Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 sets the benchmark for closed guitar tuning machines with a refined 1:18 gear ratio for exceptionally smooth and precise tuning. Engineered with high-precision CNC manufacturing and high-grade brass string posts, it ensures maximum tuning stability and wear-free performance.
Featuring the innovative stepped M6 flanged washer, this tuning machine simplifies installation by reliably centering the string post without requiring a stepped peghead bore. This design eliminates tilting moments and relieves pressure from both the post and mounting screws.
Each closed mechanism is permanently lubricated with Schaller special grease for completely maintenance-free operation. Built with identical installation dimensions to its predecessor, it serves as a direct, modification-free upgrade for modern and vintage instruments alike.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Model | M6 90 |
| Gear Ratio | 1:18 |
| Product Weight | 0.79 lb |
| Material | High-Grade Brass, Metal |
| Lubrication | Permanently lubricated with Schaller special grease |
| Weight per Single Tuner with Button (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 with 0.14 in driving surface |
| Washer Diameter | 0.39 in |
