The Muffler,exhaust, cataloged under National Stock Number 2990-01-293-4462, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Donaldson Company, Inc.. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-293-4462 |
| Primary Part Number | WJM12-0422 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Donaldson Company, Inc. |
| Status | ACTIVE |
| Inlet Location | LOCATED IN END SECTION OF BODY |
| Design Type | JACKETED |
| Inlet Projection Length | 2.560 INCHES NOMINAL SINGLE INLET IN |
| Material Document and Classification | MIL-S-4174 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Outside Diameter | 6.0 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Nonconnection Outlet Location | LOCATED 6.250 IN. OFFSET FROM END OF BODY IN |
| Nonconnection Outlet Type and Quantity | 1 TUBE |
| Surface Treatment | ALUMINUM |
| Hand Hole Quantity | 4 |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Material | GLASS FIBER INSULATION |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | LOCATED 6.41 IN. C TO C OFFSET DISTANCE FROM INLET IN |
| 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 |
|---|---|
| 12358910 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| WJM12-0422 PRIMARY | Donaldson Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 18265-WJM12-0422 | 5/9 Secondary reference Donaldson Company, Inc. |
| 76700-22018-A | 5/9 Secondary reference Cummins Filtration Inc. |
| 22018-A | 5/9 Secondary reference Cummins Filtration Inc. |
NSN 2990-01-293-4462 is a Muffler,exhaust, manufactured by Donaldson Company, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-293-4462 has 2 manufacturer part numbers on file: 12358910 (U S Army Tank Automotive Command Amsta-Im-Mm), WJM12-0422 (Donaldson Company, Inc.).
Key specifications for WJM12-0422: Overall Height: 10.380 INCHES NOMINAL IN; Inlet Location: LOCATED IN END SECTION OF BODY; Design Type: JACKETED; Inlet Projection Length: 2.560 INCHES NOMINAL SINGLE INLET IN. 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.