The Pulley,groove, cataloged under National Stock Number 3020-00-486-3740, 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 General Motors Llc Dba General Motors Llc. Government technical data includes 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-486-3740 |
| Primary Part Number | 3900434 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | General Motors Llc Dba General Motors Llc |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 3.250 INCHES NOMINAL AA END IN |
| Bore Feature | INCLUDED |
| Securing Method | DRILLED HOLE |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.125 INCHES NOMINAL IN |
| Design Form | WEBBED |
| Groove Shape | V |
| Outside Diameter | 7.125 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Pitch Diameter | 6.875 INCHES NOMINAL IN |
| Groove Depth | 0.500 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 1 |
| V Groove Angle in Deg | 42.0 |
| Protruding Hub Characteristic | PLAIN |
| Securing Hole Quantity | 4 |
| Bolt Circle Diameter | 1.750 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.312 INCHES NOMINAL IN |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 1.500 INCHES NOMINAL AA END AND 2.625 INCHES NOMINAL BB END IN |
| Hole Location | EQUALLY SPACED ON BODY |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.625 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Unable to Decode | UNABLE TO DECODE |
| Face Width | 1.250 INCHES NOMINAL IN |
| Groove Width | 0.500 INCHES NOMINAL IN |
| 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 |
|---|---|
| 3900434 PRIMARY | General Motors Llc Dba General Motors Llc (USA) |
| Reference | Meaning |
|---|---|
| 3900434 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
NSN 3020-00-486-3740 is a Pulley,groove, manufactured by General Motors Llc Dba General Motors Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-486-3740 has 1 manufacturer part number on file: 3900434 (General Motors Llc Dba General Motors Llc).
Key specifications for 3900434: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 3.250 INCHES NOMINAL AA END IN; Bore Feature: INCLUDED; Securing Method: DRILLED HOLE. 29 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.