278694PC6

View detailed technical data, stock status, and sourcing information for: 278694PC6
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Federal Supply Group

Fire Control Equipment

Federal Supply Classification

1240 Optical Sighting and Ranging Equipment

National Stock Number

1240-00-171-7900

Item Name Code

10908

Assigment Date

01/01/1963 (63 years ago)

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.

4.800 millimeters nominal thickness, 1.5170 nominal refraction index, 1.100 millimeters nominal bevel depth, both polished surface, 46.000 millimeters nominal diameter

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Diameter: 46.000 millimeters nominal
Thickness: 4.800 millimeters nominal
Bevel Depth: 1.100 millimeters nominal
Refraction Index: 1.5170 nominal
Polished Surface: both
Reflection Reducing Surface: both
Polished Periphery: not provided
Bevel Angle In Deg: 45.000 nominal
Material: glass optical location not otherwise specified
Material Document And Classification: jan-g-174, type 517-645, grade c mil spec single material response location not otherwise specified
Fsc Application Data: telescope mk 61 mods 0-5

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
278694PC6	Optical Instrument Window

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 1240-00-171-7900?

The FSCG of the NSN 1240-00-171-7900 is 1240

Does the NSN 1240-00-171-7900 have a Schedule B code assigned?

Yes, the Schedule B code is 9803200000

Does NSN 1240-00-171-7900 require demilitarization?

Usml or ccl military items - demil required. Destroy item and components to prevent restoration or repair to a usable condition. (note 5).

Does NSN 1240-00-171-7900 contain precious materials?

Item does not contain precious metal.

Does NSN 1240-00-171-7900 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 1240-00-171-7900 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963

Professional Distribution

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