The Gear,helical, cataloged under National Stock Number 3020-00-353-8261, 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 Hatch & Kirk, Inc.. Government technical data includes 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-353-8261 |
| Primary Part Number | 3239342 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.3475 INCHES FIRST END IN |
| Helix Angle | 14.9167 DEGREES |
| Teeth Quantity | 67 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.375 INCHES BOTH ENDS IN |
| First Step Nominal Length | 0.750 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 8.0 ROCKWELL C NOMINAL OVERALL |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 1035 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 13.4000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 6.500 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| End Nominal Length | 1.625 INCHES FIRST END IN |
| Nominal Outside Diameter | 13.6857 INCHES IN |
| End Nominal Diameter | 5.370 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 1035 OVERALL |
| Face Nominal Width | 2.500 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 |
|---|---|
| 3239342 PRIMARY | Hatch & Kirk, Inc. (USA) |
| 81125S41-20571PCA | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 3239342 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 81127S41-20571PCA | 5/9 Secondary reference U.S. Government activity |
NSN 3020-00-353-8261 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-353-8261 has 2 manufacturer part numbers on file: 3239342 (Hatch & Kirk, Inc.), 81125S41-20571PCA (Naval Sea Systems Command).
Key specifications for 3239342: Bore Nominal Diameter: 3.3475 INCHES FIRST END IN; Helix Angle: 14.9167 DEGREES; Teeth Quantity: 67; Body Style: WEBBED, WITH LIGHTENING HOLES. 22 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.