The Muffler,exhaust, cataloged under National Stock Number 2990-00-483-1010, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-483-1010 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 1.750 INCHES NOMINAL IN |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 1.250 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | BAFFLE |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | ROUND |
| Nonconnection Outlet Location | IN END SECTION OF BODY |
| Nonconnection Outlet Type and Quantity | 8 PERFORATED |
| Inlet Thread Size | 1/2-14 SINGLE INLET |
| Nonconnection Outlet Size | DIA OF HOLES ANY ACCEPTABLE |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 30911 | 3/9 Design control — primary reference Lauson Division of Tecumseh Products Co |
NSN 2990-00-483-1010 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 9340-01-174-5841. Verify interchangeability with system specifications before substitution.
Key specifications for 2990-00-483-1010: Coolant Type: AIR; Design Type: DRY; Overall Diameter: 1.750 INCHES NOMINAL IN; Inlet Thread Location: EXTERNAL SINGLE INLET. 15 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.