The Pulley,groove, cataloged under National Stock Number 3020-01-412-1678, 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 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-412-1678 |
| Primary Part Number | 802-5773417 PC 21 |
| 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 | 3.500 INCHES NOMINAL BOTH ENDS IN |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 3.500 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Outside Diameter | 11.000 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 1.125 INCHES NOMINAL BOTH ENDS IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 1.752 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Unable to Decode | UNABLE TO DECODE |
| Face Width | 1.000 INCHES NOMINAL IN |
| Lightening Hole | 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 |
|---|---|
| 802-5773417 PC 21 | Naval Sea Systems Command (USA) |
| 5773417 PC 21 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 802-5773417 | D/9 Drawing number reference only Naval Sea Systems Command |
| D204811G001 ITEM 21 | 5/2 Secondary reference U.S. Government activity |
| 5773417 | D/9 Drawing number reference only Naval Sea Systems Command |
| D204811G001 | D/9 Drawing number reference only U.S. Government activity |
| D204811G001-21 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-412-1678 is a Pulley,groove, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-412-1678 has 2 manufacturer part numbers on file: 802-5773417 PC 21 (Naval Sea Systems Command), 5773417 PC 21 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-412-2692, 3960-01-439-7497. Verify interchangeability with system specifications before substitution.
Key specifications for 802-5773417 PC 21: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 3.500 INCHES NOMINAL BOTH ENDS IN; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED. 18 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.