The Gear,helical, cataloged under National Stock Number 3020-00-028-2673, 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 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-028-2673 |
| Primary Part Number | 591399 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | General Motors Llc Dba General Motors Llc |
| Status | ACTIVE |
| Helix Angle | 19.0000 DEGREES |
| Hub Nominal Diameter | 0.469 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.438 INCHES FIRST END IN |
| Teeth Quantity | 40 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | SERRATED BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.813 INCHES SECOND END IN |
| Serration Pitch Diameter | 1.0938 INCHES NOMINAL BOTH ENDS IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | CONE SHAPE BODY, PROTRUDING HUB, RECESSED HUB |
| Pitch Diameter | 5.9375 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 6.281 INCHES IN |
| Serration Quantity | 4 BOTH ENDS |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.766 INCHES 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 |
|---|---|
| 591399 PRIMARY | General Motors Llc Dba General Motors Llc (USA) |
| Reference | Meaning |
|---|---|
| 591399 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
| K345-4 | 5/9 Secondary reference Republic Gear Co |
NSN 3020-00-028-2673 is a Gear,helical, manufactured by General Motors Llc Dba General Motors Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-028-2673 has 1 manufacturer part number on file: 591399 (General Motors Llc Dba General Motors Llc).
Key specifications for 591399: Helix Angle: 19.0000 DEGREES; Hub Nominal Diameter: 0.469 INCHES FIRST END IN; Nominal Distance Between Body Face and Recessed Hub End: 0.438 INCHES FIRST END IN; Teeth Quantity: 40. 19 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.