Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 guitar tuning machine delivers precise tuning stability and smooth performance with an advanced 1:18 gear ratio. Designed to preserve the legendary heritage of the original 1966 M6 series, this enclosed tuner features CNC-machined components and a self-locking drive system for sensitive, backlash-free adjustment.
Crafted with premium brass string posts fitted directly into the housing, this tuner maximizes vibration transfer and resists mechanical wear over extended use. Internal mechanisms are permanently lubricated with Schaller special grease to ensure fully maintenance-free operation across various playing environments.
Featuring the innovative stepped M6 flanged washer with a 0.39 in diameter base, the tuner self-centers the string post through the banjobolt to eliminate tilting torque without requiring a stepped headstock bore. The unit retains identical mounting dimensions to predecessor models for straightforward direct-replacement installation.
Brand
Schaller
Model
M6 90
Product Type
Guitar Tuning Machine
Gear Ratio
1:18
Post Material
Brass
Single Tuner Weight with Button (Small/Large)
Metal (1.27 oz / 1.34 oz), Pearloid (1.06 oz / 1.09 oz), Ebony (1.06 oz / 1.09 oz) including banjobolt
Button Bore Hole
Diameter 0.17 in with 0.14 in driving surface
Flanged Washer Base Diameter
0.39 in
Mounting Screw Size
M2.2 x 0.37 in
Lubrication
Schaller Special Grease (Maintenance-Free)
Estimated Shipping Weight
0.13 lb