The Gear,helical, cataloged under National Stock Number 3020-00-239-5545, 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 Siemens Energy, Inc.. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-5545 |
| Primary Part Number | HD481FX1 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.188 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.000 INCHES BOTH ENDS IN |
| Helix Angle | 16.7919 DEGREES |
| Teeth Quantity | 11 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 1.2500 INCHES FIRST END IN |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS |
| Pitch Diameter | 2.1220 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 2.4215 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.600 INCHES BOTH ENDS IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.062 INCHES BOTH ENDS IN |
| Face Nominal Width | 2.625 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 |
NSN 3020-00-239-5545 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-239-5545 has 2 manufacturer part numbers on file: HD481FX1 (Siemens Energy, Inc.), C32130PC2 (Siemens Energy, Inc.).
Key specifications for HD481FX1: Keyway Nominal Width: 0.188 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.000 INCHES BOTH ENDS IN; Helix Angle: 16.7919 DEGREES; Teeth Quantity: 11. 18 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.