The Pulley,flat, cataloged under National Stock Number 3020-01-254-9943, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 25 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-254-9943 |
| Item Name | Pulley,flat |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 0.626 INCHES NOMINAL AA END IN |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.800 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Outside Diameter | 0.750 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Material Document and Classification | QQ-A-225/8, ALLOY 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Rim Type | SOLID |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Counterbore Depth | 0.345 INCHES NOMINAL AND 0.120 INCHES NOMINAL IN |
| Counterbore Location | BOTH ENDS |
| Protruding Hub Characteristic | PLAIN |
| Counterbore Diameter | 0.500 INCHES NOMINAL AND 0.620 INCHES NOMINAL IN |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 0.580 INCHES NOMINAL AA END IN |
| Keying Facility | NOT INCLUDED |
| Counterbore Feature | INCLUDED |
| Bore Diameter | 0.375 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 6061 OVERALL |
| Crown Face | NOT INCLUDED |
| Face Width | 0.220 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 |
|---|---|
| 428423-001 | 3/9 Design control — primary reference Southeastern Engineering, Inc |
| 428423 | D/9 Drawing number reference only U.S. Government activity |
| 428423-001 | 5/2 Secondary reference U.S. Government activity |
NSN 3020-01-254-9943 is a Pulley,flat, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-254-9943: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 0.626 INCHES NOMINAL AA END IN; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED. 25 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.