The Pulley,groove, cataloged under National Stock Number 3020-01-438-7637, 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 Lake Shore Systems, Inc.. Government technical data includes 28 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-438-7637 |
| Primary Part Number | SK464-3 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Lake Shore Systems, Inc. |
| 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 | RETAINING PLATE AND RETAINING RING |
| 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 |
|---|---|
| SK464-3 | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 772-6361085 REV E ITEM NO 5 | 5/9 Secondary reference Naval Sea Systems Command |
| SK464-3 | 3/9 Design control — primary reference U.S. Government activity |
| SK464-3 | 5/9 Secondary reference Naval Sea Systems Command |
| 6361085 | D/9 Drawing number reference only Naval Sea Systems Command |
| 772-6361085 ITEM 5 | 5/9 Secondary reference U.S. Government activity |
| 772-6361085 ITEM 5 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 3020-01-438-7637 is a Pulley,groove, manufactured by Lake Shore Systems, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-438-7637 has 1 manufacturer part number on file: SK464-3 (Lake Shore Systems, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 3960-01-439-7498. Verify interchangeability with system specifications before substitution.
Key specifications for SK464-3: 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.