The Muffler,exhaust, cataloged under National Stock Number 2990-00-336-9933, 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 19 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-336-9933 |
| Primary Part Number | 330T648 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Inlet Flange Shape | ROUND SINGLE INLET |
| Operating Position | VERTICAL |
| Inlet Location | LOCATED ON SIDE OF BODY |
| Coolant Type | AIR |
| Outlet Flange Mounting Provision and Quantity | 10 HOLES FIRST OUTLET |
| Design Type | DRY |
| Overall Diameter | 13.769 INCHES NOMINAL IN |
| Inlet Flange Mounting Hole Diameter | 0.688 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | BAFFLE AND DIRECTIONAL VANE |
| Outlet Flange Shape | ROUND FIRST OUTLET |
| Inlet Connection Type | FLANGE SINGLE INLET |
| Body Shape | ROUND |
| Inlet Flange Mounting Provision and Quantity | 10 HOLES SINGLE INLET |
| Surface Treatment | ZINC |
| Outlet Flange Mounting Hole Diameter | 0.688 INCHES NOMINAL FIRST OUTLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Flange Mounting Provision Spacing | 7.812 IN. BOLT CIRCLE DIA IN |
| Outlet Connection Type | FLANGE FIRST OUTLET |
| Outlet Location | CNETRALLY 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 |
|---|---|
| 81125S41-35781ALT3PCA | Naval Sea Systems Command (USA) |
| 330T648 PRIMARY | Hatch & Kirk, Inc. (USA) |
| 3304444 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3307648 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 26ABX1933A | 5/9 Secondary reference Engineering Specialties Co |
| 514SAM228A | 5/9 Secondary reference U.S. Government activity |
| 3304444 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 81125S41-35781ALT3PCA | 5/9 Secondary reference U.S. Government activity |
| 81125-S41-34480 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 2990-00-336-9933 is a Muffler,exhaust, manufactured by Hatch & Kirk, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-336-9933 has 3 manufacturer part numbers on file: 81125S41-35781ALT3PCA (Naval Sea Systems Command), 330T648 (Hatch & Kirk, Inc.), 3304444 (Hatch & Kirk, Inc.).
Key specifications for 330T648: Inlet Flange Shape: ROUND SINGLE INLET; Operating Position: VERTICAL; Inlet Location: LOCATED ON SIDE OF BODY; Coolant Type: AIR. 19 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.