Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents precision engineering with an advanced 1:18 gear ratio for smooth, accurate tuning stability. Building on the legendary closed-housing design established in 1966, this modern iteration incorporates state-of-the-art manufacturing to meet the highest demands of contemporary musicians.
Every component is CNC-machined to exacting tolerances, featuring precision brass posts matched precisely to the housing for wear-free operation and maximum durability. The self-locking drive mechanism provides consistent, sensitive response across all adjustments, while lifetime Schaller specialized lubrication ensures completely maintenance-free performance.
Installation is streamlined thanks to the stepped M6 collar washer with a 0.39 in (10 mm) base diameter, which centers the string post securely and eliminates the need for stepped headstock drilling. This design absorbs lateral tension and eliminates tilting forces on both the post and the rear mounting screw, maintaining identical installation dimensions to previous models for direct replacement without guitar modifications.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Housing Type | Closed / Sealed |
| String Post Material | Brass |
| Button Bore Diameter | 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Collar Washer Diameter | 0.39 in (10 mm) |
| Mounting Screw Size | M2.2 x 0.37 in (9.5 mm) |
| Single Unit Weight with Button | Metal: 1.27 oz / 1.34 oz (36 g / 38 g); Perloid / Ebony: 1.06 oz / 1.09 oz (30 g / 31 g) |
| Product Weight | 0.13 lb (0.06 kg) |
