Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 tuning machine series sets a high standard for closed tuning systems, featuring an advanced 1:18 gear ratio that ensures precise, smooth, and stable tuning comfort. Engineered with precision CNC-machined components and surface finishes, the self-locking drive provides consistent, fine-tuned control and dependable performance.
Crafted with premium brass string posts precision-fitted directly into the housing, this tuning machine maximizes tuning stability and long-term wear resistance. The innovative stepped M6 flanged washer reliably centers the string post via the banjo bolt, eliminating tilting friction and protecting both the post and rear mounting screws without requiring stepped headstock drilling.
Featuring permanently lubricated internal gears with proprietary Schaller grease, each closed unit remains completely maintenance-free throughout its lifespan. With installation dimensions identical to previous iterations, it serves as a seamless replacement and upgrade for solid or slotted headstock instruments.
Brand
Schaller
Product Line
M6 Series
Model
M6 90
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Post Material
High-Grade Brass
Button Bore Hole
0.17 in (4.2 mm) diameter 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 hollow screw
Product Weight
0.79 lb
Lubrication
Schaller Special Grease (Permanently Lubricated)