The Pulley,flat, cataloged under National Stock Number 3020-01-435-5517, 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 Brewer Machine & Gear Co. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-435-5517 |
| Primary Part Number | BF 4501 |
| Item Name | Pulley,flat |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Brewer Machine & Gear Co |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Bore Feature | INCLUDED |
| Bearing Quantity | 1 |
| Split Hub Feature | NOT INCLUDED |
| Design Form | WEBBED |
| Web/spoke Relationship to Face Centerline | NOT OFFSET |
| Flange Quantity | 2 |
| Outside Diameter | 4.0000 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Outside Diameter | 4.5000 INCHES NOMINAL IN |
| Rim Type | SOLID |
| Bore Type | STRAIGHT |
| Bearings | INCLUDED |
| Bearing Type | NEEDLE ROLLER |
| Flange Width | 0.1150 INCHES NOMINAL IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.6690 INCHES NOMINAL IN |
| Flange Location | OUTSIDE |
| Crown Face | INCLUDED |
| Face Width | 1.2300 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 |
|---|---|
| 593-6960926 | Naval Sea Systems Command (USA) |
| 593-6960625 | Naval Sea Systems Command (USA) |
| BF 4501 PRIMARY | Brewer Machine & Gear Co (USA) |
| Reference | Meaning |
|---|---|
| 6960625 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-435-5517 is a Pulley,flat, manufactured by Brewer Machine & Gear Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-435-5517 has 3 manufacturer part numbers on file: 593-6960926 (Naval Sea Systems Command), 593-6960625 (Naval Sea Systems Command), BF 4501 (Brewer Machine & Gear Co).
Key specifications for BF 4501: Integral Cooling Vane: NOT INCLUDED; Bore Feature: INCLUDED; Bearing Quantity: 1; Split Hub Feature: NOT INCLUDED. 21 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.