403825R1

View detailed technical data, stock status, and sourcing information for: 403825R1
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-074-8873

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

27.380 inches nominal overall length, unthreaded single inlet inlet connection type, air coolant type, 5.500 inches nominal overall diameter, 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: 27.380 inches nominal
Inlet Connection Type: unthreaded single inlet
Overall Diameter: 5.500 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: baffle
Baffle Quantity: 1
Body Shape: round
Operating Position: universal
Inlet Location: centered on end of body single inlet
Inlet Projection Length: 2.690 inches nominal single inlet2.690 inches nominal
Inlet Inside Diameter: 1.930 inches nominal single inlet1.930 inches nominal
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: centered on end of body 1st outlet
Outlet Projection Length: 10.940 inches nominal 1st outlet10.940 inches nominal
Outlet Outside Diameter: 2.050 inches nominal 1st outlet2.050 inches nominal
Material: steel location not otherwise specified
Surface Treatment: aluminum

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2990-00-845-4032	No Name Available	01/01/1979

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
1305334H1	Exhaust Muffler
381665R92	Exhaust Muffler
403825R1	Exhaust Muffler
9166	Exhaust Muffler
9166-B	Exhaust Muffler
ABT9166	Exhaust Muffler
MFM05-008	Exhaust Muffler
MFM05-5008	Exhaust Muffler
MFM05-5019	Exhaust Muffler
T-9166	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-074-8873?

The FSCG of the NSN 2990-00-074-8873 is 2990

Does the NSN 2990-00-074-8873 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-074-8873 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 2990-00-074-8873 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-074-8873 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 2990-00-074-8873 was assigned to the Federal Catalog?

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