Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine represents high-precision engineering with an advanced 1:18 gear ratio, delivering ultra-precise, velvety-smooth tuning comfort and rock-solid stability. Based on the legendary closed tuner standard established in 1966, this upgraded version features high-grade CNC-machined components and premium brass string posts engineered for maximum wear resistance.
Equipped with Schaller's innovative stepped flanged washer, this machine head self-centers the string post via the banjo bolt and eliminates the need for stepped headstock drilling. This design absorbs lateral tilt force and reduces mechanical stress on both the post and rear mounting screw, while factory-sealed Schaller special grease ensures completely maintenance-free operation.
Featuring identical installation dimensions to its predecessor for effortless drop-in replacement without instrument modification, this tuner provides smooth, sensitive, and backlash-free action with a self-locking drive mechanism suitable for standard and custom headstock configurations.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Series | M6 Series |
| Gear Ratio | 1:18 |
| Weight per Single Tuner | 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 0.14 in (3.6 mm) drive flat |
| String Post Material | High-Grade Brass |
| Mounting Hole Diameter | 0.39 in (10 mm) washer base |
| Lubrication | Schaller Special Grease, Permanent / Maintenance-Free |
| Mounting Screws Included | M2.2 x 9.5 mm |
