The Pulley,groove, cataloged under National Stock Number 3020-01-484-7631, 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 Naval Sea Systems Command. Government technical data includes 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-484-7631 |
| Primary Part Number | 122-6776889 PC 1 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 2.5000 INCHES NOMINAL BOTH ENDS IN |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Design Form | PLAIN |
| Groove Radius | 1.0000 INCHES NOMINAL IN |
| Groove Shape | U |
| Outside Diameter | 5.6875 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Groove Depth | 0.6875 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 1 |
| Counterbore Location | BB END |
| Protruding Hub Characteristic | PLAIN |
| Counterbore Diameter | 1.8510 INCHES MINIMUM AND 1.8530 INCHES MAXIMUM IN |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 0.0600 INCHES MINIMUM BOTH ENDS AND 0.0650 INCHES MAXIMUM BOTH ENDS IN |
| Counterbore Feature | INCLUDED |
| Material | STEEL OVERALL |
| Face Width | 1.5000 INCHES NOMINAL IN |
| Groove Width | 1.5000 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 |
|---|---|
| 122-6776889 PC 1 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6776889 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-484-7631 is a Pulley,groove, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-484-7631 has 1 manufacturer part number on file: 122-6776889 PC 1 (Naval Sea Systems Command).
Key specifications for 122-6776889 PC 1: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 2.5000 INCHES NOMINAL BOTH ENDS IN; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED. 23 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.