3981942

View detailed technical data, stock status, and sourcing information for: 3981942
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-778-0031

Item Name Code

10849

Assigment Date

03/15/1968 (58 years ago)

9.500 inches nominal overall width, 1.688 inches nominal 1st outlet1.688 inches nominal outlet inside diameter, unthreaded single inlet inlet connection type, 21.000 inches nominal overall length, 5.000 inches nominal overall height

Product Characteristics

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

Overall Length: 21.000 inches nominal
Overall Height: 5.000 inches nominal
Overall Width: 9.500 inches nominal
Inlet Connection Type: unthreaded single inlet
Outlet Inside Diameter: 1.688 inches nominal 1st outlet1.688 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: multipass
Tube Quantity: 3
Body Shape: oval
Operating Position: horizontal
Inlet Location: located on center of end section single inlet
Inlet Projection Length: 2.000 inches nominal single inlet2.000 inches nominal
Inlet Outside Diameter: 2.125 inches nominal single inlet2.125 inches nominal
Inlet Inside Diameter: 2.000 inches nominal single inlet2.000 inches nominal
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: offset on end section opposite inlet 1st outlet
Outlet Projection Length: 2.000 inches nominal 1st outlet2.000 inches nominal
Outlet Outside Diameter: 1.812 inches nominal 1st outlet1.812 inches nominal
Material: steel location not otherwise specified
Surface Treatment: zinc

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2990-00-229-2818	No Name Available	07/01/1979

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
21293	Exhaust Muffler
3792269	Exhaust Muffler
3831583	Exhaust Muffler
3866266	Exhaust Muffler
3874660	Exhaust Muffler
3884816	Exhaust Muffler
3908390	Exhaust Muffler
3908396	Exhaust Muffler
3923366	Exhaust Muffler
3981942	Exhaust Muffler
749	Exhaust Muffler
8876M	Exhaust Muffler
CH53	Exhaust Muffler
MUB19	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-778-0031?

The FSCG of the NSN 2990-00-778-0031 is 2990

Does the NSN 2990-00-778-0031 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-778-0031 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 2990-00-778-0031 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-778-0031 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 2990-00-778-0031 was assigned to the Federal Catalog?

It was assigned 58 years ago, on Fri, Mar 15, 1968