The Muffler,exhaust, cataloged under National Stock Number 2990-01-567-0461, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Mcmaster-Carr Supply Company. Government technical data includes 2 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 | 2990-01-567-0461 |
| Primary Part Number | 4450K3 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Mcmaster-Carr Supply Company |
| Status | ACTIVE |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Material | STEEL 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 |
|---|---|
| 4450K3 PRIMARY | Mcmaster-Carr Supply Company (USA) |
NSN 2990-01-567-0461 is a Muffler,exhaust, manufactured by Mcmaster-Carr Supply Company, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-567-0461 has 1 manufacturer part number on file: 4450K3 (Mcmaster-Carr Supply Company).
Key specifications for 4450K3: Overall Length: 1.500 INCHES NOMINAL IN; Inlet Thread Series Designator: NPT SINGLE INLET; Special Features: MAX PSI 300; HEX STYLE NPT MALE; FILTRATION RATING SI 40 MICRONS; HEX STYLE MUFFLERS HAVE A POROUS BRONZE ELEMENT BONDED TO A PIPE FITTING WITH HEXWRENCH FLATS. THEY REDUCE NOISE BY 15-20 DECIBELS; Material: STEEL LOCATION NOT OTHERWISE SPECIFIED. 2 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.