Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Tuner
Graph Tech Graph Tech Ratio Machine Heads (6-in-line, Staggered)
Innovative tuning machines that assign a unique gear ratio to each string for uniform tuning response.
29 guitars checked: 17 likely drop-in, 12 needs verification.
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Where to buy
Amazon
Price not publishedIn stock
Being re-verified
Part specs
Tuner hole size
10mm
ConfirmedMounting pattern
Two-pin casing, usable as-is or with Graph Tech's optional InvisoMatch mounting plates. Staggered posts (PRL-9721/9731 line), for 6-in-line headstocks that do not tilt back. Confirmed via Graph Tech's own product listings.
ConfirmedGear ratio
Not a single ratio by design, RATIO tuners assign a unique gear ratio to each string position so one turn produces the same pitch change on every string, confirmed via Graph Tech's own manufacturer spec sheet
ConfirmedInstallation notes
Remove the existing tuners and insert the Ratio tuners using the supplied bushings. Align the rear locator pin or screw holes (depending on model) and secure with screws. No reaming required for 10 mm headstocks. Check gear ratios for each string.
Guitars we've checked
29 guitars checked: 17 likely drop-in, 12 needs verification.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Comes with different-sized bushings in the box, so it is built to handle small bore variations across Fender tuner holes without needing an exact match.
Why we say this
Graph Tech's Ratio system ships with interchangeable bushings sized for multiple common Fender bore diameters, sidestepping the exact-hole-size question entirely.
Comes with different sized bushings in the box, built to handle small bore variations without needing an exact match.
Why we say this
Graph Tech's Ratio system ships with interchangeable bushings sized for multiple common Fender bore diameters, sidestepping the exact hole size question that affects a plain single-size tuner on this guitar.
Comes with different-sized bushings in the box, built to handle small bore variations without needing an exact match.
Why we say this
Ships with interchangeable bushings sized for the range of bore diameters used across current Fender tuner holes, sidestepping exact hole-size questions.
These tuners use an included adapter plate built specifically for this guitar's two-pin mounting pattern, so the mounting itself is a confirmed fit, not a guess.
Why we say this
This guitar's factory tuners use Fender's dual guide pin mounting, specific to the American Elite and Ultra series. Graph Tech sells InvisoMatch adapter plates purpose-built for exactly this two-pin pattern, marketed explicitly as fitting Fender guitars with modern two-pin mounting, and Ratio sets ship with a selection of InvisoMatch plates included rather than sold separately. This resolves the mounting question directly rather than relying on bore diameter alone.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Comes with different-sized bushings in the box, built to handle small bore variations without needing an exact match.
Why we say this
Ships with interchangeable bushings sized for the range of bore diameters used across current Fender tuner holes, sidestepping exact hole-size questions.
Comes with different-sized bushings in the box, built to handle small bore variations without needing an exact match.
Why we say this
Ships with interchangeable bushings sized for the range of bore diameters used across current Fender tuner holes, sidestepping exact hole-size questions.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Comes with different-sized bushings in the box, built to handle small bore variations without needing an exact match.
Why we say this
Ships with interchangeable bushings sized for common bore diameters, a safe option regardless of the exact peghole size.
Comes with different-sized bushings in the box, built to handle small bore variations without needing an exact match.
Why we say this
Ships with interchangeable bushings sized for common bore diameters, a safe option regardless of the exact peghole size.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Ibanez AZ series uses a curved Fender-like 6-in-line headstock, not the pointed reverse style.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
MH series uses ESP's inline reversed headstock. Graph Tech's InvisoMatch plate needs the correct variant matched to your factory screw pattern, not guaranteed universal.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock. Confirm the correct InvisoMatch plate variant before ordering.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed even with an adapter plate unless the correct variant is used.
Help confirm this fit
This page has 12 open questions
If you have fitted any of these to this Graph Tech Ratio Machine Heads (6-in-line, Staggered), tell us what you found and we'll update the data.