U.S. buyers may incur an import tariff of up to 145% on this product due to its country of origin (China)
or for Korean products
U.S. buyers may incur an import tariff of up to 35% on this product due to its country of origin (Korea)
Ratio by Graph Tech (6:1) Ukulele Tuner Regular Button (4 pc set) Black #PRU-4004-BK
Ratio by Graph Tech (6:1) Ukulele Tuner Regular Button (4 pc set) Black #PRU-4004-BK
5.0 / 5.0 Based on 348 reviews
PRU-4004-BK
702725243327
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RATIOĀ® patented gear technology
RATIOĀ® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
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Tune-a-Lele Ukulele tuners areĀ the world's lightest machine heads, with a uke friendly 6:1 gear ratio!
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ThisĀ super light, yet strongĀ machine headĀ makes ukes balanced, not headstock heavy, and withĀ zero backlashĀ makes tuning so much easier.Ā
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The PRU-4004-BK is a set of RATIOĀ® Machine Heads for ukuleles that use 4 tuners.
These ukulele machine heads are a perfect fit for all types of ukuleles including the Soprano type.
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Gear ratio: 6:1
Peg holes diameter required: 0.236" (6mm)
String post diameter: 0.232" (5.9mm)
Bushings diameter: 0.344" (8.75mm)
String post length to string hole: 0.732ā (18.6mm)
Weight per single machine head: 0.011lbs (5g)
Weight per set of six: 0.044lbs (20g)
String diameter up to 50 gauge (up to 1.3mm diameter)
Includes 4 machine heads, mounting screws and bushings

- DDDave D.Verified BuyerReviewingRatio by Graph Tech (12:1 to 39:1) Acoustic Locking 3x3 Cont Chrome #PRL-8411-C0I recommend this productRated 5 out of 5 starsYesterdaygood tuners
Quick service and good product.
Was this helpful? - JCJohn C.Verified BuyerReviewingRatio by Graph Tech (12:1 to 39:1) Acoustic 3x3 Cont Chrome #PRN-2411-C0I recommend this productRated 5 out of 5 stars2 days agoThese have become an absolute necessity on all of my non-locking guitars
My journey into Graph Tech Ratio tuners began with replacing stock tuners on a bass guitar about a year ago and has continued with me installing Ratio tuners on every non-locking, non-microtuner bearing guitar that I own. I have installed 7 sets across standard and multiscale basses and guitars with an 8th set to be installed soon. I currently work as a mix and production engineer, and having instruments perfectly and, almost more importantly, easily in tune heads off so many problems before they can manifest. Yes, the Ratio tuners are an additional expense. Yes, they are sometimes as much as 50% more than a set of high quality tuners from Gotoh, but the ease in getting and keeping an instrument in tune is well worth the additional cost for me because dependable and exact tuning saves me hours of time in sessions.
The difference is real, else I wouldn't keep buying and installing these units. Especially since my OCD self has to be okay with hardware finishes sometimes not matching on a guitar since the Ratio tuners only come in 2-4 finishes depending on the set. More finishes would be great, but I can also attest to the wear quality of the sets that I have. The limited number of finishes may be just to ensure that their products wear well. (I'm looking at you, "Cosmo Black" from Ibby. Damn those finishes wear quickly even with appropriate care.)
Was this helpful? - JSJere S.Verified BuyerReviewingRatio by Graph Tech (12:1 to 39:1) Electric Locking 4x2 MiniCont Chrome #PRL-8421-C0I recommend this productRated 5 out of 5 stars1 month agoJust best
Easy assembly, they work fine. Best tuners I've ever had.
Was this helpful? - DFDavid F.Verified BuyerReviewingRatio by Graph Tech (23:1 to 48:1) Lefty Bass 4 in-Line F Style Chrome #PRB-4401-LC0I recommend this productRated 5 out of 5 stars1 month agoUpgrade after 40 years
I had an old bass that got pushed to the back of the closet because it didn't stay in tune. Renewed intrest in playing caused me to get new tuners. Installed them, and now it is my favorite bass again . Best decision in years.
Was this helpful? - MMMichael M.Verified BuyerReviewingRatio by Graph Tech (12:1 to 39:1) Electric Non-Locking 4x2 MiniCont Chrome #PRN-2321-C0I recommend this productRated 5 out of 5 stars1 month agoElectric guitar tuners.
I'm a luthier specializing in repairs to stringed instruments.
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