Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents high-precision engineering with an upgraded 1:18 gear ratio for smooth, precise tuning control. CNC-machined components with self-locking drives ensure stable, wear-free performance across diverse playing conditions.
Crafted with premium brass string posts and permanently lubricated with Schaller special grease, these sealed tuners operate entirely maintenance-free while maintaining exceptional tuning stability.
Featuring the innovative stepped M6 flanged washer, this design centers the string post securely without requiring stepped headstock drilling, eliminating tilt torque and protecting structural integrity.
| Gear Ratio | 1:18 |
| Weight per Single Tuner 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) including hollow screw |
| Button Bore Hole | 0.17 in diameter with 0.14 in drive flat |
| Total Weight | 0.79 lb |
| Brand | Schaller |
| Series | M6 Series |
| Post Material | High-Grade Brass |
| Housing Type | Sealed |
| Lubrication | Schaller Special Grease (Maintenance-Free) |



















