The Gear,helical, cataloged under National Stock Number 3020-01-251-5885, 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 21 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 | 3020-01-251-5885 |
| Primary Part Number | 5210198 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Keyway Nominal Width | 1.001 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 4.251 INCHES BOTH ENDS IN |
| Helix Angle | 17.9960 DEGREES |
| Hub Nominal Diameter | 6.300 INCHES BOTH ENDS IN |
| Teeth Quantity | 27 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.800 INCHES BOTH ENDS IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.0856 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 7.584 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 2.591 INCHES BOTH ENDS IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL COMP 4340 OVERALL |
| Face Nominal Width | 4.800 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 |
|---|---|
| 5210198 PRIMARY | Naval Sea Systems Command (USA) |
NSN 3020-01-251-5885 is a Gear,helical, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-251-5885 has 1 manufacturer part number on file: 5210198 (Naval Sea Systems Command).
Key specifications for 5210198: Keyway Nominal Width: 1.001 INCHES BOTH ENDS IN; Bore Nominal Diameter: 4.251 INCHES BOTH ENDS IN; Helix Angle: 17.9960 DEGREES; Hub Nominal Diameter: 6.300 INCHES BOTH ENDS IN. 21 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.