The Gear,helical, cataloged under National Stock Number 3020-00-239-5551, 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 24 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-5551 |
| Primary Part Number | G6689PC92 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.249 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.188 INCHES BOTH ENDS IN |
| Helix Angle | 44.9764 DEGREES |
| Hub Nominal Diameter | 1.938 INCHES FIRST END IN |
| Hub Nominal Diameter | 1.938 INCHES SECOND END IN |
| Teeth Quantity | 74 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| 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 |
| Hardness Rating | 83.0 ROCKWELL C NOMINAL OVERALL |
| 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 | 5.5629 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 5.6629 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.724 INCHES AND 0.718 INCHES BOTH ENDS 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 |
| Part Number | Manufacturer |
|---|---|
| G6689PC92 PRIMARY | Siemens Energy, Inc. (USA) |
| G9625PC124 PRIMARY | Siemens Energy, Inc. (USA) |
| G7845PC124 PRIMARY | Siemens Energy, Inc. (USA) |
| G7840PC124 PRIMARY | Siemens Energy, Inc. (USA) |
| G6760PC92 PRIMARY | Siemens Energy, Inc. (USA) |
| G6766PC92 PRIMARY | Siemens Energy, Inc. (USA) |
| G6710PC92 PRIMARY | Siemens Energy, Inc. (USA) |
| G6684PC92 PRIMARY | Siemens Energy, Inc. (USA) |
| G9620PC124 PRIMARY | Siemens Energy, Inc. (USA) |
| G6716PC92 PRIMARY | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| W429BBSX3 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| W429BBSX3 | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 3020-00-239-5551 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-239-5551 has 10 manufacturer part numbers on file: G6689PC92 (Siemens Energy, Inc.), G9625PC124 (Siemens Energy, Inc.), G7845PC124 (Siemens Energy, Inc.), G7840PC124 (Siemens Energy, Inc.), G6760PC92 (Siemens Energy, Inc.) and 5 more.
Key specifications for G6689PC92: Keyway Nominal Width: 0.249 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.188 INCHES BOTH ENDS IN; Helix Angle: 44.9764 DEGREES; Hub Nominal Diameter: 1.938 INCHES FIRST END IN. 24 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.