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 5950-01-426-1168
NSN 6610-01-141-7014
NSN 5999-00-021-2327
NSN 6650-00-316-4889
NSN 6105-01-327-4124
NSN 5935-01-102-1720
NSN 5910-00-822-4407
NSN 6610-00-390-8471
NSN 5915-01-462-0432
NSN 6150-00-415-9974
NSN 5920-00-959-5664
NSN 5965-01-271-0808