The Pulley,timing Belt, cataloged under National Stock Number 3020-01-178-9947, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Raytheon Company Dba Raytheon Co. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-178-9947 |
| Primary Part Number | 554781-1 |
| Item Name | Pulley,timing Belt |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Raytheon Company Dba Raytheon Co |
| Status | ACTIVE |
| Hub Diameter | 0.880 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE II,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE |
| Face Type | FLAT GROOVED WITH DOUBLE FLANGE |
| Material Document and Classification | ASTM STD B211,T6 ASSN STD SINGLE MATERIAL RESPONSE |
| Bore Type | SPECIFIED |
| Face Groove/tooth Quantity | 41 |
| Surface Treatment | ANODIZE |
| Bore Diameter | 0.625 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 6061 |
| Face Width | 0.377 INCHES MINIMUM AND 0.379 INCHES MAXIMUM 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 3020-01-178-9947 is a Pulley,timing Belt, manufactured by Raytheon Company Dba Raytheon Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-178-9947 has 2 manufacturer part numbers on file: 554781-1 (Raytheon Company), 554781-1 (Raytheon Company Dba Raytheon Co).
Key specifications for 554781-1: Hub Diameter: 0.880 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE II,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE; Face Type: FLAT GROOVED WITH DOUBLE FLANGE; Material Document and Classification: ASTM STD B211,T6 ASSN STD SINGLE MATERIAL RESPONSE. 10 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.