The Pulley,flat, cataloged under National Stock Number 3020-00-425-4531, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-425-4531 |
| Item Name | Pulley,flat |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 5.625 INCHES NOMINAL AA END IN |
| Hub Outside Diameter | 5.625 INCHES NOMINAL BB END IN |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 4.875 INCHES NOMINAL IN |
| Design Form | SPOKED |
| Web/spoke Relationship to Face Centerline | NOT OFFSET |
| Outside Diameter | 22.625 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Rim Type | SOLID |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Distance From Outside Flange/rim to Hub End and Location | 1.312 INCHES NOMINAL AA END AND 1.312 INCHES NOMINAL BB END IN |
| Keying Facility | NOT INCLUDED |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 4.124 INCHES MINIMUM AND 4.126 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Crown Face | INCLUDED |
| Face Width | 2.250 INCHES NOMINAL IN |
| Lightening Hole | NOT INCLUDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 265303A | 5/9 Secondary reference Lucas Western Inc |
| 271639 | D/9 Drawing number reference only Lucas Western Inc |
| 265303AA | 5/9 Secondary reference Lucas Western Inc |
| 609678K51 | 3/9 Design control — primary reference Lucas Western Inc |
NSN 3020-00-425-4531 is a Pulley,flat, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5306-01-129-6762. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-00-425-4531: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 5.625 INCHES NOMINAL AA END IN; Hub Outside Diameter: 5.625 INCHES NOMINAL BB END IN; Bore Feature: INCLUDED. 21 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.