The Gear,helical, cataloged under National Stock Number 3020-00-752-1686, 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 20 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-752-1686 |
| Primary Part Number | 7521686 |
| 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 | 6.1255 INCHES BOTH ENDS IN |
| Helix Angle | 23.7587 DEGREES |
| Teeth Quantity | 33 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 8 PLAIN AXIALLY THROUGH BODY FIRST END |
| Mounting Hole Nominal Diameter | 0.565 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS, RECESSED BODY |
| Pitch Diameter | 9.9000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 10.235 INCHES IN |
| Pressure Angle | 18.4240 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 7.125 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.500 INCHES SECOND END IN |
| Body Recess Nominal Depth | 0.500 INCHES FIRST END IN |
| Face Nominal Width | 2.000 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 |
|---|---|
| 7521686 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 3892B1120 | 5/9 Secondary reference Kaitlin Corp |
| 801E561 | 5/9 Secondary reference Kersey / American Lafrance a Div of Figgie International Inc |
| 3892B1120 | 3/9 Design control — primary reference Meritor Heavy Vehicle Systems, Llc |
| 3020007521686 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
| 2520007521686 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 3020-00-752-1686 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 3020-00-752-1686 has 1 manufacturer part number on file: 7521686 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7521686: Bore Nominal Diameter: 6.1255 INCHES BOTH ENDS IN; Helix Angle: 23.7587 DEGREES; Teeth Quantity: 33; Body Style: WEBBED, SOLID. 20 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.