The Gear,spur, cataloged under National Stock Number 3020-00-012-6052, 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 Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-012-6052 |
| Primary Part Number | S6137-23055-1 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Bore Nominal Diameter | 5.711 INCHES BOTH ENDS IN |
| Teeth Quantity | 54 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 6.180 INCHES FIRST END IN |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 5.222 INCHES FIRST END IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 8.675 INCHES IN |
| Criticality Code Justification | FEAT |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | AMS 6265 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.7500 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Spline Quantity | 109 FIRST END |
| Nominal Outside Diameter | 6.996 INCHES IN |
| Pressure Angle | 22.5000 DEGREES |
| Material | STEEL COMP E9310 OVERALL |
| Counterbore Nominal Depth | 1.990 INCHES FIRST END IN |
| Face Nominal Width | 3.435 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 |
|---|---|
| S6137-23055-1 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| S6137-23055-1 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| Reference | Meaning |
|---|---|
| S6137-23055-1 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-00-012-6052 is a Gear,spur, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-012-6052 has 2 manufacturer part numbers on file: S6137-23055-1 (Leonardo Spa Helicopters Division - Production Site), S6137-23055-1 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for S6137-23055-1: Bore Nominal Diameter: 5.711 INCHES BOTH ENDS IN; Teeth Quantity: 54; Body Style: PLAIN, SOLID; Counterbore Nominal Diameter: 6.180 INCHES FIRST END IN. 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.