Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents precision engineering with an advanced 1:18 gear ratio, delivering unmatched tuning accuracy and velvety smooth operation. CNC-machined components and self-locking drive mechanics ensure precise, sensitive, and stable string adjustment under rigorous playing demands.
Crafted with high-grade brass string posts engineered seamlessly into the enclosed housing, these tuners maximize wear resistance and string stability. Each unit features permanent lubrication with Schaller special grease, rendering the internal mechanism completely maintenance-free over its operating life.
Equipped with an innovative stepped flanged washer with a 0.4 in (10 mm) diameter base, this tuning machine automatically centers the string post through the banjo bolt without requiring stepped headstock reaming. It retains the identical mounting footprint of its predecessor for seamless retrofitting on solid or slotted headstocks.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Post Material | Brass |
| Weight | 0.8 lb |
| Weight per Tuner (Small/Large Button) | Metal (1.3 oz / 1.3 oz), Perloid (1.1 oz / 1.1 oz), Ebony (1.1 oz / 1.1 oz) including threaded bush |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Lubrication | Permanently lubricated with Schaller special grease |
| Construction | Closed housing, CNC-machined |
