Graph Tech

Graph Tech 6-In-Line Ratio Electric Locking Machine Heads – PRL-8731-CO

  • Only
  • $136.80
  • Regular price $160.94
  • Will be in stock after February 17, 2023
Shipping calculated at checkout.

SKU: 310755 UPC: 702725245796

Graph Tech 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.
  • Graph Tech balanced the gear ratios to 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.

The PRL-8731 right-handed sets 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. 

  • 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
  • Includes complimentary 4 sets of aluminum mounting plates