Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers exceptional tuning precision and stability with an optimized 1:18 gear ratio. Continuing the legacy of the original closed-housing design established in 1966, this updated edition incorporates precision-engineered CNC components and an internal self-locking drive for smooth and uniform adjustments.
Crafted with premium brass string posts fitted directly into the housing, each unit ensures high wear resistance and zero tilt. The innovative stepped flanged washer centers the post automatically through the banjo bolt, eliminating the need for a stepped peghead bore while distributing mechanical load evenly away from mounting screws.
Permanently lubricated with Schaller special grease for maintenance-free operation, the M6 90 retains the standard footprint of predecessor models for direct, hassle-free replacement on compatible headstocks.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Weight per Unit with Button (Small/Large) | Metal: 1.27 oz / 1.34 oz (36 g / 38 g); Perloid: 1.06 oz / 1.09 oz (30 g / 31 g); Ebony: 1.06 oz / 1.09 oz (30 g / 31 g) including hollow screw |
| Post Material | Brass |
| Weight | 0.79 lb |
