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Graph Tech Graph Tech

Graph Tech 5-String Ratio 3+2 Bass Y-Style Button Black 5 String

Q&A SKU #M02017000001001
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Ratio calibrated machine heads for bass guitars that use 3 x 2configuration.

The Graph Tech 5-string Ratio 3+2 Bass Y-Style button tuning machine heads incorporate different string gauges into the tuning equation. 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 adjustments, delivering predictable, precise tuning on every string. The Graph Tech PRB-5320 is a right-handed set of Ratio calibrated machine heads for bass guitars that use 3 x 2configuration.


  • Includes:
  • 5 machine heads
  • Mounting screws
  • Bushings

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5-String Ratio 3+2 Bass Y-Style Button Specifications:

  • Gear ratio: 48:1, 36:1, 30:1, 20:1, 18:1
  • Peg holes diameter required: 35/64" (14mm)
  • String post diameter: 0.547" (13.9mm)
  • String post length to string hole: 1.030" (26.1mm)
  • String diameter up to 0.98 gauge (or larger if taper-wound)

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