-9999
NSN 5935-01-585-7018
NSN 5935-01-336-0192
NSN 6110-01-269-9910
NSN 5925-01-462-5251
NSN 5930-01-608-8725
NSN 6110-00-878-9118