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 5915-01-251-4986
NSN 6150-00-763-7220
NSN 6645-01-546-3212
NSN 6220-01-328-7523
NSN 5855-00-995-2098
NSN 5945-01-607-9341
NSN 5985-01-152-6063
NSN 5996-01-213-3894
NSN 5925-00-156-4044
NSN 4140-01-268-2429
NSN 5990-00-963-1799
NSN 5960-01-089-7174