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 6645-01-648-4439
NSN 5999-00-973-9115
NSN 6645-01-502-3068
NSN 6650-01-293-7240
NSN 5935-01-315-4854
NSN 5905-00-330-2043
NSN 5960-01-391-1308
NSN 6320-01-330-4634
NSN 6130-00-335-6812
NSN 6240-01-022-3522
NSN 5998-00-772-6187
NSN 4140-00-715-0010