Detail 01
Sealed, lubricated gears
The gear mechanism is described as sealed and lubricated for tuning adjustments.
Product detailSKU #1500000429891
GroverRoto-Grip Locking Rotomatics 502 Series Keystone Button Tuning Machines Black Chrome
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Independent shopping perspective
The Korena take
Grover’s 502 Series Roto-Grip tuners pair keystone buttons with a thumbscrew string-locking system, making restringing a faster part of regular guitar maintenance. Sealed, lubricated gearing supports precise tuning adjustments, while the black chrome finish gives the headstock a coordinated hardware option. The 25/64-inch post hole and 28.2 mm overall post length are part of the installation and stringing setup, so confirm those details against the instrument before ordering.
Strong match
Who this is for
- Restringing a compatible guitar when a thumbscrew locking system is part of the preferred setup.
- Replacing compatible tuners while retaining a keystone-button black chrome hardware look.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
25/64-inch post hole; 28.2 mm overall post length
These measurements are installation details to compare with the existing tuner arrangement.
Final check
Know before you order
- 01Verify that the guitar accepts this 502 Series drop-in tuner format.
- 02Check the 25/64-inch post hole and 28.2 mm overall post length against the existing hardware.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How are strings secured?
A thumbscrew mechanism locks the strings into place.
02What button style and finish does this version use?
It has keystone buttons in black chrome.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Black
