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 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.
Illustration, photo coming soon
Where to buy
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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.
Gear 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
Installation 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.
Fits this guitar's 10mm tuner holes. They also ship with several bushing sizes in the box, so small variations between individual guitars are covered.
Why we say this
The AZ2204 has a curved 6-in-line headstock, so a 6-in-line tuner set is the correct shape here, not the pointed reverse-headstock version used elsewhere in Ibanez's range. The guitar's tuner holes are 10mm. Graph Tech's Ratio machine heads ship with a set of interchangeable bushings covering the common bore diameters, so 10mm is comfortably inside what they handle and the fit does not depend on a precise measurement.
Fits this guitar's 10mm tuner holes. They also ship with several bushing sizes in the box, so small variations between individual guitars are covered.
Why we say this
The AZ2402 Prestige has a curved 6-in-line headstock, so a 6-in-line tuner set is the correct shape here, not the pointed reverse-headstock version used elsewhere in Ibanez's range. The guitar's tuner holes are 10mm. Graph Tech's Ratio machine heads ship with a set of interchangeable bushings covering the common bore diameters, so 10mm is comfortably inside what they handle and the fit does not depend on a precise measurement.
These come with a range of bushing sizes in the box, so they fit whether your tuner holes are vintage-sized or the larger modern size. That makes them the safest tuner choice on this guitar, because its exact hole size isn't confirmed.
Why we say this
The AZES40 has a curved 6-in-line headstock, so a 6-in-line tuner set is the correct shape here, not the pointed reverse-headstock version. Graph Tech's Ratio machine heads ship with a set of interchangeable bushings covering the common bore diameters, so the housing seats whether a headstock is drilled vintage-size or to the modern 10mm standard. That is what makes this a safe call on the AZES40 specifically. Ibanez's own spec sheet lists the stock tuners as split-shaft machine heads, a vintage-style design that normally uses a bore under 9mm, and the guitar's actual hole diameter is not published or independently measured, so a fixed-bore tuner cannot be called a drop-in here. This one does not depend on that answer.
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.