Schaller M6 90 Guitar Tuning Machine
The Schaller M6 90 guitar tuning machine delivers refined performance and tuning comfort with its precise 1:18 gear ratio. Continuing the legacy established by the original sealed design in 1966, this modern version incorporates premium CNC-machined components and high-grade brass string posts engineered for maximum tuning stability and long-lasting durability.
Featuring the innovative stepped M6 collar washer with a 0.39 in (10 mm) base diameter, this tuning machine reliably centers the string post without requiring stepped peghead drilling. This construction eliminates tilting moments and relieves mechanical pressure from both the post and rear mounting screws.
Permanently lubricated with Schaller special grease for maintenance-free operation, the M6 90 matches the standard installation dimensions of its predecessor for direct, modification-free retrofitting on compatible headstocks.
| Brand | Schaller |
| Series | M6 Series |
| Product Type | Guitar Tuning Machine |
| 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 0.14 in (3.6 mm) drive flat |
| Product Weight | 0.79 lb |
| Lubrication | Schaller special grease (maintenance-free) |
