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 5950-01-448-2088
NSN 5935-00-287-5069
NSN 6620-01-394-7526
NSN 6220-01-487-2229
NSN 6650-01-368-3286
NSN 5965-01-523-4572
NSN 5985-01-366-5129
NSN 5905-00-938-5479
NSN 5920-01-565-2332
NSN 5960-00-935-6484
NSN 5999-00-246-7084
NSN 6240-01-342-1588