Item #1584940 Model #PRN-4624-N0

Graph Tech Ratio In-Line Retro Fender-Style Tuning Machine Heads Nickel 6 String


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In-line retro-style tuning machine heads that deliver predictable, precise tuning on every string.

Graph Tech Ratio In-Line Retro Fender-style tuning machine heads deliver predictable, precise tuning on every string. Graph Tech balanced the gear ratios to each string to simplify the tuning process. With Ratio 6-in-line tuning machines, a half turn is a semi-tone. Every string reacts the same to any tuning adjustment. The Graph Tech PRN-4624 is a right-handed set of open Ratio calibrated retro-looking machine heads for electric guitars that use 6-in-line tuners. The Graph Tech Ratio in-line retro Fender-style tuners fit vintage-style guitars.

As a note, Graph Tech’s retro tuners are made to a vintage specification (for 11/32" peghead holes) and will not be a direct replacement for a modern tuner.
  • Gear ratio: 39:1, 24:1, 20:1, 35:1, 20:1, 12:1
  • Peg holes diameter required: 0.346" (8.8mm)
  • String post diameter: 0.236" (6mm)
  • String post length to string hole: 0.827" (21mm)
  • String diameter up to 72 gauge


  • One turn equals one tone
  • Includes 6 machine heads, mounting screws and bushings