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
Gotoh SG381 Locking Tuners (Magnum Lock-Trad), 6-in-line
The locking version of Gotoh's SG381, using their Magnum Lock-Trad system, a rear thumbscrew that clamps the string in place.
26 guitars checked: 14 likely drop-in, 11 needs verification, 1 not compatible.
For your Jackson King V KVX
Needs verificationHole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
See the full notes below
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Part specs
Tuner hole size
10mm
ConfirmedGear ratio
16:1
ConfirmedMounting pattern
Single mounting screw per tuner, offset 45° from the post on 6-in-line headstocks, with staggered post heights for the correct break angle. Same physical mount as Gotoh's non-locking SG381, the Magnum Lock mechanism is internal.
Guitars we've checked
26 guitars checked: 14 likely drop-in, 11 needs verification, 1 not compatible.
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.
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.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Explorer uses a 6-in-line, non-staggered-post headstock rather than Gibson's usual 3+3, confirmed compatible with generic 6-in-line non-staggered aftermarket tuner sets.
Matches this guitar's 10mm tuner holes. A straightforward locking upgrade, no reaming or drilling.
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, the modern standard Ibanez use across the AZ Prestige and Premium line with their sealed Gotoh machine heads. Gotoh specify the same 10mm bore for the SG381 housing, so it seats in the existing holes without reaming.
Matches this guitar's 10mm tuner holes. A straightforward locking upgrade, no reaming or drilling.
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, the modern standard Ibanez use across the AZ Prestige and Premium line with their sealed Gotoh machine heads. Gotoh specify the same 10mm bore for the SG381 housing, so it seats in the existing holes without reaming.
Matches the tuner holes already on this guitar. A straightforward upgrade, no drilling needed.
Why we say this
Matches the confirmed 10mm bore used on this guitar's Edge Zero II-equipped headstock, and this guitar already ships with Gotoh MG-T locking tuners in the same family.
Matches the tuner holes already on this guitar. A straightforward upgrade, no drilling needed.
Why we say this
Matches the confirmed 10mm bore used on this guitar's Edge Zero II-equipped headstock.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard Gibson-style single-cut 3+3 layout on 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.
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
MH series uses ESP's inline reversed headstock. Owner reports on similarly shaped reverse headstocks describe aftermarket tuner screw holes not lining up with factory pilot holes.
Help confirm this fit
These need a 10mm tuner hole. The stock tuners on this guitar are a vintage split-shaft type, which usually means a smaller hole, and the exact size isn't confirmed. Measure yours before buying.
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. Hole size is the open question. Gotoh specify a 10mm bore for the SG381 housing. Ibanez's own AZES40 spec sheet lists the stock tuners as split-shaft machine heads, a vintage-style design that normally uses a bore under 9mm rather than the 10mm modern standard, and the AZES40's actual hole diameter is not published anywhere and has not been independently measured. The higher-tier AZ2204 and AZ2402 Prestige ship Gotoh sealed tuners at 10mm, but that is a different tuner design on a different production tier and does not settle the AZES40.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Not compatible
Ibanez
GRG120BDXL Left-Handed
This is the right-handed version. Gotoh make a genuine left-handed set, and that's the one to use on this guitar.
Why we say this
This is the right-handed Gotoh SG381 Magnum Lock-Trad set. Gotoh build a genuine left-handed version of the same tuner, and that is the version this guitar needs.
What fits instead
This page has 11 open questions
If you have fitted any of these to this Gotoh SG381 Locking Tuners (Magnum Lock-Trad), 6-in-line, tell us what you found and we'll update the data.