Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 tuning machine series sets a worldwide benchmark for enclosed guitar tuners, combining legendary heritage with refined German engineering. Built with a precise 1:18 gear ratio, it delivers velvety-smooth, highly accurate tuning and superior pitch stability for demanding players.
Every component is CNC-machined to exact tolerances and permanently lubricated with Schaller special grease for completely maintenance-free operation. High-grade brass string posts fit snugly into the housing to eliminate wear and ensure dependable, long-term performance.
Featuring the innovative stepped M6 flanged washer with a 0.39 in (10 mm) base diameter, this design self-centers the string post through the hollow screw without requiring stepped peghead drilling. It matches original M6 90 installation dimensions for seamless, direct-replacement upgrades.
| Brand | Schaller |
| Model | M6 90 |
| Product Type | Guitar Tuning Machine |
| Gear Ratio | 1:18 |
| String Post Material | Brass |
| Lubrication | Schaller Special Grease (Maintenance-Free) |
| Button Borehole | Diameter 0.17 in (4.2 mm) with driving flat 0.14 in (3.6 mm) |
| Weight | 0.79 lb |
| Flanged Washer Diameter | 0.39 in |
| Mounting Hardware | Included |
