The Muffler,exhaust, cataloged under National Stock Number 2990-00-103-0100, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-103-0100 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Outside Diameter | 4.000 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | LOCATED IN END SECTION OF BODY ON TOP EDGE |
| Coolant Type | WATER |
| Design Type | WET |
| Overall Diameter | 10.250 INCHES NOMINAL IN |
| Inlet Projection Length | 3.000 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | STRAIGHT THROUGH |
| Outlet Outside Diameter | 4.000 INCHES NOMINAL FIRST OUTLET IN |
| Material | COPPER ALLOY 706 LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Location | LOCATED IN END SECTION OF BODY ON TOP EDGE |
| 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 |
|---|---|
| MOSIZE 6IN/W 51N INLET | 3/9 Design control — primary reference Beaird Industries Inc. |
| 3160M245-2PC5 | 5/9 Secondary reference U.S. Government activity |
NSN 2990-00-103-0100 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-103-0100: Operating Position: HORIZONTAL; Inlet Outside Diameter: 4.000 INCHES NOMINAL SINGLE INLET IN; Inlet Location: LOCATED IN END SECTION OF BODY ON TOP EDGE; Coolant Type: WATER. 12 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.