Schaller GrandTune Single Guitar Tuning Machine

The Schaller GrandTune combines refined vintage styling with ultra-precise tuning response and exceptionally smooth performance. Featuring an open-gear architecture with a worm screw mechanism, it operates with a 1:18 gear ratio for fine-tuned accuracy and lasting durability.
Crafted without synthetic polymer coatings, its ultra-precise contact surfaces provide optimal stick-slip performance while promoting natural instrument resonance. Permanently locked, sealed screw joints ensure wear-free, maintenance-free operation over extended playing life.
Engineered to standard instrument dimensions for straightforward replacement or installation, this tuning machine features countersunk mounting screw holes for firm coupling and optimal tone transfer.
Brand
Schaller
Model
GrandTune Single (GT-Single)
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Design
Open Gear
Weight per Unit
0.04 lb (Koa), 0.04 lb (Perloid), 0.04 lb (Galalith, Ebony), 0.05 lb (Snakewood), 0.06 lb (Butterbean)
Button Dimensions (W x H x D)
0.8 x 0.5 x 0.4 in (Butterbean), 0.7 x 0.5 x 0.2 in (all other buttons)
Bushing Outer Diameter
0.35 in
Bushing Inner Diameter
0.24 in
String Roller Deluxe Ball Bearing Diameter
0.39 in
String Roller Deluxe Post Diameter
0.39 in
Mounting Screws Included
2 x countersunk mounting screws (M2.2 x 11)
Bushings Included
1 x hexagonal press-in bushing (solid headstock models only)