The Gear,helical, cataloged under National Stock Number 3020-00-820-6147, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-820-6147 |
| Primary Part Number | 2121724 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Keyway Nominal Width | 0.126 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.747 INCHES BOTH ENDS IN |
| Helix Angle | 7.5000 DEGREES |
| Teeth Quantity | 10 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 90.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 94.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL |
| Style Designator | HUBLESS |
| Material Document and Classification | MIL-S-869,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 1.746 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.439 INCHES BOTH ENDS IN |
| Pressure Angle | 34.0000 DEGREES |
| Material | STEEL COMP EZ OVERALL |
| Face Nominal Width | 1.497 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 |
|---|---|
| 2121724 | Bae Systems Land & Armaments L.p. (USA) |
| 2121724 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 4320PL0927647 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 3020-00-820-6147 is a Gear,helical, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-820-6147 has 2 manufacturer part numbers on file: 2121724 (Bae Systems Land & Armaments L.p.), 2121724 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 2121724: Keyway Nominal Width: 0.126 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.747 INCHES BOTH ENDS IN; Helix Angle: 7.5000 DEGREES; Teeth Quantity: 10. 18 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.