The Schaller M6-90 Rear Locking Machines 3/3 – Chrome are professional-quality guitar tuning machines engineered for players who require fast string changes, precise tuning, and outstanding tuning stability.

Equipped with Schaller’s reliable rear locking mechanism, these tuners securely clamp the string from the back of the post, reducing slippage and enhancing tuning consistency. The 3/3 headstock configuration makes them suitable for a wide range of electric guitars, while the durable chrome finish offers a clean, classic look.

Built with Schaller’s renowned German precision engineering, the M6-90 locking tuners deliver smooth tuning action, long-term reliability, and dependable performance for stage, studio, and touring musicians.

Available from Angkor Music Shop Melbourne.

The original M6 set a new global standard for closed tuners in 1966. Since 2017, the M6 has offered numerous improvements and innovations without losing its unique aura.

Special features

• Their perfect functionality combined with an improved gear ratio of 1:18 ensures a precise and velvety smooth tuning process.
• All parts are CNC-machined with high precision, surface-finished and guarantee smooth, sensitive and stable tuning thanks to the self-locking drive. 
• We manufacture all posts from high-quality brass, they are precisely fitted into the housing and guarantee the highest possible tuning stability and freedom from wear. 
• The innovative M6 step-washer guarantees problem-free assembly and permanently solid centering of the post.
• All closed mechanisms are permanently lubricated with Schaller special grease and are therefore absolutely maintenance-free.

Advantages of the M6-step washers

This Schaller innovation facilitates the installation of the M6 machine head and provides additional protection for the perfect function and longevity of your tuning machine head. The additional step at the bottom of the M6 washer (with a diameter of 10 mm) reliably centers the string post via the threaded bushing and eliminates the need for a stepped hole in the headstock. This function eliminates the tilting moment and takes the pressure off both the post and the fixing screw on the back.

Note

1. The new M6 90 has the same installation dimension as its predecessor model and can therefore be replaced easily and without modifications!
2. In the configurator, you can choose between our two locking models: Locking (on the housing) or TopLocking (top of post).
3. Fitting the TopLocking model: Please unscrew the black, knurled TopLocking sleeve as far as it will go and then pull it off. Install the mechanism on the headstock, press the TopLocking sleeve back onto the post and screw tight.

Technical specifications

• Gear ratio: 1:18
• Weight each single tuner with button (small/large): Metal (36 g/38 g), Perloid (30 g/31 g), Ebony (30 g/31 g) including threaded bushing
• Drill hole button: diameter 4.2 mm with driving surface 3.6 mm

Scope of supply

• 6 x threaded bushings (for item selection "posts for solid headstock 14,65", these are not required and not included in scope of delivery)
• 6 x step washers
• 6 x mounting screws: M2.2 x 9.5
• Only the locking model (staggered) is supplied with 3 x 19.5 mm and 3 x 21.0 mm posts (see illustration in the configurator).

KEY FEATURES 

• Brand: Schaller

• Model: M6-90

• Instrument: Electric Guitar

• Configuration: 3/3 Headstock Layout

• Mounting: Rear locking tuning machines

• Finish: Chrome

• Locking System: Rear string locking for improved stability

• Performance: Smooth, precise, and stable tuning

• Use Case: Fast string changes and reliable tuning

• Manufacturing: Precision German engineering

• Set: Set of 6 guitar tuners

FAQ SECTION 

What is a rear locking tuner?

A rear locking tuner clamps the string from the back of the tuning post, reducing string slippage and improving tuning stability.

Are these tuners suitable for professional use?

Yes. Schaller M6-90 locking tuners are designed for professional musicians, touring artists, and studio applications.

Do locking tuners really improve tuning stability?

Yes. Locking tuners help prevent string movement, allowing the guitar to stay in tune longer.

Are these tuners easy to install?

They are designed as replacements for compatible guitars. Professional installation is recommended for best results.

Are these genuine Schaller tuning machines?

Yes. All Schaller tuning machines supplied by Angkor Music Shop Melbourne are 100% genuine.