7645552

Optical instrument window

7645552 Description

1.740 inches diameter, 0.240 inches thickness, ground surface finish, element in accord with spec mil-o-13830; spherical power not to exceed 3 fringes, astigmatism 2 fringes; light deviation not to exceed 2 minutes (0.033 deg) of arc; surfaces quality 80-50; used on periscope .

Features

Element in accord with specification mil-o-13830; spherical power not to exceed 3 fringes, astigmatism 2 fringes; light deviation not to exceed 2 minutes (0.033 deg) of arc; surfaces quali type 80-50; used on periscope and howitzers m109a2 and m109a3

Properties of 7645552

Diameter:
Between 1.740 inches and 1.745 inches
Thickness:
Between 0.240 inches and 0.250 inches
Surface Finish:
Ground and polished
Bevel Depth:
Between 0.020 inches and 0.030 inches
Polished Surface:
Both
Polished Periphery:
Provided
Bevel Angle In Deg:
Between 42.000 and 48.000
Material:
Glass, optical, mil-g-174, grade d, type 523-586
Material:
Glass, optical, mil-g-174, grade d, type 523-586
NSN:
1240-00-864-2936
Description:
Window,optical Instrument
Cage Code:

Definition Optical Instrument Window

A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. This item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.

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Last modified 11/17/2024