2990-00-729-6721

Find complete technical information, availability, and procurement data for: 2990-00-729-6721
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-729-6721

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

2.469 inches nominal overall width, 3.125 inches nominal overall height, right-hand single inlet inlet thread direction, 4.891 inches nominal overall length, threaded single inlet inlet connection type

Product Characteristics

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

Overall Length: 4.891 inches nominal
Overall Height: 3.125 inches nominal
Overall Width: 2.469 inches nominal
Inlet Connection Type: threaded single inlet
Inlet Thread Direction: right-hand single inlet
Outlet Inside Diameter: 0.750 inches nominal 1st outlet0.750 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: straight through
Body Shape: oval
Operating Position: horizontal
Inlet Location: centrally located in end section of body single inlet
Inlet Projection Length: 1.250 inches nominal single inlet1.250 inches nominal
Inlet Thread Size: 1/2-14 single inlet
Inlet Thread Location: external single inlet
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: centrally located in end section of body 1st outlet
Outlet Projection Length: 1.125 inches nominal 1st outlet1.125 inches nominal
Outlet Outside Diameter: 1.000 inches nominal 1st outlet1.000 inches nominal
Material: steel location not otherwise specified
Surface Treatment: aluminum
Fsc Application Data: muffler,exhaust-intake,except aircraft

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2990-00-898-4735	No Name Available	09/01/1978

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
294441	Exhaust Muffler
555C128	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-729-6721?

The FSCG of the NSN 2990-00-729-6721 is 2990

Does the NSN 2990-00-729-6721 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-729-6721 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 2990-00-729-6721 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-729-6721 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 2990-00-729-6721 was assigned to the Federal Catalog?

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