Graph Tech PRL-8731-C0 Ratio Locking Tuners

This right-handed set of ratio locking tuners is designed as a replacement or upgrade to any guitar featuring six-in-line tuners.

The PRL-8731 is a right-handed set of Locking RATIO Calibrated Machine Heads for electric guitars that use 6-in-line tuners. It has a two-pin casing that can be used as is, or with Graph Tech's Patented InvisoMatch Mounting Plates.

4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes.


- RATIO patented gear technology
- RATIO - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
- From Low E to High E 39:1, 24:1, 20:1, 35:1, 20:1, 12:1.
- Balanced gear ratios for each string simplifying the tuning process.
- With RATIO, a half-turn is a semi-tone!
- Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

-Gear ratio: unique for each string position - one turn-one tone
-Peg holes diameter required: 13/32" (10mm)
-String post diameter: 0.236" (6mm)
-String post length to string hole: 0.910" (23mm)
-Weight per single machine head: 0.083lbs (38g)
-Weight per set of six: 0.496lbs (225g)
-String diameter: up to 72 gauge
-Includes: 6 machine heads, mounting screws and bushings, and complimentary 4 sets of aluminum mounting plates
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.82 lbs
Shipping Dimensions: 5 x 3 x 2 in
Manufacturer Part Number (MPN): PRL-8731-C0

For support or warranty questions, please contact the manufacturer:
Phone: 800-388-7011


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