The Muffler,exhaust, cataloged under National Stock Number 2990-00-689-3087, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Oshkosh Defense Llc. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-689-3087 |
| Primary Part Number | U18300F5 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Inlet Location | CENTRALLY LOCATED ON VERTICAL CENTER LINE 1-3/4 IN. C TO C ABOVE HORIZONTAL CENTER LINE IN END SECTION OF BODY IN |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 8.500 INCHES NOMINAL IN |
| Outlet Inside Diameter | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 2.500 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 2 |
| Muffler Design | BAFFLE |
| Tube Quantity | 2 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Inlet Inside Diameter | 3.500 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 2.500 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | LOCATED ON VERTICAL CENTER LINE 2.000 IN. C TO C BELOW HORIZONTAL CENTER LINE IN OPPOSITE END OF BODY IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2990-00-689-3087 is a Muffler,exhaust, manufactured by Oshkosh Defense Llc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-689-3087 has 2 manufacturer part numbers on file: 18300F5 (Oshkosh Defense Llc), U18300F5 (Oshkosh Defense Llc).
Key specifications for U18300F5: Inlet Location: CENTRALLY LOCATED ON VERTICAL CENTER LINE 1-3/4 IN. C TO C ABOVE HORIZONTAL CENTER LINE IN END SECTION OF BODY IN; Coolant Type: AIR; Design Type: DRY; Overall Diameter: 8.500 INCHES NOMINAL IN. 16 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.