The Muffler,exhaust, cataloged under National Stock Number 2990-01-028-0505, 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15 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-028-0505 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Location | LOCATED OFF CENTER IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Outlet Inside Diameter | 3.018 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 3.880 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | BAFFLE |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Surface Treatment | ZINC |
| Inlet Inside Diameter | 3.018 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.880 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | LOCATED OFF CENTER IN END SECTION OF BODY |
| 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 |
|---|---|
| ZF5861M | 5/2 Secondary reference U.S. Government activity |
| 440737C1 | 5/9 Secondary reference U.S. Government activity |
| MOM09-0159 | 5/9 Secondary reference Donaldson Company, Inc. |
| WOM09-0159 | 3/9 Design control — primary reference Donaldson Company, Inc. |
NSN 2990-01-028-0505 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-01-028-0505: Operating Position: HORIZONTAL; Overall Height: 12.120 INCHES NOMINAL IN; Inlet Location: LOCATED OFF CENTER IN END SECTION OF BODY; Coolant Type: AIR. 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.