The Gear,helical, cataloged under National Stock Number 3020-00-245-8307, 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 25 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-245-8307 |
| Primary Part Number | 3248986 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.377 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 3.000 INCHES BOTH ENDS IN |
| Helix Angle | 14.9167 DEGREES |
| Hub Nominal Diameter | 4.500 INCHES BOTH ENDS IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.250 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 | 10.0 ROCKWELL C MINIMUM AND 20.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | RECESSED HUBS |
| Material Document and Classification | MIL-S-890,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 16.4000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Mounting Hole Nominal Thread Size | 0.500 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Nominal Outside Diameter | 16.683 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.696 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) TRANSVERSELY THROUGH HUB FIRST END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 3.000 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 |
|---|---|
| 3248986 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3248986 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 3248986 | 5/9 Secondary reference Swanson Diesel Inc |
NSN 3020-00-245-8307 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-245-8307 has 1 manufacturer part number on file: 3248986 (Hatch & Kirk, Inc.).
Key specifications for 3248986: Keyway Nominal Width: 0.377 INCHES BOTH ENDS IN; Bore Nominal Diameter: 3.000 INCHES BOTH ENDS IN; Helix Angle: 14.9167 DEGREES; Hub Nominal Diameter: 4.500 INCHES BOTH ENDS IN. 25 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.