Schaller M6 135 Guitar Tuning Machine
The Schaller M6 135 guitar tuning machine delivers outstanding precision and tuning comfort with an upgraded 1:18 gear ratio. Designed with high-precision CNC-machined brass string posts and permanently lubricated sealed housing, it provides smooth, sensitive, and wear-free operation.
Featuring the innovative stepped M6 flanged washer, this tuning machine simplifies installation by reliably centering the string post without requiring a stepped headstock bore. This mechanism eliminates tilting torque and reduces strain on both the post and rear mounting screws.
With identical installation dimensions to its classic predecessor, the M6 135 serves as a direct drop-in replacement that requires no modifications to your guitar headstock.
| Brand | Schaller |
| Model | M6 135 |
| Gear Ratio | 1:18 |
| Post Material | Brass |
| Weight per Single Tuner 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 banjo bolt |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with driving surface 0.14 in (3.6 mm) |
| Total Weight | 0.79 lb |
| Lubrication | Permanent Special Grease (Maintenance-Free) |
| Washer Type | Stepped M6 Flanged Washer (0.39 in / 10 mm diameter step) |




















