Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 guitar tuning machine represents precision engineering with a refined 1:18 gear ratio, delivering ultra-smooth operation and superior tuning stability. Designed as the direct evolution of the original closed-housing tuner established in 1966, it features advanced innovations while maintaining complete compatibility with legacy mounting dimensions.
Every component is precision CNC-machined and surface-finished, featuring self-locking drives and durable brass string posts fitted tightly into the housing for maximum wear resistance. All enclosed mechanisms are permanently lubricated with Schaller specialized grease to remain completely maintenance-free across their service life.
Installation is simplified through the innovative stepped M6 flanged washer, which precisely centers the post via the banjo bolt and eliminates the need for stepped headstock holes. This design relieves tilting torque and pressure from both the string post and rear mounting screw to ensure long-term mechanical reliability.
Brand
Schaller
Model
M6 90
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Post Material
High-Grade Brass
Lubrication
Schaller Special Grease (Maintenance-Free)
Button Bore Hole
0.17 in (4.2 mm) diameter with 0.14 in (3.6 mm) driving surface
Flanged Washer Diameter
0.39 in (10 mm)
Mounting Screw Size
M2.2 x 9.5 mm (M2.2 x 0.37 in)
Single Tuner Weight 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)
Weight
0.8 lb