Schaller M6 90 Guitar Tuning Machine

The Schaller M6 90 guitar tuning machine represents high-precision instrument hardware engineered with an upgraded 1:18 gear ratio for smooth, accurate, and stable tuning. Originally setting the global standard for closed tuning machines in 1966, this updated model incorporates modern CNC manufacturing and premium surface finishing.
Crafted with high-grade brass posts precision-fitted into the housing, the M6 90 ensures maximum tuning stability and wear-free operation. Every sealed unit is permanently lubricated with Schaller special grease, rendering the assembly completely maintenance-free across its lifetime.
Featuring the innovative stepped M6 flanged washer, it reliably centers the string post via the banjo bolt while preventing tilt and relieving mechanical pressure. The unit matches the exact installation dimensions of legacy models for direct drop-in replacement without instrument modification.
Brand
Schaller
Product Type
Guitar Tuning Machine
Model
M6 90
Gear Ratio
1:18
Post Material
Brass
Button Bore Hole
Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat
Unit Weight with Button
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)
Product Weight
0.79 lb