Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 Guitar Tuning Machine delivers exceptional tuning precision and stability with an improved 1:18 gear ratio for smooth, accurate adjustments. CNC-machined components with refined surface finishes and a self-locking drive ensure velvet-smooth operation and reliable string tension.
Featuring high-grade brass string posts engineered for wear-free durability, this closed tuning machine includes the innovative stepped M6 flanged washer. This washer precisely centers the string post through the hollow screw, eliminating tilting torque and removing the need for a stepped headstock bore.
Designed to maintain identical installation dimensions to its predecessor, the M6 90 allows for seamless direct replacement without guitar modifications. Each sealed unit is permanently lubricated with Schaller special grease for maintenance-free longevity.
Brand
Schaller
Product Type
Guitar Tuning Machine
Series
M6 Series
Model
M6 90
Gear Ratio
1:18
Weight
0.79 lb
Single Tuner Weight 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 Bore Hole
Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm)
Post Material
Brass
Lubrication
Schaller Special Grease (Maintenance-Free)