The Gear,helical, cataloged under National Stock Number 3020-01-379-3087, 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 Naval Sea Systems Command. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-379-3087 |
| Primary Part Number | 5493136 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.500 INCHES BOTH ENDS IN |
| Helix Angle | 11.2500 DEGREES |
| Hub Nominal Diameter | 0.750 INCHES FIRST END IN |
| Hub Nominal Diameter | 0.890 INCHES SECOND END IN |
| Teeth Quantity | 20 |
| Surface Treatment Document and Classification | QQ-P-35,TYPE II FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 1 PLAIN TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.030 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.260 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 9 |
| Mounting Hole Nominal Diameter | 0.180 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | ASTM-A-582,COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.2745 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 1.400 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 416 OVERALL |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.450 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 |
NSN 3020-01-379-3087 is a Gear,helical, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-379-3087 has 2 manufacturer part numbers on file: 5493136 (Raytheon Company), 5493136 (Naval Sea Systems Command).
Key specifications for 5493136: Bore Nominal Diameter: 0.500 INCHES BOTH ENDS IN; Helix Angle: 11.2500 DEGREES; Hub Nominal Diameter: 0.750 INCHES FIRST END IN; Hub Nominal Diameter: 0.890 INCHES SECOND END IN. 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.
NSN 3020-01-379-3087 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.