Grover Super Rotomatics Machineheads ~ 3+3 ~ Black Chrome

SKU: 109BC


3 treble and 3 bass, set of 6.

The 109 Series 3-step button gives these machine heads a distinctive look and sets them apart from other Rotomatics®. 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. eliminating backlash and slippage. Countersunk tension screw permits player to regulate turning tension to any degree. Enclosed gear box with special lubricant for a lifetime of trouble-free service.

Sealed-in, lubricated gears
14:1 gear ratio
25/64” post hole
Post length to hole: 23mm
Overall post length: 28.2mm
Weight per pc/per set: 1.6oz/9.6oz
Max. string gauge: .074”
Hardware included (bushings, washers, screws)

Drop-in replacement for:
• 102-18 Series
• 102V Series
• 103 Series
• 106 Series
• 109-18 Series
• 135 Series (Top mounting hole will be visible)
• 136 Series (Top mounting hole will be visible)
• 502 Series
• 509 Series


For detailed specifications and/or fitting guides please locate this item on the Grover website where they offer more information.

About Grover

Grover, who produce the World’s finest machine heads has a history which goes back to the very beginnings of the modern guitar as we know it. In the 1800’s American inventor and musician Albert Dean Grover, an innovator who earned over fifty patents for musical instrument parts began a legacy which has flourished over more than two centuries.
Innovation and excellence have continued with the development throughout the mid-20th century of the timeless Grover 102 and 205 Rotomatic tuner, with kidney bean or keystone buttons, the 135 Vintage, the iconic 105C Imperials,  and the elegant Roto-grip locking tuners. Covering the entire gamut of fretted musical instruments, Grover offers an almost limitless selection of tuners, for guitar, bass and banjo, plus bridges and capos.

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