Detail 01
18:1 gear ratio
Provides precision-tuning control.
Product detailSKU #1500000429795
GroverProfessional Mandolin A Style 409 Series White Button Tuning Machines Chrome
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Independent shopping perspective
The Korena take
For an A-style mandolin, the Grover 409 Series white-button machines combine open gears in a modern post-hole configuration with a die-cast plate for correct alignment. An 18:1 ratio supplies the precision-tuning control described for maintaining intonation. The 25/64-inch post hole and 30.3 mm overall post length define the stated setup dimensions and provide flexibility in setup. Bell-top button screws add a vintage visual note to an otherwise modern open-gear layout.
Strong match
Who this is for
- A-style mandolin setup using the specified 25/64-inch post hole and 30.3 mm post length.
- Precision tuning work where an 18:1 ratio supports stable intonation.
Consider the trade-offs
When to look elsewhere
- Mandolins without the specified 25/64-inch post-hole size.
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
Die-cast plate and open-gear post-hole configuration
The configuration is described as ensuring correct alignment for stable intonation.
Detail 03
30.3 mm overall post length
This dimension is identified as providing flexibility in setup.
Final check
Know before you order
- 01Verify the 25/64-inch post-hole size and 30.3 mm overall post length for your planned setup.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What post-hole size is specified?
These machine heads are specified with a 25/64-inch post hole.
02What is the overall post length?
The overall post length is 30.3 mm.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- White
