Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers refined performance and exceptional tuning stability. Built with a precise 1:18 gear ratio, it ensures velvet-smooth and exact tuning adjustments for demanding musicians.
Featuring high-precision CNC-machined components and premium brass string posts, this closed tuning machine offers robust, wear-free operation. Every unit is permanently lubricated with Schaller special grease, making it entirely maintenance-free over its lifetime.
Equipped with an innovative stepped collar washer, the M6 90 self-centers reliably without requiring stepped headstock peg holes. This design eliminates tilting torque and takes stress off both the post and mounting screws for rock-solid reliability.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Weight | 0.13 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 hollow screw |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Post Material | Brass |
| Lubrication | Permanently lubricated with Schaller special grease |




















