The Pulley,flat, cataloged under National Stock Number 3020-01-311-9557, 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 Windham Lifts Inc. Government technical data includes 21 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-311-9557 |
| Primary Part Number | 51-033-2 |
| Item Name | Pulley,flat |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Windham Lifts Inc |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 1.300 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Flange Quantity | 2 |
| Outside Diameter | 3.750 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Outside Diameter | 4.250 INCHES NOMINAL IN |
| Rim Type | SOLID |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Keying Facility | NOT INCLUDED |
| Flange Width | 0.155 INCHES NOMINAL IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 1.570 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Flange Location | OUTSIDE |
| Crown Face | NOT INCLUDED |
| Face Width | 1.300 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 |
|---|---|
| 51-033-2 PRIMARY | Windham Lifts Inc (USA) |
NSN 3020-01-311-9557 is a Pulley,flat, manufactured by Windham Lifts Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-311-9557 has 1 manufacturer part number on file: 51-033-2 (Windham Lifts Inc).
Key specifications for 51-033-2: Integral Cooling Vane: NOT INCLUDED; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED; Bore Length: 1.300 INCHES NOMINAL IN. 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.