Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 sets the benchmark for closed guitar tuning machines with an upgraded 1:18 gear ratio that delivers exceptional precision and velvet-smooth tuning stability. All components are CNC-machined to exact tolerances and surface-finished, featuring high-grade brass string posts engineered for maximum wear resistance and long-lasting performance.
Featuring the innovative stepped M6 flanged washer, this tuning machine ensures straightforward installation and durable centering of the string post via the hollow bolt. The stepped design eliminates tilting torque and absorbs physical strain from both the post and the rear mounting screw, removing the need for a stepped peghead bore.
Built to the identical mounting dimensions of its classic predecessor, the M6 90 serves as a seamless, modification-free upgrade or replacement. Each fully enclosed unit comes permanently lubricated with Schaller special grease for completely maintenance-free operation.
| Gear Ratio | 1:18 |
| 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 Borehole | Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Brand | Schaller |
| Series | M6 Series |
| String Post Material | Brass |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
| Mounting Compatibility | Direct replacement for original M6 90 |
