The Muffler,exhaust, cataloged under National Stock Number 2990-00-830-6555, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Cummins Filtration Inc.. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 2990-00-830-6555 |
| Primary Part Number | T-7647 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Cummins Filtration Inc. |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Outside Diameter | 2.520 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | LOCATED ON HORIZONTAL CENTERLINE 2.500 IN. FROM END IN |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 6.625 INCHES NOMINAL IN |
| Outlet Inside Diameter | 1.943 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 3.000 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 4 |
| Muffler Design | BAFFLE |
| Outlet Outside Diameter | 2.063 INCHES NOMINAL FIRST OUTLET IN |
| Tube Quantity | 2 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Surface Treatment | ALUMINUM |
| Inlet Inside Diameter | 2.400 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 10.125 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | LOCATED IN UPPER PORTION OF 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 |
NSN 2990-00-830-6555 is a Muffler,exhaust, manufactured by Cummins Filtration Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-830-6555 has 2 manufacturer part numbers on file: JC-1112 (Fabco Generators, Inc. Dba Fabco Power), T-7647 (Cummins Filtration Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 6625-01-043-7472, 4930-01-386-3325. Verify interchangeability with system specifications before substitution.
Key specifications for T-7647: Operating Position: HORIZONTAL; Inlet Outside Diameter: 2.520 INCHES NOMINAL SINGLE INLET IN; Inlet Location: LOCATED ON HORIZONTAL CENTERLINE 2.500 IN. FROM END IN; Coolant Type: AIR. 20 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.