Detail 01
18:1 gear ratio
Allows smaller tuning adjustments than a lower-ratio tuner.
Product detailSKU #1500000429802
GroverProfessional Mandolin F Style 409 Series White Button Tuning Machines Nickel
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Independent shopping perspective
The Korena take
Grover’s Professional Mandolin F Style 409 Series tuners pair nickel hardware with white buttons for a distinct visual update at the headstock. Their 18:1 ratio gives the player finer increments when bringing strings to pitch. Open gears use a worm-over layout, while bell-top button screws add a period-inspired detail. The 25/64-inch post holes and 30.3 mm post length are the key fit dimensions to confirm before making this mandolin hardware change.
Strong match
Who this is for
- Replacing F Style mandolin tuning machines when 25/64-inch post holes and 30.3 mm posts match.
Consider the trade-offs
When to look elsewhere
- Mandolins whose tuner post holes or required post length differ from the listed dimensions.
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 holes
This is the stated post-hole dimension for the mounting location.
Detail 03
30.3 mm overall post length
Check this measurement against the existing tuner arrangement.
Final check
Know before you order
- 01Confirm both the 25/64-inch post-hole size and 30.3 mm overall post length.
- 02Screws are included.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What gear ratio do these tuners use?
They use an 18:1 gear ratio.
02What color are the buttons?
The buttons are white.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- White
