The Gear,helical, cataloged under National Stock Number 3020-00-347-9380, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-347-9380 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Keyway Nominal Width | 0.376 INCHES FIRST END IN |
| Bore Nominal Diameter | 1.751 INCHES FIRST END IN |
| Helix Angle | 10.1500 DEGREES |
| Teeth Quantity | 39 |
| Second Step Nominal Diameter | 2.750 INCHES FIRST END IN |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Mounting Hole Type and Quantity | 2 THREADED AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 2.313 INCHES FIRST END IN |
| First Step Nominal Length | 0.923 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 32.0 ROCKWELL C NOMINAL OVERALL |
| Second Step Nominal Length | 0.640 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 4.9520 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 2.363 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Mounting Hole Nominal Thread Size | 0.250 INCHES AXIALLY THROUGH BODY FIRST END IN |
| End Nominal Length | 0.750 INCHES FIRST END IN |
| Nominal Outside Diameter | 5.1995 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.048 INCHES FIRST END IN |
| End Nominal Diameter | 2.372 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Bolt Hole Circle Nominal Diameter | 3.500 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH BODY FIRST END |
| Attachment Method | MOUNTING HOLE |
| 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 |
|---|---|
| 77923 | 5/9 Secondary reference U.S. Government activity |
| 7776C35 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-347-9380 is a Gear,helical, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-347-9380: Keyway Nominal Width: 0.376 INCHES FIRST END IN; Bore Nominal Diameter: 1.751 INCHES FIRST END IN; Helix Angle: 10.1500 DEGREES; Teeth Quantity: 39. 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.