The Muffler,exhaust, cataloged under National Stock Number 2990-00-893-2523, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-893-2523 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| Inlet Outside Diameter | 4.000 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | OFFSET LOCATED ON END OF BODY |
| Design Type | WET |
| Overall Diameter | 7.125 INCHES NOMINAL IN |
| Inlet Projection Length | 3.000 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 1 |
| Muffler Design | STRAIGHT THROUGH W/BAFFLE |
| Outlet Outside Diameter | 4.000 INCHES NOMINAL FIRST OUTLET IN |
| Tube Quantity | 1 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Material | NICKEL ALLOY LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | OFFSET LOCATED ON END 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 |
|---|---|
| 724M04 | 5/9 Secondary reference U.S. Government activity |
| M08-4IN | 3/9 Design control — primary reference Beaird Industries Inc. |
| 4IN-MO-316L-SS | C/1 Advisory reference — outside the item-of-supply concept Beaird Industries Inc. |
NSN 2990-00-893-2523 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-893-2523: Operating Position: UNIVERSAL; Inlet Outside Diameter: 4.000 INCHES NOMINAL SINGLE INLET IN; Inlet Location: OFFSET LOCATED ON END OF BODY; Design Type: WET. 16 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.