The Gear,worm, cataloged under National Stock Number 3020-00-385-7975, 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 22 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 | 3020-00-385-7975 |
| Primary Part Number | 8404000 |
| Item Name | Gear,worm |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Army, United States Department of the Dba Rock Island Arsenal Jmtc |
| Status | ACTIVE |
| Thread Form Direction | LEFT-HAND |
| Helix Angle | 30.0000 DEGREES |
| Second Step Nominal Diameter | 1.389 INCHES SECOND END IN |
| Surface Treatment Document and Classification | MIL-P-16232,TYPE Z,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE AND MIL-P-16232,TYPE Z,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Nominal Distance Between Body Face and Protruding Hub End | 1.937 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 5.156 INCHES FIRST END IN |
| First Step Nominal Length | 0.500 INCHES SECOND END IN |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 9.719 INCHES IN |
| Second Step Nominal Length | 0.687 INCHES SECOND END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 1.6539 INCHES NOMINAL IN |
| First Step Nominal Diameter | 1.625 INCHES SECOND END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Thread Form Quantity | 6 |
| End Nominal Length | 0.750 INCHES SECOND END IN |
| Nominal Outside Diameter | 1.850 INCHES IN |
| Surface Treatment | PHOSPHATE ZINC OVERALL |
| End Nominal Diameter | 1.377 INCHES SECOND END IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 2.625 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 |
|---|---|
| 8404000 PRIMARY | Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA) |
NSN 3020-00-385-7975 is a Gear,worm, 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 3020-00-385-7975 has 1 manufacturer part number on file: 8404000 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 8404000: Thread Form Direction: LEFT-HAND; Helix Angle: 30.0000 DEGREES; Second Step Nominal Diameter: 1.389 INCHES SECOND END IN; Surface Treatment Document and Classification: MIL-P-16232,TYPE Z,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE AND MIL-P-16232,TYPE Z,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 22 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.