The Pulley,groove, cataloged under National Stock Number 3020-01-438-7625, 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 28 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-438-7625 |
| Primary Part Number | SK463-3 |
| 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 | 7.0000 INCHES NOMINAL BOTH ENDS IN |
| Bore Feature | INCLUDED |
| Bearing Quantity | 1 |
| Securing Method | MOUNTED BETWEEN BRACKETS |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 3.5000 INCHES NOMINAL IN |
| Design Form | WEBBED |
| Web/spoke Relationship to Face Centerline | NOT OFFSET |
| Groove Shape | V |
| Outside Diameter | 22.5000 INCHES NOMINAL IN |
| Shaft Size for Which Designed | 3.2490 INCHES MINIMUM AND 3.2500 INCHES MAXIMUM IN |
| Style Designator | WEBBED OR SPOKED |
| Material Document and Classification | MIL-S-16974 MIL SPEC SINGLE MATERIAL RESPONSE OR AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 20.2500 INCHES NOMINAL IN |
| Groove Depth | 1.6850 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | INCLUDED |
| Groove Quantity | 1 |
| V Groove Angle in Deg | 30.0 |
| Protruding Hub Characteristic | PLAIN |
| Bearing Type | BEARING ROLLER |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 0.5000 INCHES NOMINAL BOTH ENDS IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 5.5085 INCHES MINIMUM AND 5.5095 INCHES MAXIMUM IN |
| Material | STEEL COMP 4140 AND STEEL OVERALL |
| Unable to Decode | UNABLE TO DECODE |
| 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 |
|---|---|
| 772-6361085 ITEM 4 | Naval Sea Systems Command (USA) |
| SK463-3 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6361085 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-438-7625 is a Pulley,groove, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-438-7625 has 2 manufacturer part numbers on file: 772-6361085 ITEM 4 (Naval Sea Systems Command), SK463-3 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 3020-01-438-7637, 3960-01-439-7498. Verify interchangeability with system specifications before substitution.
Key specifications for SK463-3: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 7.0000 INCHES NOMINAL BOTH ENDS IN; Bore Feature: INCLUDED; Bearing Quantity: 1. 28 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.