Schaller GrandTune Single Guitar Tuning Machine

The Schaller GrandTune Single combines vintage open-gear aesthetics with modern engineering, delivering precise tuning stability and exceptionally smooth performance. Built with an open gear and worm architecture, it features an 1:18 gear ratio designed for exacting accuracy and long-lasting reliability without relying on synthetic coatings.
Ultra-precise fittings and contact surfaces provide stick-slip-free movement while preserving instrument resonance and preventing wear over time. The mechanism includes permanently locked and sealed screw connections for maintenance-free operation and countersunk screw holes that ensure firm mounting and acoustic coupling.
Engineered to standard instrument dimensions for straightforward installation and replacement, each tuning machine comes equipped with matching countersunk mounting screws and appropriate mounting hardware.
Brand
Schaller
Model
GrandTune Single (GT-Single)
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Design
Open Gear
Button Dimensions (Butterbean)
0.80 x 0.54 x 0.41 in
Button Dimensions (Standard)
0.69 x 0.54 x 0.24 in
Included Hardware
2 countersunk mounting screws (M2.2 x 11), 1 hexagonal press-in bushing (8.8 mm OD) for solid headstock versions