The Pulley,groove, cataloged under National Stock Number 3020-01-477-1081, 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 TB Woods's Corporation. Government technical data includes 17 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 | 3020-01-477-1081 |
| Primary Part Number | 643B |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | TB Woods's Corporation |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Bore Feature | INCLUDED |
| Design Form | PLAIN |
| Groove Shape | V |
| Outside Diameter | 6.750 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Pitch Diameter | 5.060 INCHES NOMINAL IN |
| Groove Depth | 0.438 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 3 |
| V Groove Angle in Deg | 34.0 |
| Distance From Outside Flange/rim to Hub End and Location | 1.812 INCHES NOMINAL AA END IN |
| Material | IRON OR IRON CAST OVERALL |
| Face Width | 2.500 INCHES NOMINAL IN |
| Groove Width | 0.656 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 |
| Part Number | Manufacturer |
|---|---|
| 643B PRIMARY | TB Woods's Corporation (USA) |
NSN 3020-01-477-1081 is a Pulley,groove, manufactured by TB Woods's Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-477-1081 has 1 manufacturer part number on file: 643B (TB Woods's Corporation).
Key specifications for 643B: Integral Cooling Vane: NOT INCLUDED; Bore Feature: INCLUDED; Design Form: PLAIN; Groove Shape: V. 17 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.