The Gear,helical, cataloged under National Stock Number 3020-00-506-8530, 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 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-506-8530 |
| Primary Part Number | 7974516 |
| 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 | 0.375 INCHES BOTH ENDS0.375 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.772 INCHES BOTH ENDS1.772 INCHES BOTH ENDS IN |
| Helix Angle | 20.0000 DEGREES20.0000 DEGREES |
| Hub Nominal Diameter | 2.250 INCHES FIRST END2.250 INCHES FIRST END IN |
| Teeth Quantity | 2121 |
| Body Style | PLAIN, SOLIDPLAIN, SOLID |
| Tooth Direction | RIGHTRIGHT |
| Bore Style | W/ KEYWAY BOTH ENDSW/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.312 INCHES FIRST END0.312 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIXSINGLE HELIX |
| Hardness Rating | 56.0 ROCKWELL C MINIMUM AND 56.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL60.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUBPROTRUDING HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 8620H ASSN STD SINGLE MATERIAL RESPONSE OVERALLAISI/SAE 8620H ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.2000 INCHES NOMINAL4.2000 INCHES NOMINAL IN |
| Tooth Form | STUBSTUB |
| Hub Style Designator | PLAIN FIRST ENDPLAIN FIRST END |
| Nominal Outside Diameter | 4.481 INCHES4.481 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.076 INCHES BOTH ENDS1.076 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES20.0000 DEGREES |
| Material | STEEL COMP 8620H OVERALL |
| Face Nominal Width | 1.000 INCHES1.000 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 |
NSN 3020-00-506-8530 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 3020-00-506-8530 has 2 manufacturer part numbers on file: 7974516 (U S Army Tank Automotive Command Amsta-Im-Mm), 7Y1460 (Garwood/feller Inc Garwood Winch Div).
Key specifications for 7974516: Keyway Nominal Width: 0.375 INCHES BOTH ENDS0.375 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.772 INCHES BOTH ENDS1.772 INCHES BOTH ENDS IN; Helix Angle: 20.0000 DEGREES20.0000 DEGREES; Hub Nominal Diameter: 2.250 INCHES FIRST END2.250 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.