Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers refined tuning precision and smooth operation with its upgraded 1:18 gear ratio. Continuing the legacy of the original 1966 closed-housing design, this modern iteration incorporates advanced engineering to ensure superior pitch stability and effortless adjustment.
High-precision CNC-machined components and premium brass string posts are fitted securely inside a sealed housing to eliminate mechanical play and prevent wear. Each unit is permanently lubricated with Schaller special grease, providing completely maintenance-free performance and consistent torque over a lifetime of use.
Featuring the innovative stepped M6 flanged washer, this tuning machine reliably centers the string post without requiring a stepped headstock bore. This design eliminates tilting torque and reduces mechanical strain on both the post and rear mounting screws for a seamless retrofit installation.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Model | M6 90 |
| Gear Ratio | 1:18 |
| Post Material | Brass |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Single Tuner Weight 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) |
| Total Weight | 0.79 lb |
| Housing Type | Closed / Sealed |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
