Schaller GrandTune Guitar Tuning Machine
The Schaller GrandTune combines refined vintage styling with precise tuning response and ultra-smooth operation. Designed as an open-gear tuning machine with precision worm gear architecture, it delivers exceptional acoustic resonance without synthetic polymer coatings.
Featuring an 1:18 gear ratio, this tuner provides uncompromising tuning accuracy and durability. Permanently locked, sealed, and joined screw connections ensure completely wear-free and maintenance-free performance throughout its lifespan.
Engineered to standard instrument dimensions for effortless installation and replacement, each unit includes countersunk screw holes and specialized mounting hardware for maximum tone transfer and structural stability.
| Brand | Schaller |
| Model | GrandTune Einzelmechanik (GT-Single) |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Product Weight | 0.67 lb |
| Weight per Single Tuner | 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) | 0.80 x 0.54 x 0.41 in (Butterbean), 0.69 x 0.54 x 0.24 in (all other buttons) |
| Mounting Screws Included | 2 x countersunk mounting screws per unit (M2.2 x 0.43 in) |
| Bushings Included | 1 x hexagonal press-in bushing per tuner (outer diameter 0.35 in, inner diameter 0.24 in for 0.24 in post) |



















