M490C

View detailed technical data, stock status, and sourcing information for: M490C
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Federal Supply Group

Nonmetallic Fabricated Materials

Federal Supply Classification

9340 Glass Fabricated Materials

National Stock Number

9340-01-030-8540

Item Name Code

16880

Assigment Date

11/12/1976 (49 years ago)

A replaceable item designed to provide a stationary seating surface for a mating, moveable item such as a valve disk or the like. The body may have a flange of various shapes. For diesel and gasoline reciprocating engines, see insert, engine valve seat.

glass material, 0.688 inches nominal overall length, 1.437 inches nominal overall diameter

Product Characteristics

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

Overall Length: 0.688 inches nominal
Overall Diameter: 1.437 inches nominal
Material: glass

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
M490C	Observation Window

FAQs

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

What is the FSCG of the NSN 9340-01-030-8540?

The FSCG of the NSN 9340-01-030-8540 is 9340

Does the NSN 9340-01-030-8540 have a Schedule B code assigned?

Yes, the Schedule B code is 7016900000

Does NSN 9340-01-030-8540 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 9340-01-030-8540 contain precious materials?

Item does not contain precious metal.

Does NSN 9340-01-030-8540 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 9340-01-030-8540 was assigned to the Federal Catalog?

It was assigned 49 years ago, on Fri, Nov 12, 1976