The Gear,helical, cataloged under National Stock Number 3020-00-385-7953, 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 Army, United States Department of the Dba Rock Island Arsenal Jmtc. Government technical data includes 25 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-385-7953 |
| Primary Part Number | 8402616 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Army, United States Department of the Dba Rock Island Arsenal Jmtc |
| Status | ACTIVE |
| Helix Angle | 8.9583 DEGREES |
| Hub Nominal Diameter | 1.625 INCHES SECOND END IN |
| Hub Nominal Diameter | 1.625 INCHES FIRST END IN |
| Teeth Quantity | 27 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 1.125 INCHES SECOND END IN |
| Tooth Direction | LEFT |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.032 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.968 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 2.125 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 AISI/SAE 4145 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.4167 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 10 BOTH ENDS |
| Nominal Outside Diameter | 3.6667 INCHES IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL COMP 4142H OVERALL |
| Counterbore Nominal Depth | 1.429 INCHES SECOND END IN |
| Face Nominal Width | 1.125 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 |
|---|---|
| 8402616 PRIMARY | Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA) |
NSN 3020-00-385-7953 is a Gear,helical, manufactured by Army, United States Department of the Dba Rock Island Arsenal Jmtc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-385-7953 has 1 manufacturer part number on file: 8402616 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 8402616: Helix Angle: 8.9583 DEGREES; Hub Nominal Diameter: 1.625 INCHES SECOND END IN; Hub Nominal Diameter: 1.625 INCHES FIRST END IN; Teeth Quantity: 27. 25 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.