Schaller GrandTune Single Guitar Tuning Machine

The Schaller GrandTune Single Guitar Tuning Machine combines refined vintage aesthetics with precise tuning performance and ultra-smooth operation. Designed as a perfected open-gear tuning mechanism with a worm drive, it delivers consistent response and resonance across acoustic and electric instruments.
Featuring a precise 1:18 gear ratio, this tuning machine provides exceptional tuning accuracy and longevity. The construction avoids synthetic polymer coatings to ensure seamless acoustic coupling, wear-free interaction, and direct tone transfer throughout the life of the guitar.
Engineered to standard instrument dimensions for straightforward replacement or new builds, it includes permanently locked and sealed screw joints for zero-maintenance operation, alongside countersunk mounting screw holes that guarantee a secure fit.
Brand
Schaller
Model
GrandTune Single (GT-Single)
Gear Ratio
1:18
Product Weight
0.11 lb
Weight per Single Unit
0.63 oz (Koa), 0.67 oz (Perloid), 0.71 oz (Galalith, Ebony), 0.74 oz (Snakewood), 0.88 oz (Butterbean)
Button Dimensions (W x H x D)
0.8 x 0.54 x 0.41 in (Butterbean), 0.69 x 0.54 x 0.24 in (all other buttons)
Mounting Screw Size
M2.2 x 11 mm (0.43 in)
Hex Bushing Outer Diameter
0.35 in
Hex Bushing Inner Diameter
0.24 in
Design
Open Gear