Optical Instrument Window

Model / MPN: 278703PC12 | NSN: 1240-00-171-4160

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

1240-00-171-4160

Sold in multiples of

1 EA

DEMIL

DEMIL/MLI

Diameter

Between 39.800 millimeters and 40.000 millimeters

Thickness

Between 3.300 millimeters and 3.700 millimeters

Surface Finish

Polished

Bevel Depth

1.400 millimeters

Refraction Index

1.5170

Polished Surface

Both

Dispersion

64.5 angstroms

Reflection Reducing Surface

Both

Polished Periphery

Not provided

Bevel Angle In Deg

Between 44.8333 and 45.1667

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

Rangefinder mk 37 mods 5 and 6

278703PC Series Parts

Pricing and Availability

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Optical Instrument Window

Pricing and Availability

Certified Quality Assurance

278703PC12 Cross Reference