Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers outstanding precision and smooth tuning with an advanced 1:18 gear ratio. As an evolution of the closed-housing tuning machine first established in 1966, this model combines classic reliability with modern engineering.
Precision CNC-machined components and surface finishes ensure smooth, sensitive, and stable operation via a self-locking drive. High-grade brass string posts are fitted into the housing to maximize tuning stability and provide wear-free performance, backed by permanent internal lubrication with special grease.
An innovative stepped collar design centers the post via the threaded bushing, eliminating tilting torque and protecting the mounting screws while doing away with the need for stepped headstock drilling. It shares identical mounting dimensions with its predecessor for straightforward replacement without modifications.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Post Material | High-Grade Brass |
| Manufacturing Process | CNC-Machined |
| Weight per Single Tuner with Button (Small/Large) | Metal (1.27 oz / 1.34 oz), Perloid (1.06 oz / 1.09 oz), Ebony (1.06 oz / 1.09 oz) including banjo bolt |
| Button Borehole | Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Lubrication | Permanent Special Grease, Maintenance-Free |
| Collar Type | M6 Stepped Collar (Diameter 0.39 in / 10 mm) |
| Mounting Screws | M2, 2 x 0.37 in (9.5 mm) |
