The Gear,helical, cataloged under National Stock Number 3020-00-294-7755, 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 14 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-294-7755 |
| Primary Part Number | HD264C |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.375 INCHES BOTH ENDS IN |
| Teeth Quantity | 17 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | FLATTED SIDES BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS |
| Bore Nominal Depth | 1.496 INCHES BOTH ENDS IN |
| Pitch Diameter | 3.7210 INCHES NOMINAL IN |
| Nominal Outside Diameter | 4.0260 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.945 INCHES AND 0.940 INCHES BOTH ENDS IN |
| Pressure Angle | 30.0000 DEGREES |
| Material | STEEL COMP 1040 OVERALL |
| Face Nominal Width | 3.250 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 |
|---|---|
| HD264C PRIMARY | Siemens Energy, Inc. (USA) |
NSN 3020-00-294-7755 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-294-7755 has 1 manufacturer part number on file: HD264C (Siemens Energy, Inc.).
Key specifications for HD264C: Keyway Nominal Width: 0.375 INCHES BOTH ENDS IN; Teeth Quantity: 17; Body Style: PLAIN, SOLID; Tooth Direction: LEFT. 14 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.