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 6220-01-483-2098
NSN 5990-00-424-8872
NSN 5985-00-468-1360
NSN 6135-01-068-0119
NSN 6320-00-937-5625
NSN 6145-01-151-6133
NSN 5975-00-527-9656
NSN 5960-01-459-6665
NSN 6610-01-551-9122
NSN 6135-01-482-1290
NSN 6620-00-516-3204
NSN 5999-01-534-1899