Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 tuning machine sets an industry benchmark for closed tuners, featuring an upgraded 1:18 gear ratio for velvet-smooth operation and precise tuning accuracy. All components are CNC-machined to exact tolerances and surface-finished, while the self-locking drive ensures consistent, delicate, and stable tuning performance.
Crafted with premium brass string posts that fit snugly into the housing, these tuners deliver exceptional tuning stability and wear-free longevity. The closed design features permanent lubrication with Schaller specialized grease, rendering the entire mechanical assembly completely maintenance-free.
Installation is simplified through the innovative stepped M6 flanged washer, which centers the string post via the hollow screw and eliminates the need for stepped headstock holes. This design prevents tilting moments and relieves mechanical pressure from both the post and the rear mounting screw.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Model | M6 90 |
| Gear Ratio | 1:18 |
| String Post Material | Brass |
| Product Weight | 0.79 lb |
| 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 hollow screw |
| Button Hole Diameter | 0.17 in (4.2 mm) with driving flat 0.14 in (3.6 mm) |
| Lubrication | Permanent Special Grease Lubrication |
