Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers precise and smooth tuning performance with its refined 1:18 gear ratio. All components are CNC-machined to exact tolerances, premium surface-finished, and permanently lubricated with Schaller special grease for maintenance-free operation and exceptional durability.
Equipped with high-grade brass posts precision-fitted into the housing, this tuning machine provides maximum tuning stability and wear resistance. The self-locking drive ensures consistent, delicate, and stable tuning under all playing conditions.
Featuring the innovative stepped M6 flanged washer with a 0.39 in (10 mm) diameter base, it reliably centers the string post via the banjo bolt and eliminates the need for stepped headstock drilling. This design absorbs tension, prevents tilting, and directly replaces legacy M6 units without headstock modification.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Series | M6 Series |
| Model | M6 90 |
| Gear Ratio | 1:18 |
| Post Material | High-Grade Brass |
| Manufacturing | CNC-Machined |
| Lubrication | Permanent Special Grease Lubrication (Maintenance-Free) |
| Weight | 0.79 lb |
| Weight per Single Unit with Button | 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) |
| Button Borehole | Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Washer Type | Stepped M6 Flanged Washer |
