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 5985-00-949-5727
NSN 6150-01-435-5026
NSN 5855-01-077-6264
NSN 5895-00-813-9883
NSN 6105-00-501-7681
NSN 5855-00-285-8172
NSN 5935-00-013-1080
NSN 6620-01-542-5569
NSN 5975-01-360-0688
NSN 5925-01-516-2823
NSN 5920-01-618-8405
NSN 5895-01-417-3218