The Muffler,exhaust-Intake, cataloged under National Stock Number 2990-01-342-9118, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 3 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-342-9118 |
| Primary Part Number | 554-6404696 ASSY 95 |
| Item Name | Muffler,exhaust-Intake |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Coolant Type | AIR |
| Design Type | DRY |
| Body Shape | RECTANGULAR |
| 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 |
|---|---|
| 554-6404696 ASSY 95 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 554-6404696 | D/9 Drawing number reference only Naval Sea Systems Command |
| DF2740-2303 ASSY 95 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| DF2740-2303 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 6404696 ASSY 95 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 2990-01-342-9118 is a Muffler,exhaust-Intake, manufactured by Naval Sea Systems Command, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-342-9118 has 1 manufacturer part number on file: 554-6404696 ASSY 95 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-644-6197, 5365-01-658-1581. Verify interchangeability with system specifications before substitution.
Key specifications for 554-6404696 ASSY 95: Coolant Type: AIR; Design Type: DRY; Overall Length: 12.000 INCHES NOMINAL IN; Overall Width: 8.625 INCHES NOMINAL IN. 3 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.