Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 sets a high standard for closed tuning machines, featuring a precise 1:18 gear ratio that delivers velvet-smooth tuning and exceptional pitch accuracy. All structural components are CNC-machined to exacting tolerances and treated with high-grade surface finishes to ensure seamless, self-locking operation.
Crafted with premium brass string posts, these tuners fit securely within the housing to maximize tuning stability and minimize mechanical wear. The integrated step washer reliably centers the string post through the banjo bolt without requiring stepped headstock drilling, effectively eliminating tilt and relieving stress on mounting screws.
Permanently lubricated with Schaller special grease for maintenance-free longevity, the M6 90 shares the exact mounting dimensions of its predecessor for direct replacement without instrument modifications.
| Gear Ratio | 1:18 |
| Brand | Schaller |
| Series | M6 Series |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| String Post Material | High-Grade Brass |
| Weight per Unit (Small/Large Button) | Metal (1.27 oz / 1.34 oz), Pearloid (1.06 oz / 1.09 oz), Ebony (1.06 oz / 1.09 oz) |
| Button Borehole | Diameter 0.17 in (4.2 mm) with driving flat 0.14 in (3.6 mm) |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
