3+3 Ratio Acoustic Locking Guitar Machine Heads (PRL-8411, PRL-8441, Select Finish and Button Style)
3+3 Ratio Acoustic Locking Guitar Machine Heads (PRL-8411, PRL-8441, Select Finish and Button Style)
PRL-8411-C0
702725245208
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RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
From Low E to High E 39:1, 24:1, 20:1, 14:1, 20:1, 12:1.
We balanced the gear ratios to each string simplifying the tuning process.
With RATIO®, a half-turn is a semi-tone!
Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.
The PRN-8411 and PRN-8441 are right-handed sets of Locking RATIO® Calibrated Machine Heads for acoustic guitar that use 3 per side tuners.
It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab].
4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes.
Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 13/32" (10mm)
String post diameter: 0.236" (6mm)
String post length to string hole: 0.910” (23mm)
Weight per single machine head: 0.083lbs (38g)
Weight per set of six: 0.496lbs (225g)
String diameter up to 72 gauge
Includes 6 machine heads, mounting screws and bushings
Includes complimentary 4 sets of aluminum mounting plates
Invisomatch Mounting Plates
InvisoMatch Mounting Plates for RATIO Tuned Machine Heads are the easiest approach to installing Ratio Tuned Machine Heads on your guitar.
Simply select the installation plate design that matches the screw/pin hole location of your factory installed machine heads.
You’ll be up and running within minutes, perfectly installed and aligned. Stay classy you axe master.
For stunning accuracy and response... upgrade to Ratio Machine Heads with it's patented Multi-Geared Tuning Technology.
The new standard in tuning.
NO DRILLING, PERFECT ALIGNMENT, FAST INSTALLATION
With InvisoMatch mounting plates you will reduce the time to install RATIO machine heads to well under 15 minutes.
The alignment of the machine heads is perfect, no holes to drill or fill, ideal for vintage instruments.
Four sets of brushed aluminum InvisoMatch mounting plates come free with every set of Ratio Tuners.
Premium finishes including chrome, nickel, black and gold are available for order.
“After reading some reviews and seeing the ads, I decided to try a set of Graph Tech’s ratio tuners on my American standard Strat. The tuners arrived and I was very pleased with the quality and finish. Installing the tuners was a breeze using the included InvisoMatch plates — no need to drill any holes in my beloved Strat and the performance of these tuners is outstanding!"
"Tuning becomes incredibly easy and holds tune even when using the tremolo bar. I would highly recommend these as a great upgrade to any guitar and will be telling my customers what a great addition they would be for very stable and easy tuning.
Thanks, Graph Tech for a great product.!
Jay Langan / Magdon Music / guitar sales/ guitar tech
Click a picture to open a PDF file with the dimensions.
- NFNardo F.Verified BuyerReviewing3+3 Ratio Electric Guitar Machine Heads (PRN-2311, 2341, please select finish and button style)I recommend this productRated 5 out of 5 stars16 hours agoAmazing keys
If you have pot metal tuners, toss them out , these are very high quality, and the function off the chart .
- PPPasi P.Verified BuyerReviewing3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)I recommend this productRated 5 out of 5 stars21 hours agoWell worth the price.
Replaced my puke green machine heads on my ES 135 with these and I am very happy. Fits like a glove...
- JRJoseph R.Verified BuyerReviewing3+3 Ratio Acoustic Guitar Machine Heads (PRN-2411, 2421, Select Finish and Button Style)I recommend this productRated 4 out of 5 starsYesterdayTime for a change.
I liked the ease to install. The quality appears top shelf. Forty years of heavy use destroyed my original machine heads. This was a necessary change to maintain tune. I am pleased with the decision to purchase from graphtech. I'll report back if they fail to function as intended.
- MTMatthew T.Verified BuyerReviewing7 Strings: 3+4 Ratio Electric Locking Machine Heads (PRL-8621, Select Finish and Button Style)I recommend this productRated 5 out of 5 stars2 days agoThey are very nice tuners
Hello! I put these tuners on my Jackson JS22-7 string. The post height is subtly lower, but they fit very thick gauge strings and lock. The post height is probably more optimal. I wish I knew that it was possible, and desirable, to buy the black colored adapters and that I would have to use adapter plates. I'm not bagging on the adapter plates - they are an advance, and made installation super easy. I just wish I had the black ones. It stays in tune well. Good stuff!
- MWMark W.Verified BuyerReviewing6-In-Line Ratio Electric Locking Machine Heads Staggered Posts (PRL-9721, Select Finish and Button Style)I recommend this productRated 5 out of 5 stars3 days agoFantastic machine heads
Fantastic tuners which were a straight swap on my FMT Telecaster. Took all of ten minutes to install and restring. The stock tuners were OK but these are so much better. The ratios of the gearing makes a huge difference. I'm planning to get some for my other guitars. Utterly fabulous!