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 2925-01-062-2660
NSN 7035-00-495-2137
NSN 5925-00-262-5651
NSN 5915-01-205-2933
NSN 5996-01-212-9866
NSN 6240-00-249-6259
NSN 5855-01-512-1926
NSN 7035-01-426-4133
NSN 6320-01-495-1244
NSN 5990-00-159-1774
NSN 6130-01-607-0490
NSN 5950-01-169-2143