4.438 in. Diameter hole in center of window
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 5945-00-529-0409
NSN 5910-01-281-3987
NSN 4140-00-277-6285
NSN 6220-01-027-1294
NSN 5965-01-341-4036
NSN 5990-01-529-7307
NSN 6110-01-453-7933
NSN 7035-01-451-6421
NSN 5925-00-918-5531
NSN 5920-01-251-4950
NSN 6110-01-373-0322
NSN 5910-01-191-1970