The Pulley,groove, cataloged under National Stock Number 3020-00-640-2902, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-640-2902 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 3.375 INCHES NOMINAL BOTH ENDS IN |
| Bore Feature | INCLUDED |
| Bearing Quantity | 2 |
| Securing Method | DRILLED HOLE |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 2.500 INCHES NOMINAL IN |
| Design Form | WEBBED |
| Unable to Decode | UNABLE TO DECODE |
| Web/spoke Relationship to Face Centerline | NOT OFFSET |
| First Step Face Largest Diameter and Location | 3.750 INCHES NOMINAL BOTH ENDS IN |
| Groove Radius | 0.484 INCHES NOMINAL IN |
| Groove Shape | U |
| Outside Diameter | 14.875 INCHES NOMINAL IN |
| Distance From Outside Flange/rim to Hub End and Location | 0.438 INCHES NOMINAL BOTH ENDS IN |
| Second Step Length | 0.250 INCHES NOMINAL BOTH ENDS IN |
| Style Designator | WEBBED OR SPOKED |
| Material Document and Classification | MIL-S-6758, COND N MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Groove Depth | 0.875 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | INCLUDED |
| Groove Quantity | 1 |
| Protruding Hub Characteristic | STEPPED |
| Unable to Decode | UNABLE TO DECODE |
| First Step Length | 0.188 INCHES NOMINAL BOTH ENDS IN |
| Securing Hole Quantity | 2 |
| Bolt Circle Diameter | 8.500 INCHES NOMINAL IN |
| Drilled Hole Diameter | 1.125 INCHES NOMINAL IN |
| Bearing Type | FLANGED |
| 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 |
|---|---|
| 400051-1 | 5/2 Secondary reference U.S. Government activity |
| 92756-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-640-2902 is a Pulley,groove, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5360-01-179-7352, 5950-01-425-1884. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-00-640-2902: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 3.375 INCHES NOMINAL BOTH ENDS IN; Bore Feature: INCLUDED; Bearing Quantity: 2. 29 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.