National Item Identification Number
00-273-1820
002731820
9340-00-273-1820
9340002731820
National Stock Number
Item Name
WINDOW,OBSERVATION
Federal Supply Class
9340
Description
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.
Commercial and Government Entity Code (Supplier Data)
Reference Numbers (Part Numbers)
1025469
18920PC3
345423PC25
Required Categories
STYLE DESIGNATOR
OVERALL DIAMETER
OVERALL THICKNESS
MATERIAL
MATERIAL DOCUME
Required Description
4 CIRCULAR
3.610 INCHES MINIMUM AND
3.640 INCHES MAXIMUM
0.360 INCHES MINIMUM