The Muffler,exhaust, cataloged under National Stock Number 2990-01-603-4403, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Daimler Truck North America Llc. Government technical data includes 8 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-603-4403 |
| Primary Part Number | 04-21774-004 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Daimler Truck North America Llc |
| Status | ACTIVE |
| Operating Position | VERTICAL |
| Coolant Type | WATER |
| Design Type | DRY |
| Overall Diameter | 255.5 MILLIMETERS NOMINAL MM |
| Muffler Design | STRAIGHT THROUGH |
| Body Shape | ROUND |
| Surface Treatment | ALUMINUM ALLOY |
| Material | STEEL CORROSION RESISTING LOCATION NOT OTHERWISE SPECIFIED |
| 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 |
|---|---|
| 04-21774-004 PRIMARY | Daimler Truck North America Llc (USA) |
NSN 2990-01-603-4403 is a Muffler,exhaust, manufactured by Daimler Truck North America Llc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-603-4403 has 1 manufacturer part number on file: 04-21774-004 (Daimler Truck North America Llc).
Key specifications for 04-21774-004: Operating Position: VERTICAL; Coolant Type: WATER; Design Type: DRY; Overall Diameter: 255.5 MILLIMETERS NOMINAL MM. 8 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.