The Gear,helical, cataloged under National Stock Number 3020-00-239-5531, 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 25 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through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-5531 |
| Primary Part Number | G7791PC116 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.187 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.750 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.250 INCHES FIRST END IN |
| Teeth Quantity | 58 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Mounting Hole Type and Quantity | 1 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.250 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Nominal Overall Length | 0.875 INCHES IN |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Material Document and Classification | MIL-S-890,CLASS AN MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.2336 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Mounting Hole Nominal Thread Size | 0.250 INCHES AXIALLY THROUGH BODY SECOND END IN |
| Nominal Outside Diameter | 4.3336 INCHES IN |
| Mounting Hole Thread Quantity Per Inch | 20 TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance From Bore Center to Keyway Bottom | 0.468 INCHES BOTH ENDS IN |
| Pressure Angle | 15.0000 DEGREES |
| Material | STEEL OVERALL |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH BODY SECOND END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.625 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 |
| Part Number | Manufacturer |
|---|---|
| G7791PC116 PRIMARY | Siemens Energy, Inc. (USA) |
| G7796PC116 PRIMARY | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| W416BS1X3 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| G9974PC116 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9747PC116 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| W416BS1X3 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9747PC116 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9752PC116 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| G9974PC116 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
| G9979PC116 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9752PC116 | 5/9 Secondary reference Siemens Energy, Inc. |
| G9979PC116 | 5/9 Secondary reference Imo Industries Inc Delroyd Worm Gear Div |
NSN 3020-00-239-5531 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-239-5531 has 2 manufacturer part numbers on file: G7791PC116 (Siemens Energy, Inc.), G7796PC116 (Siemens Energy, Inc.).
Key specifications for G7791PC116: Keyway Nominal Width: 0.187 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.750 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.250 INCHES FIRST END IN; Teeth Quantity: 58. 25 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.