The Muffler,exhaust, cataloged under National Stock Number 2990-00-459-6732, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-459-6732 |
| Primary Part Number | 8S2809 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Outside Diameter | 4.500 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | CENTERED ON END OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Outlet Inside Diameter | 4.375 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 3.500 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | BAFFLE |
| Outlet Outside Diameter | 4.500 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Surface Treatment | CADMIUM |
| Inlet Inside Diameter | 4.375 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 4.500 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | CENTERED ON END 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 |
|---|---|
| 8S2809 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 8S2809 | 5/9 Secondary reference Holt Bros |
| IPD8S2809 | 5/9 Secondary reference Industrial Parts Depot, Llc Dba Ipd |
NSN 2990-00-459-6732 is a Muffler,exhaust, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-459-6732 has 1 manufacturer part number on file: 8S2809 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 8S2809: Operating Position: HORIZONTAL; Overall Height: 6.750 INCHES NOMINAL IN; Inlet Outside Diameter: 4.500 INCHES NOMINAL SINGLE INLET IN; Inlet Location: CENTERED ON END OF BODY. 17 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.