Description
Break a string mid-set and you’ll appreciate what Grover did here: took the bulletproof Rotomatic gear train and bolted on a thumb-screw locking mechanism at the post. Feed the string through the hole, wrap it once, snug the thumb screw, and you’re back in tune with minimal winding and minimal slippage. It’s the kind of detail that matters more the harder you play.
Under the hood, the 502 Series runs the same sealed, lubricated gears Grover is known for, with an 18:1 ratio for fine, controlled pitch adjustment — no more overshooting on delicate tuning tweaks. The posts are sized to handle up to .074″ strings, so baritones and heavier gauges are fair game.
- Sealed-in, lubricated gears
- 18:1 gear ratio
- 25/64″ post hole
- Post length to hole: 23mm
- Overall post length: 28.2mm
- Weight: 1.6oz per tuner / 9.6oz per set
- Max string gauge: .074″
- Includes mounting hardware (bushings, washers, screws)
This nickel-finish 502N set comes as 3 treble and 3 bass tuners — a standard set of 6 for guitar. It’s also a direct drop-in for players upgrading from Grover’s 102-18, 102V, 103, 106, 109, 109-18, and 509 Series (note: on 135/136 Series swaps, the top mounting hole will remain visible).
Want Keystone buttons instead? Grover offers this same mechanism as the 502NK.
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