The Gear,helical, cataloged under National Stock Number 3020-00-333-3530, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-333-3530 |
| Primary Part Number | 7971915 |
| 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 FIRST END IN |
| Bore Nominal Diameter | 2.4995 INCHES FIRST END IN |
| Helix Angle | 20.1555 DEGREES |
| Hub Nominal Diameter | 3.410 INCHES FIRST END IN |
| Teeth Quantity | 33 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.191 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 60.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.7647 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 7.9875 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.427 INCHES FIRST END IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 2.438 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 |
|---|---|
| 7971915 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 747KB2108 | 5/9 Secondary reference Mack Trucks Inc Parts Opn |
NSN 3020-00-333-3530 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 3020-00-333-3530 has 1 manufacturer part number on file: 7971915 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7971915: Keyway Nominal Width: 0.497 INCHES FIRST END IN; Bore Nominal Diameter: 2.4995 INCHES FIRST END IN; Helix Angle: 20.1555 DEGREES; Hub Nominal Diameter: 3.410 INCHES FIRST END IN. 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.