• Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
  • 6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style) - Graph Tech Guitar Labs Ltd.
  • Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
  • Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
  • Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
  • Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
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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-C0

702725245833

$160.94 USD
$160.94 USD
Sale Sold out
Select Finish
Select Button Style

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.

RATIO Machine Heads explanation video

 

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.

 

6-in-line tuners set  Ratio Tuned Machine Heads: The New Standard In Tuning Technology

 

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

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5.0
Rated 5.0 out of 5 stars
Based on 10 reviews
Total 5 star reviews: 10 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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10 reviews
  • PK
    Phil K.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    6 days ago
    Drastic improvement

    I was having tuning stability issues on my Mexican Tash Sultana Signature Strat. I did have to drill holes to get these to fit, which I was a bit of a leap of faith. However, after doing so, it’s such an immense improvement. Super happy with my purchase.

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  • JA
    Jeffrey A.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Drop in Replacement for G&L Tribute ASAT Classic Bluesboy

    This set of tuners fit perfectly in my tribute ASAT classic. Very easy to replace. The original tuners did a poor job of keeping in tune. When my guitar tech suggested that the guitar needed better tuners I knew that they had to be changed. Did it myself. Took very little time. Now stays in tune as I play, and the guitar is much more enjoyable.

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  • IM
    Ian M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    5 months ago
    Black Ratios

    Loved them. The engineering is superb and the finish was perfect. They really finished of my guitar. I liked the added plectrums, I'm now looking to decide my preference and lay in a supply

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  • DP
    Darwin P.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    6 months ago
    The Right Stuff

    I bought the black color in the 6-in-line ratio locking machine heads and chose the contemporary style. I installed them on a blonde Squier Affinity Telecaster. I still need to add black backing plates in the future to cover the holes left when I removed the machine heads that came on the guitar. This did not happen when I installed them on a Squier Affinity Stratocaster. Now, I'll tell you what I think of the quality of this product. Everything that the advertising said would happen when I bought them is true. They are easy to install, changing strings with the locking mechanism is a snap, adjusting to barely having to turn the smooth metal head when it is time to retune each string takes very little time and the way that they look on the guitar is super. I would highly recommend these ratio electric locking machine heads to anyone wishing to upgrade their guitar.

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  • RM
    Russell M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    9 months ago
    Custom guitar build

    High quality parts, very satisfied.

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