Schaller GrandTune Single Guitar Tuning Machine

The Schaller GrandTune Single Guitar Tuning Machine delivers the ultimate fusion of classic vintage aesthetics and state-of-the-art precision engineering. Featuring an open-gear design with a worm gear mechanism, it provides an ultra-precise 1:18 gear ratio for smooth, accurate, and stable tuning across any acoustic or electric instrument.
Built with non-synthetic coated contact surfaces and ultra-precise friction fittings, this tuning machine ensures zero wear, aging, or play over time. Its permanent, sealed screw joints offer maintenance-free operation while standard production dimensions allow effortless installation or retrofitting on various headstock types.
Engineered for optimal acoustic resonance, recessed screw holes provide firm seating and maximum vibration transfer into the instrument. Solid headstock configurations include a matching hexagonal press-in bushing and mounting screws for a complete, reliable installation.
Brand
Schaller
Model
GrandTune Single (GT-Single)
Model Number
GT-Single
Product Type
Single Guitar Tuning Machine
Gear Ratio
1:18
Design
Open Gear
Weight per Single Tuner
0.04 lb (Koa), 0.04 lb (Perloid), 0.04 lb (Galalith, Ebony), 0.05 lb (Snakewood), 0.06 lb (Butterbean) including bushing
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 Screws
2 x M2.2 x 11 mm (0.43 in) countersunk screws per tuner
Bushing Outer Diameter
0.35 in (Hexagonal Press-In)
Bushing Inner Diameter
0.24 in
Compatibility
Solid and slotted headstocks, acoustic and electric guitars