The Gotoh SGS510 is a style of machine head (a.k.a. tuning peg) installed on a handful of Ibanez guitar models. It is manufactured by the G-GOTOH Gut Co., Ltd. in Japan as part of the company's flagship SG510 series
The SGS510 offers a 1:15 gear ratio. Its smaller size makes it suitable on for either six-inline or three-on-a-side (L3+R3) headstock configurations. A variety of button shapes are available, though most Ibanez guitars are equipped with the rounded "bean" shaped L5 button. It is available in locking and non-locking versions although the non-locking version is used nearly exclusively in the Ibanez applications.
MG-T locking mechanism
The Gotoh MG-T (Magnum Lock-Trad) mechanism allows the user to lock the tuners once the instrument is in tune. It features a thumbscrew locking mechanism to stabilize tuning while playing and preventing incidental contact with the tuners from altering the instrument's tuning.
MG locking mechanism
The Gotoh MG (Magnum Lock) mechanism allows the user to lock the tuners once the instrument is in tune. Instead of a thumbscrew locking mechanism like the MG-T variety (see above) the Magnum Lock mechanism is engaged as the user twists the button to adjust the tuning.
Height adjustable locking posts (H.A.P-M)
The SGS510 is available with height-adjustable posts (H.A.P). This allows the user to adjust individual strings to dial in the oscillation, which contributes to sustain. The H.A.P-M design combines the adjustable post height with the Magnum Lock system.
Similar tuning machines
The Gotoh SGS510Z is a similar model with a 1:18 gear ratio. The Gotoh SGL510 is a similar model with a slightly larger body which is suitable only for 3+3 use and a 1:18 gear ratio. Gotoh makes a more affordable tuning machine, the Gotoh SG381, which is used on a large number of Ibanez guitars. The SG381 is interchangeable with the SGS510 in terms of installation.
- SGS510 product page, G-Gotoh Gut Co., archived February 2021