2990-00-203-4257

Find complete technical information, availability, and procurement data for: 2990-00-203-4257
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-203-4257

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

5.500 inches nominal overall diameter, unthreaded single inlet inlet connection type, dry design type, 5.000 inches nominal 1st outlet outlet inside diameter, 23.875 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: 23.875 inches nominal
Inlet Connection Type: unthreaded single inlet
Overall Diameter: 5.500 inches nominal
Outlet Inside Diameter: 5.000 inches nominal 1st outlet
Design Type: dry
Muffler Design: straight through
Body Shape: round
Operating Position: vertical
Inlet Location: centrally located in end section of body single inlet
Inlet Projection Length: 3.500 inches nominal single inlet
Inlet Outside Diameter: 3.000 inches nominal single inlet
Inlet Inside Diameter: 2.924 inches nominal single inlet
Outlet Connection Type: flange 2nd outlet
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: centrally located in end section of body 1st outlet
Outlet Flange Shape: round 1st outlet
Outlet Flange Mounting Provision And Quantity: 6 holes 1st outlet
Outlet Flange Mounting Hole Diameter: 0.200 inches nominal 1st outlet
Outlet Flange Mounting Provision Spacing: 6-3/4 in. dia bolt circle 1st outlet
Outlet Outside Diameter: 5.500 inches nominal 1st outlet
Material: glass fiber insulation
Material: steel comp 347 or steel comp 321 or steel comp 348 location not otherwise specified
Material Document And Classification: mil-s-6721 mil spec single material response

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
235-0076-16	Exhaust Muffler
64D24694	Exhaust Muffler
7545785-10	Exhaust Muffler
7839437-10	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-203-4257?

The FSCG of the NSN 2990-00-203-4257 is 2990

Does the NSN 2990-00-203-4257 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-203-4257 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 2990-00-203-4257 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-203-4257 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 2990-00-203-4257 was assigned to the Federal Catalog?

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