Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers state-of-the-art precision and exceptional tuning comfort with an upgraded 1:18 gear ratio. All components are CNC-machined to exacting tolerances, surface-finished, and permanently lubricated with Schaller special grease for maintenance-free operation. High-grade brass string posts fit precisely into the housing to ensure maximum tuning stability and long-term wear resistance.
Featuring the innovative stepped M6 flanged washer with a 0.39-inch diameter base, this tuner reliably centers the string post via the banjo bolt without requiring a stepped peghead bore. This engineering solution eliminates tilting torque while relieving mechanical stress on both the post and the rear mounting screw. With identical installation dimensions to its predecessor, it serves as a seamless direct-replacement upgrade.
Built with self-locking drive mechanisms, the M6 90 provides ultra-smooth, sensitive, and stable string adjustment. The robust sealed design protects internal gears from dirt and corrosion across all playing conditions. Included mounting hardware ensures precise alignment and effortless installation on modern headstocks.
| Brand | Schaller |
| Model | M6 90 |
| Series | M6 Series |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| String Post Material | Brass |
| Housing Construction | Sealed, CNC-Machined |
| Lubrication | Permanently Lubricated with Schaller Special Grease |
| Flanged Washer | Stepped M6 Flanged Washer (0.39 in / 10 mm Diameter) |
| Button Bore Hole | 0.17 in (4.2 mm) Diameter with 0.14 in (3.6 mm) Drive Surface |
| Mounting Hardware | M2.2 x 9.5 mm Screws, Banjo Bolts, Stepped Washers Included |
| Weight | 0.79 lb (0.36 kg) |
