The Gear,spur, cataloged under National Stock Number 3020-00-718-8790, 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 Mack Trucks Inc Parts Opn. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-718-8790 |
| Primary Part Number | 788KC222 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Mack Trucks Inc Parts Opn |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.0060 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 4.0560 INCHES SECOND END IN |
| Teeth Quantity | 22 |
| Body Style | PLAIN, SOLID |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.2000 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 2.2300 INCHES FIRST END IN |
| First Step Nominal Length | 0.2000 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 4.2980 INCHES NOMINAL IN |
| Tooth Form | STUB |
| First Step Nominal Diameter | 4.0560 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 10 BOTH ENDS |
| End Nominal Length | 2.0300 INCHES FIRST END IN |
| Nominal Outside Diameter | 4.647 INCHES IN |
| End Nominal Diameter | 3.5000 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.8680 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 3020-00-718-8790 is a Gear,spur, manufactured by Mack Trucks Inc Parts Opn, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-718-8790 has 2 manufacturer part numbers on file: 7974246 (U S Army Tank Automotive Command Amsta-Im-Mm), 788KC222 (Mack Trucks Inc Parts Opn).
Key specifications for 788KC222: Bore Nominal Diameter: 3.0060 INCHES BOTH ENDS IN; Hub Nominal Diameter: 4.0560 INCHES SECOND END IN; Teeth Quantity: 22; Body Style: PLAIN, SOLID. 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.