The Gear,worm, cataloged under National Stock Number 3020-01-414-4393, 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 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-414-4393 |
| Primary Part Number | 845-6556509 |
| Item Name | Gear,worm |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Thread Form Direction | LEFT-HAND |
| Bore Nominal Diameter | 3.400 INCHES BOTH ENDS IN |
| Helix Angle | 6.1702 DEGREES |
| Hub Nominal Diameter | 4.240 INCHES SECOND END IN |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.314 INCHES SECOND END IN |
| Face Type | STRAIGHT |
| Hardness Rating | 175.0 BRINELL HULTGREN MINIMUM AND 250.0 BRINELL HULTGREN MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Material Document and Classification | ASTM B-584 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.6071 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 35 BOTH ENDS |
| Thread Form Quantity | 10 |
| Nominal Outside Diameter | 6.750 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | BRONZE OVERALL |
| Spline Pitch Diameter | 3.5000 INCHES NOMINAL BOTH ENDS IN |
| Body Recess Nominal Depth | 0.301 INCHES FIRST END IN |
| Face Nominal Width | 0.655 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 |
|---|---|
| 845-6603141-60 | Naval Sea Systems Command (USA) |
| 845-6556509 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6556509 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-414-4393 is a Gear,worm, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-414-4393 has 2 manufacturer part numbers on file: 845-6603141-60 (Naval Sea Systems Command), 845-6556509 (Naval Sea Systems Command).
Key specifications for 845-6556509: Thread Form Direction: LEFT-HAND; Bore Nominal Diameter: 3.400 INCHES BOTH ENDS IN; Helix Angle: 6.1702 DEGREES; Hub Nominal Diameter: 4.240 INCHES SECOND END IN. 20 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.