Detail 01
18:1 gear ratio
Provides the fine adjustment ratio described for accurate tuning with less effort.
Product detailSKU #1500000429792
GroverProfessional Mandolin F Style 409 Series Black Button Tuning Machines Chrome
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Independent shopping perspective
The Korena take
Built for F-style mandolins, these 409 Series tuning machines combine an 18:1 ratio with open, staggered worm-over gears for controlled tuning adjustments. The die-cast plate provides the base structure, while bell-top button screws and black buttons give the chrome set a period-minded appearance. They are designed around a 25/64-inch post hole, making post-hole sizing the key check when replacing existing mandolin tuners.
Strong match
Who this is for
- Replacing mandolin tuners on an F-style instrument with 25/64-inch post holes.
- Players who want open-geared mandolin machines with a staggered worm-over layout.
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
Staggered worm-over open gears
Arranges the exposed gears to maintain their intended alignment during operation.
Final check
Know before you order
- 01Confirm that the mandolin uses 25/64-inch post holes before choosing this set.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What instrument are these tuning machines made for?
They are Grover 409 Series machines for F-style mandolins.
02What post-hole size do they require?
They are designed for 25/64-inch post holes.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Black
