Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 sets the benchmark for enclosed guitar tuning machines, offering exceptional precision and smooth operation. Engineered with an upgraded 1:18 gear ratio, it ensures effortless and ultra-fine tuning stability for demanding players. Every component is CNC-machined to exact tolerances, featuring high-grade brass string posts precisely seated within the housing.
Equipped with Schaller's innovative stepped flanged washer, this machine head centers the post through the threaded bushing without requiring a stepped headstock bore. This design eliminates tilting torque and minimizes stress on both the string post and rear mounting screw. Sealed and permanently lubricated with Schaller special grease, the internal self-locking drive remains completely maintenance-free over years of use.
Designed with identical mounting dimensions to its historic predecessor, the M6 90 allows for direct, modification-free retrofitting. It comes complete with threaded hex bushings, stepped washers, and mounting screws for standard solid headstock installations.
| Brand | Schaller |
| Product Type | Guitar Tuning Machine |
| Series | M6 Series |
| Gear Ratio | 1:18 |
| String Post Material | High-Grade Brass |
| Housing Design | Closed / Sealed |
| Lubrication | Permanently lubricated with Schaller special grease |
| Button Bore Hole | Diameter 0.17 in (4.2 mm) with 0.14 in (3.6 mm) drive flat |
| Mounting Screw Size | M2.2 x 9.5 mm |
| Product Weight | 0.79 lb |
| Weight per Single Unit (Metal Button) | 1.27 oz - 1.34 oz (36 g - 38 g) |
| Weight per Single Unit (Perloid/Ebony Button) | 1.06 oz - 1.09 oz (30 g - 31 g) |
