The Pulley,groove, cataloged under National Stock Number 3020-01-652-7634, 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 C E Niehoff & Co. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-652-7634 |
| Primary Part Number | N4051 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | C E Niehoff & Co |
| Status | ACTIVE |
| Groove Shape | U |
| Outside Diameter | 50.0 INCHES NOMINAL IN |
| Groove Depth | 16.0 INCHES NOMINAL IN |
| 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 |
|---|---|
| 7421503327 | Arquus (FRA) |
| 21503327 | Volvo Lastvagnar Aktiebolag (SWE) |
| N4051 PRIMARY | C E Niehoff & Co (USA) |
| Reference | Meaning |
|---|---|
| 21503327 | 5/9 Secondary reference Volvo Lastvagnar Ab - Volvo Truckcorp |
NSN 3020-01-652-7634 is a Pulley,groove, manufactured by C E Niehoff & Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-652-7634 has 3 manufacturer part numbers on file: 7421503327 (Arquus), 21503327 (Volvo Lastvagnar Aktiebolag), N4051 (C E Niehoff & Co).
Key specifications for N4051: Groove Shape: U; Outside Diameter: 50.0 INCHES NOMINAL IN; Groove Depth: 16.0 INCHES NOMINAL IN; Special Features: ZINC PLATED. 3 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.