The Muffler,exhaust, cataloged under National Stock Number 2990-00-105-1059, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 2990-00-105-1059 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| Outlet Thread Size | 1-11-1/2 FIRST OUTLET |
| Inlet Location | OFFSET IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 5.000 INCHES NOMINAL IN |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 1.125 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 2 |
| Outlet Thread Series Designator | NPT FIRST OUTLET |
| Muffler Design | BAFFLE |
| Thread Location | EXTERNAL FIRST OUTLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Inlet Thread Size | 1-11-1/2 SINGLE INLET |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Surface Treatment | PAINT |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 1.125 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Location | OFFSET 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 |
|---|---|
| D10769 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-00-105-1059 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-105-1059: Operating Position: UNIVERSAL; Outlet Thread Size: 1-11-1/2 FIRST OUTLET; Inlet Location: OFFSET IN END SECTION OF BODY; Coolant Type: AIR. 19 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.