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 6105-01-654-1899
NSN 5960-01-021-7207
NSN 5990-01-612-5323
NSN 5965-01-113-9061
NSN 5975-00-318-4623
NSN 6105-01-534-5360
NSN 5990-00-734-7285
NSN 6135-01-142-6456
NSN 5925-01-047-2281
NSN 5835-01-241-1090
NSN 6685-01-106-7672
NSN 5930-01-214-4188