The Gear,helical, cataloged under National Stock Number 3020-00-385-7954, 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 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-385-7954 |
| Primary Part Number | 8402617 |
| 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 | 0.450 INCHES FIRST END IN |
| Hub Nominal Diameter | 1.445 INCHES SECOND END IN |
| Teeth Quantity | 54 |
| Surface Treatment Document and Classification | MIL-C-16232 TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | WEBBED, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.032 INCHES BOTH ENDS IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 1.188 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 AISI/SAE 1045 FED STD 1ST MATERIAL RESPONSE AND 66 AISI/SAE 1050 FED STD 2ND MATERIAL RESPONSE AND QQ-S-624 FED SPEC 3RD MATERIAL RESPONSE AND QQ-S-624 FED SPEC 4TH MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.8330 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 10 BOTH ENDS |
| Nominal Outside Diameter | 7.0833 INCHES IN |
| Surface Treatment | PHOSPHATE ZINC OVERALL |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL COMP 1045 AND STEEL COMP 1050 AND STEEL COMP 4130 AND STEEL COMP 4145 OVERALL |
| 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 |
|---|---|
| 8402617 PRIMARY | Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA) |
NSN 3020-00-385-7954 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 3020-00-385-7954 has 1 manufacturer part number on file: 8402617 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 8402617: Helix Angle: 8.9583 DEGREES; Hub Nominal Diameter: 0.450 INCHES FIRST END IN; Hub Nominal Diameter: 1.445 INCHES SECOND END IN; Teeth Quantity: 54. 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.
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.