The Gear,helical, cataloged under National Stock Number 3020-00-513-9652, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-513-9652 |
| Primary Part Number | 7974247 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Keyway Nominal Width | 0.497 INCHES BOTH ENDS0.497 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 2.500 INCHES BOTH ENDS2.500 INCHES BOTH ENDS IN |
| Helix Angle | 20.1194 DEGREES20.1194 DEGREES |
| Hub Nominal Diameter | 3.410 INCHES BOTH ENDS3.410 INCHES BOTH ENDS IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.313 INCHES SECOND END0.313 INCHES SECOND END IN |
| Teeth Quantity | 3030 |
| Body Style | WEBBED, OFFSET, SOLIDWEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHTRIGHT |
| Bore Style | W/ KEYWAY BOTH ENDSW/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.938 INCHES BOTH ENDS0.938 INCHES BOTH ENDS IN |
| Teeth Type | SINGLE HELIXSINGLE HELIX |
| Hardness Rating | 60.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM OVERALL63.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | ONE PROTRUDING HUB, ONE RECESSED HUBONE PROTRUDING HUB, ONE RECESSED HUB |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALLMIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.9231 INCHES NOMINAL6.9231 INCHES NOMINAL IN |
| Tooth Form | STUBSTUB |
| Hub Style Designator | PLAIN BOTH ENDSPLAIN BOTH ENDS |
| Nominal Outside Diameter | 7.211 INCHES7.211 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.427 INCHES BOTH ENDS1.427 INCHES BOTH ENDS IN |
| Pressure Angle | 22.5000 DEGREES22.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 2.000 INCHES2.000 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 |
|---|---|
| 7974247 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 747KB2109 | 5/9 Secondary reference Mack Trucks Inc Parts Opn |
NSN 3020-00-513-9652 is a Gear,helical, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-513-9652 has 1 manufacturer part number on file: 7974247 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7974247: Keyway Nominal Width: 0.497 INCHES BOTH ENDS0.497 INCHES BOTH ENDS IN; Bore Nominal Diameter: 2.500 INCHES BOTH ENDS2.500 INCHES BOTH ENDS IN; Helix Angle: 20.1194 DEGREES20.1194 DEGREES; Hub Nominal Diameter: 3.410 INCHES BOTH ENDS3.410 INCHES BOTH ENDS IN. 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.