Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 guitar tuning machine represents precision engineering with an advanced 1:18 gear ratio, delivering ultra-smooth, fine-tuned response and rock-solid tuning stability. Built with CNC-machined components and self-locking drive technology, each enclosed unit provides balanced, sensitive action designed for high-performance instruments.
Crafted with premium brass string posts fitted directly into the housing, this tuning machine prevents mechanical wear while optimizing string tension transfer. The specialized stepped collar design seats securely into standard headstock bores without requiring stepped drilling, actively absorbing lateral pressure and preventing tilt on mounting screws.
Permanently lubricated with specialized grease, the sealed housing ensures maintenance-free operation across decades of active playing. Standardized mounting dimensions match classic predecessor models directly, making this tuner a seamless drop-in upgrade for acoustic and electric guitars.
Brand
Schaller
Product Type
Guitar Tuning Machine
Series
M6 Series
Model
M6 90
Gear Ratio
1:18
Post Material
Brass
Button Bore Hole
Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat
Weight per Single Tuner with Button (Small / Large)
Metal: 1.27 oz / 1.34 oz (36 g / 38 g); Perloid: 1.06 oz / 1.09 oz (30 g / 31 g); Ebony: 1.06 oz / 1.09 oz (30 g / 31 g) including banjonut
Product Weight
0.79 lb
Housing Type
Enclosed / Sealed
Lubrication
Schaller Special Grease (Permanently Lubricated)