Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 guitar tuning machine represents precision engineering with a refined 1:18 gear ratio for smooth, velvety tuning and exceptional tuning stability. Built with CNC-machined components and a self-locking drive, it provides consistent and sensitive adjustment for demanding players. High-grade brass string posts fit precisely into the housing, ensuring long-term wear resistance and performance.
Equipped with Schaller's innovative stepped flanged washer, this machine head centers the string post securely via the banjo bolt and eliminates tilting torque without requiring stepped drilling in the headstock. All enclosed tuners are permanently lubricated with proprietary Schaller special grease, rendering them completely maintenance-free over their entire lifespan.
Featuring the exact installation dimensions of its classic predecessor, the M6 90 serves as a direct drop-in replacement without requiring guitar headstock modifications. It delivers robust mechanical reliability and professional tuning accuracy across a wide range of solid and slotted headstock configurations.
Brand
Schaller
Product Type
Guitar Tuning Machine
Model
M6 90
Gear Ratio
1:18
Weight
0.8 lb
Button Hole Diameter
0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive surface
Lubrication
Schaller Special Grease (Maintenance-Free)
Post Material
Brass