Optical Instrument Window

Model / MPN: 8567556 | NSN: 1240-00-599-9218

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.

Product Details

NATO Stock Number

1240-00-599-9218

Sold in multiples of

DEMIL

Width

Between 24.9 millimeters and 25.4 millimeters

Thickness

Between 4.800 millimeters and 5.200 millimeters

Length

Between 62.740 millimeters and 63.240 millimeters

Surface Finish

Polished

Bevel Depth

0.510 millimeters

Refraction Index

Between 1.5160 and 1.5180

Polished Surface

Both

Dispersion

Between 64.000 angstroms and 65.000 angstroms

Reflection Reducing Surface

Both

Polished Periphery

Not provided

Bevel Angle In Deg

45.000

Material

Glass, optical, jan-g-174, type 517-645, grade c

Material

Glass, optical, jan-g-174, type 517-645, grade c

Fsc Application Data

Sight periscope t42

85675 Series Parts

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Optical Instrument Window

Pricing and Availability

Certified Quality Assurance

8567556 Cross Reference