Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers outstanding precision and smooth tuning comfort with an improved 1:18 gear ratio. CNC-machined components and surface finishes ensure sensitive, velvety-smooth, and reliable operation across diverse headstock configurations.
Crafted with premium brass string posts precision-fitted into the sealed housing, this tuner maximizes tuning stability and long-term wear resistance. The specialized Schaller permanent lubrication ensures completely maintenance-free functionality.
Featuring the innovative stepped M6 flanged washer, it eliminates the need for stepped headstock drilling while securely centering the string post. It maintains the identical installation dimensions of its predecessor for hassle-free direct replacement.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Product Weight | 0.13 lb |
| Weight with Button per Single Tuner (Small/Large) | Metal (0.08 lb / 0.08 lb), Perloid (0.07 lb / 0.07 lb), Ebony (0.07 lb / 0.07 lb) including banjo bolt |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with drive flat 0.14 in (3.6 mm) |
| String Post Material | Brass |
| SKU | 10050571.03.35 |


















