The Gear,spur, cataloged under National Stock Number 3020-01-321-6295, 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 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-321-6295 |
| Primary Part Number | 65850-05087-103 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Hub Spline Quantity | 37 FIRST END |
| Bore Nominal Diameter | 1.000 INCHES BOTH ENDS IN |
| Teeth Quantity | 21 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 1.500 INCHES SECOND END IN |
| Bore Style | W/COUNTERBORE SECOND END |
| Nominal Distance Between Body Face and Protruding Hub End | 1.340 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 2.430 INCHES FIRST END IN |
| First Step Nominal Length | 0.440 INCHES SECOND END IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 2.6250 INCHES NOMINAL IN |
| First Step Nominal Diameter | 2.250 INCHES SECOND END IN |
| Hub Style Designator | 1 STEP SECOND END |
| Hub Style Designator | EXTERNALLY SPLINED, STRAIGHT SPLINES FIRST END |
| End Nominal Length | 0.900 INCHES SECOND END IN |
| Nominal Outside Diameter | 2.873 INCHES IN |
| Hub Spline Nominal Major Diameter | 1.898 INCHES FIRST END IN |
| End Nominal Diameter | 1.986 INCHES SECOND END IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL COMP E9310 OVERALL |
| Counterbore Nominal Depth | 5.500 INCHES SECOND END IN |
| Face Nominal Width | 4.250 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 65850-05087-103 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| Reference | Meaning |
|---|---|
| 65850-05087 | D/9 Drawing number reference only Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
NSN 3020-01-321-6295 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 3020-01-321-6295 has 1 manufacturer part number on file: 65850-05087-103 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-379-2062. Verify interchangeability with system specifications before substitution.
Key specifications for 65850-05087-103: Hub Spline Quantity: 37 FIRST END; Bore Nominal Diameter: 1.000 INCHES BOTH ENDS IN; Teeth Quantity: 21; Body Style: PLAIN, SOLID. 23 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.
NSN 3020-01-321-6295 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.