Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers outstanding precision and smooth tuning comfort with an optimized 1:18 gear ratio. As an evolution of the industry-standard closed tuning machine originally introduced in 1966, this model features high-precision CNC machining and high-grade brass string posts fitted seamlessly into the housing for maximum tuning stability and wear resistance.
Equipped with an innovative stepped M6 flanged washer, the system centers the string post securely via the banjo bolt without requiring a stepped headstock hole. This design eliminates tilting torque and reduces mechanical strain on both the string post and rear fixing screws, ensuring flawless long-term performance.
Permanently lubricated with Schaller special grease for maintenance-free operation, the M6 90 retains identical mounting dimensions to its predecessor for direct, drop-in replacement without instrument modifications.
| Brand | Schaller |
| Manufacturer | Schaller GmbH |
| Gear Ratio | 1:18 |
| Material | Brass, Steel |
| Weight | 0.8 lb |
| Weight per Single Tuner with Button (Small/Large) | Metal (1.27 oz / 1.34 oz), Perloid (1.06 oz / 1.09 oz), Ebony (1.06 oz / 1.09 oz) including banjo bolt |
| Button Bore Hole | Diameter 0.17 in with driving surface 0.14 in |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
