The Gear,bevel, cataloged under National Stock Number 3020-01-320-1781, 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 19 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-320-1781 |
| Primary Part Number | 236540-4 |
| Item Name | Gear,bevel |
| 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 |
| Bore Nominal Diameter | 1.700 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 3.750 INCHES FIRST END IN |
| Hub Nominal Diameter | 2.875 INCHES SECOND END IN |
| Teeth Quantity | 62 |
| Body Style | PLAIN, SOLID |
| Pitch Angle | 16.3200 DEGREES |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.550 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.527 INCHES FIRST END IN |
| Teeth Type | STRAIGHT |
| Nominal Overall Length | 2.500 INCHES IN |
| Style Designator | SIDE FACE, PROTRUDING HUBS |
| Pitch Diameter | 12.4000 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 6 BOTH ENDS |
| Nominal Outside Diameter | 12.488 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 1.200 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 |
|---|---|
| 236540-4 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 236540 | D/9 Drawing number reference only Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 3020-01-320-1781 is a Gear,bevel, 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 3020-01-320-1781 has 1 manufacturer part number on file: 236540-4 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-320-2715. Verify interchangeability with system specifications before substitution.
Key specifications for 236540-4: Bore Nominal Diameter: 1.700 INCHES BOTH ENDS IN; Hub Nominal Diameter: 3.750 INCHES FIRST END IN; Hub Nominal Diameter: 2.875 INCHES SECOND END IN; Teeth Quantity: 62. 19 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.