The Gear,helical, cataloged under National Stock Number 3020-00-289-7963, 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 Fairbanks Morse, Llc. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 14 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-289-7963 |
| Primary Part Number | 15ADD8660APC24 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Keyway Nominal Width | 0.500 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.3250 INCHES FIRST END IN |
| Helix Angle | 23.2200 DEGREES |
| Nominal Distance Between Body Face and Recessed Hub End | 0.125 INCHES SECOND END IN |
| Teeth Quantity | 45 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.375 INCHES FIRST END IN |
| First Step Nominal Length | 0.250 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 27.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | ONE PROTRUDING HUB, ONE RECESSED HUB |
| Material Document and Classification | MIL-S-890,ALLOY NO. 2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.2960 INCHES NOMINAL IN |
| First Step Nominal Diameter | 2.375 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| End Nominal Length | 0.125 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.5177 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 1.375 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 |
|---|---|
| 15ADD8660APC24 PRIMARY | Fairbanks Morse, Llc (USA) |
| 13ADD8660APC24 PRIMARY | Fairbanks Morse, Llc (USA) |
| ADD8652B PRIMARY | Fairbanks Morse, Llc (USA) |
| MADG8660APC24 PRIMARY | Fairbanks Morse, Llc (USA) |
| MAADG8660APC24 PRIMARY | Fairbanks Morse, Llc (USA) |
| MADG8660BPC24 PRIMARY | Fairbanks Morse, Llc (USA) |
| 13ADD8660BPC24 PRIMARY | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| ADD8652B | 5/9 Secondary reference U.S. Government activity |
| 13ADD8660BPC24 | 5/9 Secondary reference U.S. Government activity |
| AVP10S61-01035PC24 | 3/2 Design control — primary reference U.S. Government activity |
| AVP10S61-01036PC24 | 3/2 Design control — primary reference U.S. Government activity |
| SS228S41-0611PC24 | 3/2 Design control — primary reference U.S. Government activity |
| MADG8660APC24 | 5/9 Secondary reference U.S. Government activity |
| 15ADD8660APC24 | 5/9 Secondary reference U.S. Government activity |
| MAADG8660APC24 | 5/9 Secondary reference U.S. Government activity |
| 13ADD8660APC24 | 5/9 Secondary reference U.S. Government activity |
| 81223S41-977PC24 | 3/2 Design control — primary reference U.S. Government activity |
| MADG8660BPC24 | 5/9 Secondary reference U.S. Government activity |
| 81223S4105-538642PC24 | 3/2 Design control — primary reference U.S. Government activity |
| SS228S41-0612PC24 | 3/2 Design control — primary reference U.S. Government activity |
| 81223S41-978PC24 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-289-7963 is a Gear,helical, manufactured by Fairbanks Morse, Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-289-7963 has 7 manufacturer part numbers on file: 15ADD8660APC24 (Fairbanks Morse, Llc), 13ADD8660APC24 (Fairbanks Morse, Llc), ADD8652B (Fairbanks Morse, Llc), MADG8660APC24 (Fairbanks Morse, Llc), MAADG8660APC24 (Fairbanks Morse, Llc) and 2 more.
Key specifications for 15ADD8660APC24: Keyway Nominal Width: 0.500 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.3250 INCHES FIRST END IN; Helix Angle: 23.2200 DEGREES; Nominal Distance Between Body Face and Recessed Hub End: 0.125 INCHES SECOND END IN. 22 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.