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 5895-01-109-6853
NSN 5930-01-483-4268
NSN 6620-00-635-7347
NSN 6130-00-079-3581
NSN 5925-01-266-7813
NSN 6135-01-163-0332
NSN 5950-01-409-2785
NSN 5960-01-395-9834
NSN 6220-00-173-7200
NSN 5999-00-079-0368
NSN 6135-01-487-6275
NSN 5895-01-215-2791