6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)
6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)
PRL-8721-B0
702725245888
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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, 35:1, 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 PRL-8721 and PRL-8731 are right-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitars that use 6-in-line 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.
- D(Donat (Woody) L.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 stars1 week agoBest Tuners
This is my 3rd guitar that I have replaced tuners and I am very happy with these. Makes tuning easier and faster and fine tuning a breeze.
- GYGeorgy Y.Verified BuyerReviewing6-In-Line Retro Fender Style Ratio Machine Heads (PRN-4624-N0, Nickel Finish)I recommend this productRated 5 out of 5 stars1 week agoThose things handle Bass VI strings with ease
I have Fender Vintera II Bass VI, it came with retro tuning machines and I broke 1 by stripping brass gear.
Installation is very easy, and no hole reaming was required.
Included screws were too small so I reused original ones.
This set handles bass string properly.
Instead of suggested order I just installed tuning machines in ratio order, as all strings are wound and there are no treble strings.
The string set is .024 .034 .044 .065 .080 .100, 30” scale
Finally I don’t have to do a 1/360th turn to tune E.
While not specifically designed for bass strings I still get major benefits of more accurate tuning across all strings.
It was a complete shock honestly to discover that guitars still use same gear ratio across different gauges.
Only downside is that screws holding tuning buttons came loose during first 30 minutes of playing, I added a drop of blue threadlocker and now it’s all good. Obviously it’s not enough to take a star off.
- JTJames T.Verified BuyerReviewing3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)I recommend this productRated 5 out of 5 stars1 week agoOutstanding!
I flat out love them! Well worth the price! They should come as standard equipment on every guitar! 🎸
- MKMichael K.Verified BuyerReviewing7 STRINGS: 7-in-line Electric Locking Machine Heads (PRL-8721-C7, Select Finish)I recommend this productRated 5 out of 5 stars3 weeks agoGreat option for locking and precision tuning
This is my second set of ratio tuners I’ve purchased for an Ibanez RG series guitar and they fit great and the precision of getting your guitar tuning dialed in is amazing.
- GCGarry C.Verified BuyerReviewing3+3 Ratio Acoustic Guitar Machine Heads Gold Finish. "45 Degree mounting screw" (GT-118-D0)I recommend this productRated 5 out of 5 stars3 weeks agoQuality Machine Heads
Very well made, they don't feel flimsy or weak & the tuning is precise, these being the lowest cost model that I tried first & installed a few days ago, very happy with the look & feel but the precision is the most important thing to me as correct precise tuning is paramount!
I would definitely recommend these to friends & family
And will purchase the locking tuners ASAP Especially since the quality & precision are better than
Any others I tried in this price range,
The packaging & instructions plus the money back Guarantee/Quality is simply a win win situation!
As a student appreciate Luthier who's just about to complete my first year at college, I need Quality parts that are the best value for the Money as my real passion is Restoring & Repair/upgrading old Guitar's that just need TLC & Great parts to bring them back to their best or better, thanks to everyone at Graphtech for the hard work building Quality parts that all Instruments deserve!
Best Regards
Garry @ Triple G's,
{God's Grace Guitar's}
"One Love to the World 🌍 from Bonnie Scotland"🏴
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