Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents high precision and legendary reliability. Featuring an upgraded 1:18 gear ratio, it ensures velvet-smooth and exceptionally accurate tuning stability for modern instruments.
Every component is CNC-machined to exacting tolerances, featuring brass posts precision-fitted into the housing and self-locking drive gears. Sealed housings are permanently lubricated with Schaller special grease for completely maintenance-free operation.
Equipped with the innovative stepped M6 flanged washer with a 0.39 in (10 mm) base diameter, this tuning machine reliably centers the string post without requiring stepped peghead counterbores, effectively eliminating tilting torque and reducing post stress.
| Gear Ratio | 1:18 |
| Weight with Button per Single Tuner (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 (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Product Weight | 0.79 lb |
| Brand | Schaller |
| Model | M6 90 |
| Post Material | Brass |
| Lubrication | Maintenance-free grease lubrication |





















