891638

View detailed technical data, stock status, and sourcing information for: 891638
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Federal Supply Group

Fire Control Equipment

Federal Supply Classification

1240 Optical Sighting and Ranging Equipment

National Stock Number

1240-01-258-2395

Item Name Code

22585

Assigment Date

07/01/1987 (39 years ago)

An item consisting of a pair of electrical conductors imbedded in a semiconductor material, having a negative temperature coefficient of resistance which is tightly encased in a suitable metallic tube. The ends of the assembly are terminated for adaption in a fire detector system.

aluminum alloy material, 6.970 inches nominal outside diameter, 5.570 inches nominal aperture diameter, 0.060 inches nominal internal flange thickness, 1.540 inches nominal overall length

Product Characteristics

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

Overall Length: 1.540 inches nominal
Outside Diameter: 6.970 inches nominal
Aperture Diameter: 5.570 inches nominal
Internal Flange Thickness: 0.060 inches nominal
Material: aluminum alloy

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
704AS1033-1 AND 704AS1638-2	Optical Element Retaining Ring
704AS1638-2	Optical Element Retaining Ring
891638	Optical Element Retaining Ring

FAQs

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

What is the FSCG of the NSN 1240-01-258-2395?

The FSCG of the NSN 1240-01-258-2395 is 1240

Does the NSN 1240-01-258-2395 have a Schedule B code assigned?

Yes, the Schedule B code is 9803200000

Does NSN 1240-01-258-2395 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 1240-01-258-2395 contain precious materials?

Item does not contain precious metal.

Does NSN 1240-01-258-2395 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 1240-01-258-2395 was assigned to the Federal Catalog?

It was assigned 39 years ago, on Wed, Jul 1, 1987