Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 Guitar Tuning Machine sets an industry standard for precision and tuning comfort with its improved 1:18 gear ratio. Designed with closed housing and permanently lubricated with Schaller special grease, it delivers completely maintenance-free, velvety-smooth, and reliable tuning performance.
All components are CNC-machined to exact tolerances and surface-finished, featuring precision brass posts engineered to minimize wear and maximize tuning stability. The self-locking drive ensures consistent, sensitive string adjustment without slippage.
Featuring the innovative stepped M6 flanged washer, this machine head simplifies installation by centering the string post directly through the banjo bolt. This eliminates tilting torque, relieves stress on both the string axis and rear mounting screw, and fits identical dimensions of predecessor models for direct replacement.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Series | M6 Series |
| Gear Ratio | 1:18 |
| String Post Material | Brass |
| Product Weight | 0.8 lb |
| Single Unit Weight with Button (Small/Large) | Metal (1.3 oz / 1.3 oz), Perloid (1.1 oz / 1.1 oz), Ebony (1.1 oz / 1.1 oz) including hollow bolt |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
