Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine features a refined 1:18 gear ratio that ensures precise, velvety-smooth tuning and exceptional tuning stability. Built with CNC-machined components and high-grade brass posts precisely fitted into the housing, it provides wear-free, self-locking performance.
Equipped with Schaller's innovative stepped flanged washer, this tuning machine enables effortless installation and reliable axis centering through the banjo bolt without requiring a stepped peghead bore. This design eliminates tilting torque and relieves mechanical stress on both the string post and rear mounting screw.
Permanently lubricated with Schaller special grease for completely maintenance-free operation, the M6 90 maintains identical installation dimensions to its predecessor for direct replacement without guitar headstock modifications.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Series | M6 Series |
| Model | M6 90 |
| Gear Ratio | 1:18 |
| Post Material | Brass |
| 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 (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Mounting Screw Size | M2.2 x 9.5 mm |
| Lubrication | Permanently lubricated with Schaller special grease |
