Schaller GrandTune Guitar Tuning Machine

The Schaller GrandTune combines refined vintage styling with modern precision engineering and smooth tuning response. Designed as an open-gear tuner with a precision worm drive, it features a 1:18 gear ratio that delivers exceptional accuracy and long-term durability. By omitting synthetic coatings, the tuner allows direct acoustic coupling to provide optimal resonance across the headstock.
Engineered for wear-free performance, the GrandTune utilizes high-precision contact surfaces and permanently locked, sealed screw joints that require no ongoing maintenance. The tuner is dimensioned to standard instrument specifications to ensure straightforward replacement and installation, while countersunk screw holes provide firm seating and optimal vibration transfer.
Solid headstock models include a hexagonal press-in bushing and mounting screws designed to maintain exact worm gear alignment. For slotted headstock instruments, direct installation requires no external bushings, making it a versatile tuning solution across classic and contemporary guitar builds.
Brand
Schaller
Model
GrandTune (GT-Single)
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Bushing Outer Diameter
0.35 in
Bushing Inner Diameter
0.24 in
Post Diameter Compatibility
0.24 in
Mounting Screws
2 x Countersunk Screws (M2.2 x 11 mm / 0.43 in)
Button Dimensions (Butterbean)
0.8 x 0.54 x 0.41 in
Button Dimensions (Standard)
0.69 x 0.54 x 0.24 in
Single Tuner Weight
0.63 oz (Koa), 0.67 oz (Perloid), 0.71 oz (Galalith, Ebony), 0.74 oz (Snakewood), 0.88 oz (Butterbean)