Description:

1 ply quantity, 2.750 inches overall diameter, 0.110 inches overall thickness, polished surface finish, clear material transparency.

Special Features:

Diameter to be ground equidistance on each side of center line to width of 1.415 in. Min, 1.425 in. Max and beveled on all edges t 0.012 in. Min, 0.028 in. Max

Properties:

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.