Muffler, Exhaust2990-01-657-4804

NSN 2990-01-657-4804 · NIIN 016574804

FSC 2990 — Miscellaneous Engine Accessories, Nonaircraft · FSG 29 — Engine Accessories

Government record, cited

Also searched as 2990-01-657-4804 · 2990016574804 · NIIN 016574804 · 01-657-4804 · FSC 2990 Miscellaneous Engine Accessories, Nonaircraft

Nearby stock numbers ← 2990-01-657-4643 Guard, Muffler-Exhaust Pipe, Nonai · 2990-01-657-5480 Cap Assembly, Protective, Muffler- →

Features

Muffler,exhaust — FSC 2990
Inlet Flange Shape: ROUND SINGLE INLET
Inlet Outside Diameter: 0.500 INCHES NOMINAL SINGLE INLET IN
Inlet Connection Type: THREADED SINGLE INLET
Body Shape: ROUND
Nondefinitive Spec/std Data: X05 MODEL
Inlet Thread Series Designator: NPT SINGLE INLET

Identification

NSN: 2990-01-657-4804
NIIN: 016574804
FSC: 2990 — Miscellaneous Engine Accessories, Nonaircraft
FSG: 29 — Engine Accessories

General Description

The Muffler,exhaust, cataloged under National Stock Number 2990-01-657-4804, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	2990-01-657-4804
Item Name	Muffler,exhaust
FSC / FSG	2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft
Status	ACTIVE
Inlet Flange Shape	ROUND SINGLE INLET
Inlet Outside Diameter	0.500 INCHES NOMINAL SINGLE INLET IN
Inlet Connection Type	THREADED SINGLE INLET
Body Shape	ROUND
Nondefinitive Spec/std Data	X05 MODEL
Inlet Thread Series Designator	NPT SINGLE INLET

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
0312005	3/2 Design control — primary reference U.S. Government activity

No interchangeability data on file.

Other items in FSC 2990 — Miscellaneous Engine Accessories, Nonaircraft

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

2990-00-001-0001

BLOWER ASSEMBLY

2990-00-001-1248

2990-00-001-1248 · Item name not on file

2990-00-001-1250

2990-00-001-1250 · Item name not on file

2990-00-001-2055

2990-00-001-2055 · Item name not on file

2990-00-001-3498

2990-00-001-3498 · Item name not on file

2990-00-001-3520

2990-00-001-3520 · Item name not on file

2990-00-001-3521

2990-00-001-3521 · Item name not on file

2990-00-001-3522

CAP ASSEMBLY,MUFFLE

Frequently Asked Questions

What is NSN 2990-01-657-4804?

NSN 2990-01-657-4804 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.

What are the specifications of 2990-01-657-4804?

Key specifications for 2990-01-657-4804: Inlet Flange Shape: ROUND SINGLE INLET; Inlet Outside Diameter: 0.500 INCHES NOMINAL SINGLE INLET IN; Inlet Connection Type: THREADED SINGLE INLET; Body Shape: ROUND. 6 specifications are documented in the U.S. Government catalog.

Is NSN 2990-01-657-4804 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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