Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents high-precision engineering with an advanced 1:18 gear ratio, delivering ultra-precise tuning accuracy and velvety-smooth operation. Drawing on the legendary legacy of the original 1966 closed-housing design, this updated iteration incorporates modern CNC-machined components and refined surface finishes for unparalleled performance.
Every string post is crafted from premium brass and precision-fitted into the housing to ensure optimal tuning stability, wear resistance, and reliable return-to-pitch. The innovative stepped M6 flanged washer with a 0.39 in diameter reliably centers the post through the banjo bolt, eliminating tilt torque and protecting headstocks without requiring stepped boreholes.
Permanently lubricated with specialized Schaller grease for maintenance-free longevity, the M6 90 maintains the exact mounting footprint of its predecessor for seamless retrofitting. It offers robust construction paired with smooth, self-locking drive mechanics suited for discerning musicians and custom instrument builds.
| Brand | Schaller |
| Model | M6 90 |
| Series | M6 Series |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Post Material | High-Grade Brass |
| Housing Type | Enclosed / Sealed |
| Lubrication | Permanent Special Grease (Maintenance-Free) |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Included Hardware | Banjo bolts, stepped flanged washers, M2.2 x 9.5 mm mounting screws |
| Weight | 0.79 lb |
