The Muffler,exhaust, cataloged under National Stock Number 2990-00-781-0636, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Stemco Inc Sub of Coltec Industries Inc. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-781-0636 |
| Primary Part Number | 190-9146 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Stemco Inc Sub of Coltec Industries Inc |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| FSC Application Data | MISCELLANEOUS ENGINE ACCESSORIES NONAIRCRAFT |
| Outlet Thread Size | 3-1/2-8 FIRST OUTLET |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 7.000 INCHES NOMINAL IN |
| Outlet Thread Direction | RIGHT-HAND FIRST OUTLET |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 3.000 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 1 |
| Outlet Thread Series Designator | NPT FIRST OUTLET |
| Muffler Design | BAFFLE |
| Thread Location | EXTERNAL FIRST OUTLET |
| Tube Quantity | 2 |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 3-1/2-8 SINGLE INLET |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Surface Treatment | ALUMINUM |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | THREADED FIRST OUTLET |
| Outlet Location | CENTRALLY LOCATED 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 |
| Part Number | Manufacturer |
|---|---|
| 190-9146 PRIMARY | Stemco Inc Sub of Coltec Industries Inc (USA) |
| MFM08-5025 | Donaldson Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| MFM07-0050 | 5/9 Secondary reference Donaldson Company, Inc. |
NSN 2990-00-781-0636 is a Muffler,exhaust, manufactured by Stemco Inc Sub of Coltec Industries Inc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-781-0636 has 2 manufacturer part numbers on file: 190-9146 (Stemco Inc Sub of Coltec Industries Inc), MFM08-5025 (Donaldson Company, Inc.).
Key specifications for 190-9146: Operating Position: UNIVERSAL; FSC Application Data: MISCELLANEOUS ENGINE ACCESSORIES NONAIRCRAFT; Outlet Thread Size: 3-1/2-8 FIRST OUTLET; Inlet Location: CENTRALLY LOCATED IN END SECTION OF BODY. 25 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.