The Gear,helical, cataloged under National Stock Number 3020-00-239-5503, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-5503 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Helix Angle | 44.3386 DEGREES |
| Hub Nominal Diameter | 1.938 INCHES FIRST END IN |
| Hub Nominal Diameter | 1.563 INCHES SECOND END IN |
| Teeth Quantity | 69 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | LEFT |
| Nominal Distance Between Body Face and Protruding Hub End | 0.500 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.563 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Nominal Overall Length | 1.562 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-890,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.1322 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 5.2322 INCHES IN |
| Pressure Angle | 15.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.500 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 |
| Reference | Meaning |
|---|---|
| G9884PC129 | 3/9 Design control — primary reference Imo Industries Inc Delroyd Worm Gear Div |
| W429AS1X6 | 5/9 Secondary reference Siemens Energy, Inc. |
| W429AS1X6 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| G9892PC129 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| G9884PC129 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9892PC129 | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 3020-00-239-5503 is a Gear,helical, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-239-5503: Helix Angle: 44.3386 DEGREES; Hub Nominal Diameter: 1.938 INCHES FIRST END IN; Hub Nominal Diameter: 1.563 INCHES SECOND END IN; Teeth Quantity: 69. 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.