The Gear,helical, cataloged under National Stock Number 3020-00-385-9487, 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 23 specifications, cited from the U.S. Government catalog. The record lists 21 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-385-9487 |
| Primary Part Number | G6641PC76 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Helix Angle | 15.0000 DEGREES |
| Hub Nominal Diameter | 1.250 INCHES SECOND END IN |
| Teeth Quantity | 18 |
| Second Step Nominal Diameter | 1.250 INCHES FIRST END IN |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Nominal Distance Between Body Face and Protruding Hub End | 2.250 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.875 INCHES SECOND END IN |
| First Step Nominal Length | 1.120 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Second Step Nominal Length | 1.125 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 2.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 1.000 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| End Nominal Length | 0.005 INCHES FIRST END IN |
| Nominal Outside Diameter | 2.222 INCHES IN |
| End Nominal Diameter | 0.750 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | COPPER ALLOY OVERALL |
| Face Nominal Width | 1.750 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 |
|---|---|
| G6641PC76 | Siemens Energy, Inc. (USA) |
| G7624PC78 | Siemens Energy, Inc. (USA) |
| G9674PC76 | Siemens Energy, Inc. (USA) |
| G777PC76 | Siemens Energy, Inc. (USA) |
| G9731PC76 | Circor Pumps North America Llc (USA) |
| G7629PC78 | Siemens Energy, Inc. (USA) |
| G7709PC83 | Siemens Energy, Inc. (USA) |
| G7714PC83 | Siemens Energy, Inc. (USA) |
| G7946PC76 | Siemens Energy, Inc. (USA) |
| G7646PC78 | Siemens Energy, Inc. (USA) |
| G7651PC78 | Siemens Energy, Inc. (USA) |
| G6735PC78 | Siemens Energy, Inc. (USA) |
| G9669PC76 | Siemens Energy, Inc. (USA) |
| G7777PC76 | Siemens Energy, Inc. (USA) |
| G7704PC84 | Siemens Energy, Inc. (USA) |
| G7782PC76 | Siemens Energy, Inc. (USA) |
| G6636PC76 | Siemens Energy, Inc. (USA) |
| G7699PC84 | Siemens Energy, Inc. (USA) |
| G9726PC76 | Circor Pumps North America Llc (USA) |
| G7941PC76 | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| G969PC76 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9731PC76 | 5/9 Secondary reference Siemens Energy, Inc. |
| W97CS | 3/9 Design control — primary reference Imo Industries Inc Delroyd Worm Gear Div |
| G969PC76 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| G9726PC76 | 5/9 Secondary reference Siemens Energy, Inc. |
| W97CS | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 3020-00-385-9487 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-385-9487 has 21 manufacturer part numbers on file: G6641PC76 (Siemens Energy, Inc.), G7624PC78 (Siemens Energy, Inc.), G9674PC76 (Siemens Energy, Inc.), G777PC76 (Siemens Energy, Inc.), G9731PC76 (Circor Pumps North America Llc) and 16 more.
Key specifications for G6641PC76: Helix Angle: 15.0000 DEGREES; Hub Nominal Diameter: 1.250 INCHES SECOND END IN; Teeth Quantity: 18; Second Step Nominal Diameter: 1.250 INCHES FIRST END IN. 23 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.