Detail 01
Gear ratios: 48:1, 39:1, 24:1, 20:1, 35:1, 20:1, 12:1
The seven ratios are calibrated by string to give each one the same adjustment response.
Product detailSKU #1500000397833
Graph Tech7-String Ratio 4+3 Electric Locking Tuning Machine Heads Black 7 String
1/8
Independent shopping perspective
The Korena take
Designed for a right-handed seven-string electric guitar with a 4+3 headstock, this black locking Ratio tuner set calibrates a different gear ratio to each string. Its tuning response is consistent across all seven strings, with a half-turn producing one semitone of change. The two-pin casings may be mounted directly, or used with the four included brushed-aluminum InvisoMatch plate sets to use existing screw holes on many guitars. It is identified for many Gibson, Epiphone, and PRS-style instruments.
Strong match
Who this is for
- Replacing locking tuners on a right-handed seven-string guitar with a 4+3 headstock.
- 4+3 Gibson-, Epiphone-, or PRS-style guitar projects requiring calibrated locking machine heads.
- Installations using existing screw holes with the supplied InvisoMatch plate sets.
Consider the trade-offs
When to look elsewhere
- Guitars without a 4+3 headstock configuration.
- Peg holes that do not measure 13/32 in. (10 mm).
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
String-post diameter: 0.236 in. (6 mm)
Use this dimension when checking tuner hardware fit.
Detail 03
String-post length to string hole: 0.910 in. (23 mm)
Compare this post measurement with the existing machine heads during installation planning.
Final check
Know before you order
- 01Verify that the guitar is right-handed, has a 4+3 headstock, and uses 13/32 in. (10 mm) peg holes.
- 02The two-pin casing can be used directly or with the included InvisoMatch mounting plates.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Are these locking machine heads?
Yes. They are locking Ratio machine heads for seven-string electric guitar.
02Which headstock layout do they require?
They are made for a 4+3 tuner configuration.
03Are InvisoMatch plates included?
Yes. Four brushed-aluminum InvisoMatch mounting-plate sets are included.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
4 detailsOther
- Category Source
- detail
- Tier
- new
- Korena Special
- false
- Source Id
- site51500000397833
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