Tuning Machines

The Mid-Size series is made with the same quality as the other Rotomatic® models. Slightly larger than the Mini Rotomatics®, the mid size series features an 18:1 gear ratio for smoother, more precise tuning. This compact machine head is perfect for use on smaller and in-line headpieces.

The same innovative engineering and classic design as the Original Locking Rotomatics®, but with smaller buttons for those who prefer a little more space for their fingers. Gear ratio is 18:1.
Contains 3 treble and 3 bass

A smaller version of the regular size ROTO-GRIP® lockers for the in line and smaller headstocks or for those who prefer a lighter feel.

Totally professional in design and performance. Small and lightweight, this precision machine fits guitar headpieces that will not take full size machines. The mini buttons provide more space for players' fingers (even larger fingers) to tune strings. Gear ratio is 14:1. Sealed-in lubrication keeps Mini-Rotomatics perfect for a lifetime! Includes ⅝" washers, bushings and wood screws.

The introduction of the new Grover Locking Rotomatics® gives you the ease of use provided by a standard tuner and the positive locking of our internal cam post. Simply insert the string through the string hole, pull to tension by hand and begin tuning. As you start to tune, only the locking cam in the string post turns. Once the string is locked, the string post begins to turn allowing you to bring the string to pitch. In less than one revolution of the string post, you will be in tune, to stay in tune. Gear ratio is 18 to 1.

The newest addition to the Grover family, these locking machine heads utilize the famous 18:1 Rotomatic® design with a “thumb screw” mechanism which locks the string into place. Insert the string through the post hole, wrap around once, then lock by tightening with the thumb screw. Perfect replacement for the most standard machine heads. Includes all mounting hardware. Includes 3 treble and 3 bass.

The 102V series is a remake (replica) of the original “Milk Bottle" style Rotomatics® first introduced by Grover. With an 18:1 gear ratio, this unique style will make any vintage guitar appear truly original. Package of 6, 3 per side.

These guitar machines are a triumph in engineering and styling. The housing provides a maximum bearing for worm, gear and string post. Gear ratio is 14:1. Worm and gear are precision-cut for perfect meshing. This eliminates backlash and slippage. Countersunk tension screw permits player to regulate turning tension to any degree. Gear box has a special lubricant for lifetime, trouble-free service. Includes 5/8” washers, bushings and wood screws.

These guitar machines are a triumph in engineering and styling. The housing provides a maximum bearing for worm, gear and string post. Gear ratio is 14:1. Worm and gear are precision-cut for perfect meshing. This eliminates backlash and slippage. Countersunk tension screw permits player to regulate turning tension to any degree. Gear box has a special lubricant for lifetime, trouble-free service. Includes ⅝" washers, bushings and wood screws.

The original Rotomatic® with an improved higher ratio gearing. The 18:1 ratio provides for finer tuning and greater stability. The finer gears provide smoother tuning and a higher degree of backlash elimination. This new version of the Rotomatic® uses the exact housing as the original. Only the gearing has changed. Includes washers, bushing and wood screws.

The Super Rotomatic® has a 14:1 gear ratio. The 3 step button gives this machine a distinctive look and the sealed-in lubrication assures smooth gear-and-worm movement for the life of the machine.