The Gear,helical, cataloged under National Stock Number 3020-00-528-7120, 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-528-7120 |
| Primary Part Number | 3237902 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.7485 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 9.0615 INCHES BOTH ENDS IN |
| Helix Angle | 27.3217 DEGREES |
| Teeth Quantity | 54 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 89.0 ROCKWELL C MINIMUM AND 96.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | HUBLESS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 1035 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 10.8000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 11.084 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 4.7718 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 1035 OVERALL |
| Face Nominal Width | 1.4990 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 |
|---|---|
| 3237902 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3237902 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 3020-00-528-7120 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-528-7120 has 1 manufacturer part number on file: 3237902 (Hatch & Kirk, Inc.).
Key specifications for 3237902: Keyway Nominal Width: 0.7485 INCHES BOTH ENDS IN; Bore Nominal Diameter: 9.0615 INCHES BOTH ENDS IN; Helix Angle: 27.3217 DEGREES; Teeth Quantity: 54. 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.