78-122

View detailed technical data, stock status, and sourcing information for: 78-122
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-430-0151

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

4.062 inches nominal overall length, dry design type, right-hand single inlet inlet thread direction, threaded single inlet inlet connection type, 8.500 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: 4.062 inches nominal
Inlet Connection Type: threaded single inlet
Inlet Thread Direction: right-hand single inlet
Overall Diameter: 8.500 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: straight through
Tube Quantity: 1
Body Shape: round
Inlet Location: centrally located in end section of body single inlet
Inlet Projection Length: 2.125 inches nominal single inlet2.125 inches nominal
Inlet Thread Size: 2-11-1/2 single inlet
Inlet Thread Series Designator: npt single inlet
Inlet Thread Location: internal single inlet
Nonconnection Outlet Type And Quantity: 55 perforated
Nonconnection Outlet Location: in end section of body
Nonconnection Outlet Size: 0.125 in. dia
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Below is a list of NSNs that have been officially superseded by this NSN: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
2990-00-544-1124	No Name Available	12/01/1975

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
2757	Exhaust Muffler
2757-M	Exhaust Muffler
78-122	Exhaust Muffler
ABT2757	Exhaust Muffler
T-2757	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-430-0151?

The FSCG of the NSN 2990-00-430-0151 is 2990

Does the NSN 2990-00-430-0151 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-430-0151 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 2990-00-430-0151 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-430-0151 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 2990-00-430-0151 was assigned to the Federal Catalog?

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