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6-In-Line Retro Fender Style Ratio Machine Heads (PRN-4624-N0, Nickel Finish)

6-In-Line Retro Fender Style Ratio Machine Heads (PRN-4624-N0, Nickel Finish)



Regular price $189.69 USD
Regular price Sale price $189.69 USD
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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.

RATIO Machine Heads explanation video


The PRN-4624 is a right-handed set of open RATIO® Calibrated Machine Heads in retro look for electric guitar that use 6-in-line tuners.

Fits vintage style guitars (e.g. Fender Style).


Please note that our retro tuners are made to a vintage specification (for 11/32” peghead holes) and will not be a direct replacement for a modern tuner. Please check specifications below.


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


Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 0.346" (8.8mm)
String post diameter: 0.236" (6mm)
String post length to string hole: 0.827” (21mm)
Weight per single machine head: 0.056lbs (25.5g)
Weight per set of six: 0.338lbs (153g)
String diameter up to 72 gauge
Includes 6 machine heads, mounting screws and bushings


Staggered Ratio Measurements.pdfRatio Installation Guide Video


Rated 5.0 out of 5 stars
Based on 5 reviews
Total 5 star reviews: 5 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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5 reviews
  • RL
    Raymond L Lawrence J.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Amazing. Modern technology with retro looks.

    Ratio tuners are hands down, the best. Graoh Tech does tuners right.

  • SF
    Stuart F.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Straightforward installation, superior function, very attractive replacement for Kluson tuners

    I'm very happy with these tuners. They have the vintage vibe I was hoping to get with a smooth, reliable and stable function that I really value - particularly when playing on a gig. The variable ratio feels very natural but just very smooth on the A, D and B strings. There is a bit of adjusting your muscle memory on the G and E strings but it's all for the good. No longer does the high E string require an overabundance of button turning to adjust the pitch and the G and low E now have a noticeably more gradual adjustment which helps to nail the tuning better. Installation could not be easier for replacing existing Kluson tuners. I suspect they have a bit less mass than standard Kluson tuners as well, because they don't have the metal box covering the gearing, and it seems to me that this results in a slightly softer, rounder attack. However, for this guitar (Tele partscaster), I'm alright with that.

  • RL
    Ray Lawrence J.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Best tuners ever created.

    If you are going to attemp to mod your guitar, build a guiter or upgrade a guitar, make Ratio tuners your number one go to choice. When you install Ratio tuners, you are going to experience better tuning stability. I tried a set on an acoustic guitar for the first time and loced the results. I decided to make Ratio tuners my go to choice. Graph Tech has a multitude of great things your guitars need. You are never going to be disappointed by the results of any Graph Tech product.

  • JH
    Jack H.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 months ago

    I installed a set of these in my Whitfill Tele that came with the accursed vintage tuners. Installation was a snap even for an amateur guitar tech like me Results are excellent - solid feel, “micro” tuning capability, good looks. I’m very happy and am eyeing other guitars in my collection that are next in line for a set of these awesome tuning machines..

  • DM
    Dan McLean J.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    6 months ago
    Exactly want I was hoping for

    These are excellent. My guitar tech installed and loved them, and I love using them. Thank you!

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