The Pulley,flat, cataloged under National Stock Number 3020-01-042-8177, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 28 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-042-8177 |
| Item Name | Pulley,flat |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 0.625 INCHES NOMINAL AA END IN |
| Bore Feature | INCLUDED |
| Securing Method | THREADED HOLE(S) |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 1.290 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Outside Diameter | 0.410 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Material Document and Classification | QQ-A-225/6, ALLOY 2024, T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Rim Type | SOLID |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Protruding Hub Characteristic | PLAIN |
| Securing Hole Quantity | 2 |
| Thread Size | 0.138-32 |
| Unable to Decode | UNABLE TO DECODE |
| Surface Treatment | ANODIZE |
| Distance From Outside Flange/rim to Hub End and Location | 0.717 INCHES NOMINAL AA END IN |
| Keying Facility | NOT INCLUDED |
| Hole Location | 0.440 IN. FROM HUB END,90 DEG APART IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.250 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Crown Face | INCLUDED |
| Face Width | 0.573 INCHES NOMINAL IN |
| Securing Location | AA END |
| 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 |
| Reference | Meaning |
|---|---|
| 454323 | 3/9 Design control — primary reference Miltope Corporation |
NSN 3020-01-042-8177 is a Pulley,flat, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5340-01-306-9944. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-042-8177: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 0.625 INCHES NOMINAL AA END IN; Bore Feature: INCLUDED; Securing Method: THREADED HOLE(S). 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.