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 4140-01-167-6571
NSN 5965-00-275-0491
NSN 5855-00-688-9954
NSN 6610-01-033-1748
NSN 5998-01-191-1589
NSN 5925-01-571-7346
NSN 6150-01-099-6168
NSN 5965-01-462-2291
NSN 5985-00-419-0342
NSN 5925-01-591-0307
NSN 6645-01-049-6116
NSN 6645-01-193-5214