The Gear,helical, cataloged under National Stock Number 3020-01-414-7957, 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-414-7957 |
| Primary Part Number | 845-6556528 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.540 INCHES BOTH ENDS IN |
| Helix Angle | 14.9166 DEGREES |
| Teeth Quantity | 24 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | PLAIN BOTH ENDS |
| Precision Classification | ACCURACY GRADE 8 |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS, RECESSED BODY |
| Material Document and Classification | ASTM A304 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.4906 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Nominal Outside Diameter | 2.693 INCHES IN |
| Surface Treatment | CARBON OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4130H OVERALL |
| Body Recess Nominal Depth | 0.462 INCHES BOTH ENDS IN |
| Face Nominal Width | 1.517 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 |
|---|---|
| 845-6556528 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6556528 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-414-7957 is a Gear,helical, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-414-7957 has 1 manufacturer part number on file: 845-6556528 (Naval Sea Systems Command).
Key specifications for 845-6556528: Bore Nominal Diameter: 1.540 INCHES BOTH ENDS IN; Helix Angle: 14.9166 DEGREES; Teeth Quantity: 24; Body Style: PLAIN, SOLID. 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.