The Gear,helical, cataloged under National Stock Number 3020-00-245-8317, 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 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-245-8317 |
| Primary Part Number | 3213387 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.749 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 3.000 INCHES BOTH ENDS IN |
| Helix Angle | 14.9167 DEGREES |
| Hub Nominal Diameter | 4.500 INCHES SECOND END IN |
| Hub Nominal Diameter | 4.500 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.257 INCHES BOTH ENDS IN |
| Teeth Quantity | 82 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Mounting Hole Type and Quantity | 1 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 92.0 ROCKWELL B NOMINAL OVERALL |
| Style Designator | RECESSED HUBS |
| Material Document and Classification | MIL-S-890,ALLOY NO. 3 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 16.4000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN SECOND END |
| Hub Style Designator | 1 GROOVE FIRST END |
| Mounting Hole Nominal Thread Size | 0.500 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Nominal Outside Diameter | 16.6830 INCHES IN |
| Mounting Hole Thread Quantity Per Inch | 13 TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance From Bore Center to Keyway Bottom | 1.7135 INCHES BOTH ENDS IN |
| Nominal Distance From End to First Groove | 0.375 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| First Groove Nominal Diameter | 4.250 INCHES FIRST END IN |
| First Groove Nominal Width | 0.125 INCHES FIRST END IN |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) TRANSVERSELY THROUGH HUB FIRST END |
| 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 |
|---|---|
| 3213387 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3213387 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 3020-00-245-8317 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-245-8317 has 1 manufacturer part number on file: 3213387 (Hatch & Kirk, Inc.).
Key specifications for 3213387: Keyway Nominal Width: 0.749 INCHES BOTH ENDS IN; Bore Nominal Diameter: 3.000 INCHES BOTH ENDS IN; Helix Angle: 14.9167 DEGREES; Hub Nominal Diameter: 4.500 INCHES SECOND END IN. 29 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.