The Gear,helical, cataloged under National Stock Number 3020-01-386-3391, 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 Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-386-3391 |
| Primary Part Number | 43042-212-00085-6 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic |
| Status | ACTIVE |
| Keyway Nominal Width | 0.189 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.875 INCHES BOTH ENDS IN |
| Helix Angle | 19.4630 DEGREES |
| Hub Nominal Diameter | 1.380 INCHES FIRST END IN |
| Teeth Quantity | 50 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.076 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 5.3030 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 5.498 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.500 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8620 OVERALL |
| Face Nominal Width | 0.620 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 |
|---|---|
| 43042-212-00085-6 PRIMARY | Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic (USA) |
| Reference | Meaning |
|---|---|
| 43042-212-00085 | D/9 Drawing number reference only Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic |
NSN 3020-01-386-3391 is a Gear,helical, manufactured by Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-386-3391 has 1 manufacturer part number on file: 43042-212-00085-6 (Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-386-4527. Verify interchangeability with system specifications before substitution.
Key specifications for 43042-212-00085-6: Keyway Nominal Width: 0.189 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.875 INCHES BOTH ENDS IN; Helix Angle: 19.4630 DEGREES; Hub Nominal Diameter: 1.380 INCHES FIRST END IN. 18 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.