Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents refined engineering and performance. Featuring a precise 1:18 gear ratio, it delivers ultra-smooth, accurate tuning and exceptional tuning stability. All components are CNC-machined and finished to exacting standards, powered by a self-locking drive mechanism for consistent response.
Crafted with high-grade brass string posts precisely fitted into closed housings, the M6 90 ensures wear-free operation. Every closed tuner is permanently lubricated with Schaller special grease, making it entirely maintenance-free over its lifespan.
Featuring the innovative stepped M6 flanged washer with a 0.39-inch (10 mm) base, the string post centers securely through the banjo bolt without requiring step-drilled headstock holes. This design eliminates tilting torque and relieves mechanical pressure from both the post and mounting screw, matching previous M6 installation dimensions for direct replacement.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Weight | 0.79 lb |
| Post Material | Brass |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
