Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents high-precision engineering with an advanced 1:18 gear ratio, delivering smooth, accurate, and stable tuning performance. Built to the iconic closed-housing standard originally established in 1966, this updated design incorporates contemporary mechanical innovations while preserving flawless tuning stability.
Every component is precision CNC-machined and surface-finished, featuring high-grade brass string posts closely fitted to the housing for wear-free operation. The self-locking internal drive and permanent lubrication with proprietary Schaller grease ensure completely maintenance-free functionality over extended playing lifetimes.
Equipped with an innovative stepped M6 flanged washer featuring a 0.39-inch diameter base, the tuner self-centers reliably via the banjo bolt without requiring a stepped headstock bore. This architecture eliminates tilting moments and relieves mechanical strain from both the post and mounting screw, matching original M6 installation dimensions for direct retrofit capability.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Post Material | Brass |
| Button Bore Hole | 0.17 in (4.2 mm) diameter with 0.14 in (3.6 mm) drive flat |
| Mounting Type | 90-degree rear mounting tab with stepped washer |
| Weight per Single Tuner with Button (Small / Large) | Metal: 0.08 lb / 0.08 lb (36 g / 38 g), Perloid: 0.07 lb / 0.07 lb (30 g / 31 g), Ebony: 0.07 lb / 0.07 lb (30 g / 31 g) |
| Product Weight | 0.13 lb |
| Lubrication | Permanently lubricated with Schaller special grease |
