Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers outstanding precision and tuning comfort with its refined 1:18 gear ratio. Continuing the legacy of the original 1966 closed-housing design, each component is CNC-machined to exacting tolerances and permanently lubricated with Schaller special grease for maintenance-free operation.
Equipped with high-grade brass string posts engineered for wear-free durability, this tuning machine provides rock-solid tuning stability. The self-locking internal drive mechanism maintains velvety smooth adjustments under tension while eliminating unwanted backlash.
Installation is simplified through the stepped M6 collar washer measuring 0.39 in (10 mm), which reliably centers the post without requiring stepped headstock drilling. This innovative stepped collar design absorbs tilt momentum and reduces mechanical stress on both the string post and rear mounting screws.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Post Material | High-Grade Brass |
| Button Borehole Diameter | 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive surface |
| Weight per Single Tuner with Button (Small/Large) | Metal: 1.27 oz / 1.34 oz (36 g / 38 g); Perloid: 1.06 oz / 1.09 oz (30 g / 31 g); Ebony: 1.06 oz / 1.09 oz (30 g / 31 g) including hollow screw |
| Product Weight | 0.79 lb |
| Collar Washer Diameter | 0.39 in (10 mm) |
| Mounting Screw Size | M2.2 x 9.5 mm (0.37 in) |
| Lubrication | Schaller Special Grease, Sealed & Maintenance-Free |
