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 5835-00-196-9771
NSN 6110-01-196-3560
NSN 5930-00-071-0924
NSN 6685-01-613-6046
NSN 5920-01-441-2427
NSN 6610-01-412-0058
NSN 6645-01-516-7978
NSN 5965-01-464-9885
NSN 5915-00-558-4413
NSN 5996-00-079-0384
NSN 5999-00-939-7014
NSN 6145-01-334-0646