The Muffler,exhaust, cataloged under National Stock Number 2990-00-362-1865, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Hatch & Kirk, Inc.. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 2990-00-362-1865 |
| Primary Part Number | 3291123 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Inlet Flange Shape | SQUARE SINGLE INLET |
| Operating Position | HORIZONTAL |
| Inlet Location | CENTRALLY LOCATED ON SIDE OF MUFFLER |
| Coolant Type | AIR |
| Outlet Flange Mounting Provision and Quantity | 4 HOLES FIRST OUTLET |
| Inlet Flange Mounting Provision Thread Direction | RIGHT-HAND SINGLE INLET |
| Design Type | DRY |
| Overall Diameter | 12.125 INCHES NOMINAL IN |
| Baffle Quantity | 5 |
| Muffler Design | BAFFLE |
| Outlet Flange Shape | ROUND FIRST OUTLET |
| Tube Quantity | 2 |
| Inlet Connection Type | FLANGE SINGLE INLET |
| Body Shape | ROUND |
| Inlet Flange Mounting Provision and Quantity | 4 STUDS SINGLE INLET |
| Thread Size | 7/16-14 SINGLE INLET FLANGE MOUNTING PROVISION |
| Outlet Flange Mounting Hole Diameter | 0.750 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Flange Mounting Stud Length | 0.875 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Flange Mounting Provision Spacing | 6 IN. DIA BOLT CIRCLE IN |
| Outlet Connection Type | FLANGE 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 |
|---|---|
| 3291123 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3291123 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 2990-00-362-1865 is a Muffler,exhaust, manufactured by Hatch & Kirk, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-362-1865 has 1 manufacturer part number on file: 3291123 (Hatch & Kirk, Inc.).
Key specifications for 3291123: Inlet Flange Shape: SQUARE SINGLE INLET; Operating Position: HORIZONTAL; Inlet Location: CENTRALLY LOCATED ON SIDE OF MUFFLER; Coolant Type: AIR. 23 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.