The Schaller M6-135 Rear Locking Machines 6-in-Line – Nickel are premium locking guitar tuners engineered for guitarists who demand smooth performance, fast string changes, and dependable tuning stability.

Featuring Schaller’s proven rear locking system, each string is securely clamped from the back of the tuning post, significantly reducing string slippage and improving tuning consistency. The 6-in-line configuration is ideal for guitars with straight headstocks, while the classic nickel finish delivers a refined, vintage-inspired appearance.

Manufactured with Schaller’s renowned German precision engineering, the M6-135 tuners offer smooth tuning action, long-lasting durability, and professional reliability for studio work, live performance, and touring musicians.

With this tuner the string is locked in the shaft by a handy knurled nut located on the rear of the peghead, resulting in a low overall height. 6-in-line models with two different shaft lengths (staggered). Gear ratio 1:16.

Available in two housing versions:

1. Screw mount with 135° lug

2. Pin lock

• Schaller was the world’s first manufacturer who developed the locking tuner and had it patented more than 20 years ago!

• Works like a traditional machine head, but the string needn’t be “wound up” any more. Instead it is inserted into the cam hole with the clamp screw loosened, locked with the clamp screw and can then be tuned at once.

• This makes changing your strings a lot faster and easier.

• Only this patented locking system based on the ball socket principle prevents reliably from string notching and breakage.

• The string will not be wound onto the shaft any more. So it will stay in tune extremely well, perfect for non-locking tremolo systems.

• With all its benefits the Schaller locking tuner is THE benchmark in the guitar sector!

• Only this patented locking system based on the ball socket principle prevents reliably from string notching and breakage.

• The string will not be wound onto the shaft any more. So it will stay in tune extremely well, perfect for non-locking tremolo systems.

• With all its benefits the Schaller locking tuner is THE benchmark in the guitar sector!

KEY FEATURES 

• Brand: Schaller

• Model: M6-135

• Instrument: Electric Guitar

• Configuration: 6-in-Line Headstock Layout

• Mounting: Rear locking machine heads

• Finish: Nickel

• Locking System: Rear string locking mechanism

• Performance: Smooth, precise, and stable tuning

• Use Case: Fast string changes and professional use

• Manufacturing: Precision German engineering

• Set Includes: 6 guitar machine heads

FAQ SECTION 

What is a rear locking machine head?

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

Are these tuners suitable for 6-in-line headstocks?

Yes. These tuners are designed for guitars with a 6-in-line headstock configuration.

Does the nickel finish suit vintage-style guitars?

Yes. The nickel finish offers a classic look that complements vintage and modern guitars alike.

Are these tuners suitable for professional use?

Absolutely. Schaller M6-135 locking tuners are trusted by professional musicians worldwide.

Are these genuine Schaller machine heads?

Yes. All Schaller machine heads supplied by Angkor Music Shop Melbourne are 100% genuine.