The Gear,helical, cataloged under National Stock Number 3020-00-752-1015, 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 21 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-752-1015 |
| Primary Part Number | 7521015 |
| 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 |
| Bore Nominal Diameter | 2.126 INCHES FIRST END IN |
| Helix Angle | 28.2777 DEGREES |
| Hub Nominal Diameter | 3.323 INCHES FIRST END IN |
| Teeth Quantity | 28 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 2.760 INCHES FIRST END IN |
| Tooth Direction | LEFT |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.834 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 54.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MINIMUM OVERALL |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.9334 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 4.241 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8620H OVERALL |
| Counterbore Nominal Depth | 0.547 INCHES FIRST END IN |
| Face Nominal Width | 1.025 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 |
|---|---|
| 7521015 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| DU2343 | 5/9 Secondary reference U.S. Government activity |
| 2343T2 | 5/9 Secondary reference Diamond Reo Truck Co |
| 30-8-41 | 3/2 Design control — primary reference U.S. Government activity |
| 2343T2 | 5/9 Secondary reference Spalla Inc |
| 914099 | 5/9 Secondary reference Sasco Inc Canadian Div |
NSN 3020-00-752-1015 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 3020-00-752-1015 has 1 manufacturer part number on file: 7521015 (U S Army Tank Automotive Command Amsta-Im-Mm).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-123-0170, 5999-01-161-3540, 5930-01-458-6927. Verify interchangeability with system specifications before substitution.
Key specifications for 7521015: Bore Nominal Diameter: 2.126 INCHES FIRST END IN; Helix Angle: 28.2777 DEGREES; Hub Nominal Diameter: 3.323 INCHES FIRST END IN; Teeth Quantity: 28. 21 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.