Schaller GrandTune Single Guitar Tuning Machine

The Schaller GrandTune Single combines refined vintage styling with precise tuning accuracy and ultra-smooth operation. Engineered with an open gear and worm architecture, it delivers exceptional resonance across acoustic, classical, electric, and archtop guitars without synthetic polymer coatings.
Featuring a 1:18 gear ratio, this tuning machine provides meticulous control, long-term durability, and wear-free mechanical interaction. Its precision-engineered contact surfaces and permanently sealed screw joints ensure maintenance-free performance that preserves instrument tone and tuning stability.
Designed to fit standard production instrument dimensions, it includes countersunk screw holes for enhanced contact and optimal acoustic transfer. Optional Deluxe string roller configurations incorporate end-shaft ball bearings to eliminate friction and noise within classical headstock bores.
Brand
Schaller
Model
GrandTune Single (GT-Single)
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Weight
0.11 lb
Design
Open Gear
Mounting Hardware
Countersunk Screws (M2.2 x 0.43 in)
Hexagonal Bushing Outer Diameter
0.35 in
Hexagonal Bushing Inner Diameter
0.24 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