91-1665995

View detailed technical data, stock status, and sourcing information for: 91-1665995
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-678-7461

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

2.000 inches nominal 1st outlet2.000 inches nominal outlet inside diameter, 28.000 inches nominal overall length, unthreaded single inlet inlet connection type, dry design type, 5.000 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: 28.000 inches nominal
Inlet Connection Type: unthreaded single inlet
Overall Diameter: 5.000 inches nominal
Outlet Inside Diameter: 2.000 inches nominal 1st outlet2.000 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: straight through w/baffle
Baffle Quantity: 3
Tube Quantity: 1
Body Shape: round
Inlet Location: centrally located in end section of body single inlet
Inlet Projection Length: 4.500 inches nominal single inlet4.500 inches nominal
Inlet Inside Diameter: 2.000 inches nominal single inlet2.000 inches nominal
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: centrally located in end section of body 1st outlet
Outlet Projection Length: 4.500 inches nominal 1st outlet4.500 inches nominal
Material: steel location not otherwise specified
Surface Treatment: aluminum alloy

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2990-00-489-6141	No Name Available	01/12/1973
2990-00-705-6228	No Name Available	09/01/1976
2990-00-864-1006	No Name Available	10/21/1972

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
1665995	Exhaust Muffler
3621	Exhaust Muffler
36T	Exhaust Muffler
757	Exhaust Muffler
91-1665995	Exhaust Muffler
HD200	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-678-7461?

The FSCG of the NSN 2990-00-678-7461 is 2990

Does the NSN 2990-00-678-7461 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-678-7461 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 2990-00-678-7461 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-678-7461 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 2990-00-678-7461 was assigned to the Federal Catalog?

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