The Gear,spur, cataloged under National Stock Number 3020-00-494-4609, 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 Leonardo Spa Helicopters Division - Production Site. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-494-4609 |
| Primary Part Number | 212-040-687-1 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Leonardo Spa Helicopters Division - Production Site |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.000 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 3.427 INCHES FIRST END IN |
| Teeth Quantity | 60 |
| Body Style | WEBBED, SOLID |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.717 INCHES FIRST END IN |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 1.092 INCHES IN |
| Criticality Code Justification | FEAT |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Pitch Diameter | 5.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Spline Quantity | 30 BOTH ENDS |
| Nominal Outside Diameter | 5.168 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Spline Pitch Diameter | 3.0000 INCHES NOMINAL BOTH ENDS IN |
| Body Recess Nominal Depth | 0.092 INCHES SECOND END IN |
| Face Nominal Width | 0.375 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 212-040-687-1 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| Reference | Meaning |
|---|---|
| 212-040-687-001 | 3/2 Design control — primary reference U.S. Government activity |
| 212-040-687-1 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-00-494-4609 is a Gear,spur, manufactured by Leonardo Spa Helicopters Division - Production Site, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-494-4609 has 1 manufacturer part number on file: 212-040-687-1 (Leonardo Spa Helicopters Division - Production Site).
Key specifications for 212-040-687-1: Bore Nominal Diameter: 3.000 INCHES BOTH ENDS IN; Hub Nominal Diameter: 3.427 INCHES FIRST END IN; Teeth Quantity: 60; Body Style: WEBBED, SOLID. 20 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.