The Gear,helical, cataloged under National Stock Number 3020-00-830-0331, 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 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-830-0331 |
| Primary Part Number | HD481KX3 |
| 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 | 9.9952 DEGREES |
| Teeth Quantity | 11 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS |
| Material Document and Classification | QQ-C-390 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.1220 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 2.421 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.609 INCHES BOTH ENDS IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | COPPER ALLOY 932 OVERALL |
| Face Nominal Width | 5.247 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 |
|---|---|
| HD481KX3 PRIMARY | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| H2431PC30 | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 3020-00-830-0331 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-830-0331 has 1 manufacturer part number on file: HD481KX3 (Siemens Energy, Inc.).
Key specifications for HD481KX3: Keyway Nominal Width: 0.188 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.000 INCHES BOTH ENDS IN; Helix Angle: 9.9952 DEGREES; Teeth Quantity: 11. 17 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.