65A81C57

View detailed technical data, stock status, and sourcing information for: 65A81C57
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-407-9419

Item Name Code

10849

Assigment Date

01/18/1972 (54 years ago)

3.499 inches nominal 1st outlet3.499 inches nominal outlet inside diameter, 7.620 inches nominal overall diameter, 22.000 inches nominal overall length, unthreaded single inlet inlet connection type, dry design 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: 22.000 inches nominal
Inlet Connection Type: unthreaded single inlet
Overall Diameter: 7.620 inches nominal
Outlet Inside Diameter: 3.499 inches nominal 1st outlet3.499 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: baffle
Baffle Quantity: 5
Tube Quantity: 3
Body Shape: round
Operating Position: horizontal
Inlet Location: located in end section of body 1.500 in. from horizontal center line to center of inlet and 0.880 in. from vertical center line to center of inlet single inlet
Inlet Projection Length: 2.500 inches nominal single inlet2.500 inches nominal
Inlet Outside Diameter: 3.506 inches minimum and 3.526 inches maximum single inlet
Inlet Inside Diameter: 3.380 inches minimum and 3.400 inches maximum single inlet
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: located on bottom side of body 3.000 in. from center of outlet to body end 1st outlet
Outlet Projection Length: 8.000 inches nominal 1st outlet8.000 inches nominal
Outlet Outside Diameter: 3.625 inches nominal 1st outlet3.625 inches nominal
Special Features: cleanout plug located on bottom side of body 7.000 in. from outlet end
Material: steel corrosion resisting location not otherwise specified

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2990-00-481-9475	No Name Available	02/01/1979

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
11350	Exhaust Muffler
11350-N	Exhaust Muffler
65A81C57	Exhaust Muffler
ABT11350	Exhaust Muffler
T-1135	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-407-9419?

The FSCG of the NSN 2990-00-407-9419 is 2990

Does the NSN 2990-00-407-9419 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-407-9419 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 2990-00-407-9419 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-407-9419 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 2990-00-407-9419 was assigned to the Federal Catalog?

It was assigned 54 years ago, on Tue, Jan 18, 1972