Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 represents the evolution of the legendary original sealed tuning machine that set global industry standards. Engineered with a 1:18 gear ratio, it provides velvety smooth tuning action, precise micro-adjustments, and exceptional tuning stability. All components are precision CNC-machined, surface-finished, and permanently lubricated with Schaller special grease for maintenance-free operation.
Equipped with an innovative stepped flanged washer, this tuning machine simplifies installation while ensuring continuous centering of the string post. The stepped design eliminates tipping torque and takes direct mechanical pressure off both the post and the rear mounting screw, removing the need for stepped headstock drilling.
Featuring high-grade brass string posts precisely fitted into durable housings, the M6 90 matches the exact installation dimensions of its predecessor for direct, drop-in replacement without instrument modifications.
Brand
Schaller
Model
M6 90
Series
M6 Series
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Post Material
High-Grade Brass
Flanged Washer Diameter
0.39 in
Button Borehole
Diameter 0.17 in with 0.14 in drive flat
Mounting Screws
M2, 2 x 9.5
Single Tuner Weight 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
Product Weight
0.79 lb