Your cart is empty.
Your cart is empty.Grover Rotomatic 406C locking guitar tuning machine heads give you easy tuning and positive string locking. With a gear ratio of 18:1, these locking tuners serve up all the goodness of standard Rotomatics - plus Grover's internal cam post. Stick the string through the string hole, hand pull to tension, and begin tuning. As you start to tune, only the locking cam inside the string post turns. The string post itself starts turning once the string is locked. In under one revolution of the string post, you'll be in tune - and you'll stay that way! Upgrade your axe with Grover's Rotomatic 406C locking guitar tuning machines.
Customer
2025-09-04 13:45:09
Perfect replacements for my Orangewood "Oliver" OM size acoustic.Instalation was a breeze... they were a perfect fit, and yes they work beautifully!They're moderately priced and I couldn't imagine a better choice.The 18.1 gear ratio makes tuning quick and smooth. These locking tuners are a wise option that takes the time and frustration out of changing your strings too. These Grovers are groovy!
CJ
2025-07-17 18:34:39
I bought these for my Blackstar Carry-On since it came with very unreliable tuning stability. It couldn't hold tune through an entire song.These Grover locking tuners are exactly what the guitar needed. They are an exact fit, just remove the old ones and pop these in. Only takes a few minutes to get them swapped out. The locking mechanism is really unique though and I wasn't sure how they would work. Totally different than locking tuners on my other dozen guitars. Still not sure how this black magic works to lock the strings but it does indeed work. They work really well in fact. They are also probably the most precise tuners I've ever used. They beat out my locking tuners from Fender, PRS, Gotoh and Musicman. Soooo smooth and no play.
Reviewer
2025-07-12 21:43:24
One of the few things I didn't love about my 2017 PRS SE Custom 24 was the lack of locking tuners. I have them on other guitars and like the fact that they help tuning stability, and especially, make string changes very, very easy. I was told these tuners were good a drop-in option for PRS SE Custom 24, so I ordered these in matching chrome color.Installation was very easy, as you'd expect with a drop-in fit. It was just a matter of a nut and a screw to remove the old stock tuners, and reverse that to install these tuners. It took me only a few minutes while changing each string in the process.Once in place, I was not used to these kind of locking mechanisms. Unlike the Ping/Fender locking tuners (and others), there's no wheel to engage the locking mechanism with these - you simply tune the string up to pitch and the locking mechanism engages. It seems like a leap of faith at first, but it works well once you get used to it.The operation of the tuners is very smooth overall. I'm very happy with that and the high gear ratio, which makes it easy to obsessively tune with precision, as I often do between songs. They definitely add an element of tuning stability over the stock tuners, particularly when using the whammy bar, though having a well-cut, lubed nut will also affect this tremendously.
Nate Carlson
2025-07-04 13:54:00
As others have noted, these are a direct drop-in replacement tuner on (most?) PRS SE guitars.. everything including the screw hole lined up perfectly on the PRS SE Standard I installed them in, and looking at a PRS SE EG, they also line up perfectly for that guitar. I ended up using the screws, washer, and bushings from the PRS tuners; I may also swap the knobs out in the future, if the PRS ones will work (not sure.) [March 2012 - I finally got around to seeing if the PRS knobs would work on the Grover tuners; they will not.. so if you buy these for a PRS SE, be prepared for your guitar to look slightly off "stock". Bummer, as I do like the look and feel of the PRS knob much better.. but then again, with these tuners, hardly have to touch 'em.]One thing I've heard some people mention about locking tuners is that they weigh more.. I didn't think it'd really matter either way to me, but for the fun of it I figured I'd compare using my kitchen scale. I took the card with all six tuners in it out of the plastic package, and weighed the Grover tuners before swapping.. these 406c's come in at 7.05oz. After swapping the tuners, I put the six PRS tuners back into the same card, and weighed them.. they came in at 7.45oz. So the replacement locking tuners actually weigh less than stock. That may be due to the knobs (the Grover knobs are noticeably smaller); not sure if that would make up a full .4oz though.In any case, installation was quick (it took about 20 minutes from the time I removed the old strings to when the new strings with the new tuners were tuned up and ready to go), and after 'stretching' the strings a few times and re-tuning, they seem to be staying in tune pretty well. Time will tell!Also worth noting that these tuners had no problems at all fitting heavier strings; I installed a set of D'Addario EXL117's, which are set up for Drop D tuning, and the heaviest string is a .056.. not the heaviest string in the world, but as heavy as I'm interested in playing.
Matchless
2025-05-30 14:20:16
These are excellent. Got em as replacements for the standard Marvel ones on my Gretsch 5622 - smooth gearing, the plating is very good and looks like it will stand up long term. Easy to use also - a real time saver when r re-stringing.
wr
2025-05-07 16:53:45
Passen perfekt auf die Guild 1512, deren Bohrungen in der Kopfplatte leider nicht 10 mm, sondern ein bisschen kleiner sind (US-Maß halt). Verglichen mit den wackeligen Originalen ist die Qualität der Grover-Tuner so überragend besser, dass die Locking-Funktion fast schon nebensächlich wirkt. Stimmen macht endlich Spaß, und wir haben ja eine 12-Saiten-Gitarre, weil wir gerne und viel stimmen :-D Die Locking-Funktion wirkt sich dann beim nächsten Saitenwechsel aus, und der ist bei 12-Saiten-Gitarren mit herkömmlichen (non-locking) Tunern bekanntlich besonders aufwändig. War erst skeptisch, was die Rotomatic-Funktion angeht (Verriegeln und Stimmen über den Wirbel, keine eine separate Schraube), aber wenn man es einmal durchblickt hat, ist es sogar einfacher. Klar sind sie nicht billig, vor allem weil man für die 12-Saiten-Gitarre zwei Sätze braucht, aber es ist eine riesige Aufwertung. Wer einmal Locking-Tuner hatte, will nie mehr eine Gitarre ohne.
Max
2025-04-13 18:27:49
È la seconda volta che le compro. Le prime per una chitarra elettrica Hofner Shorty, la seconda per una acustica Ibanez Talman. Avevo paura fossero piccole le manopole per l'acustica, invece stanno benissimo. Qualità top.
Bunnygaspan
2025-04-06 15:52:30
I highly recommend this product. The tuning became more stable in my LTD EC-256 and there’s no need to bore new screw holes… perfect fit!!!
Mr. S. Moulster
2025-02-16 15:55:45
I bought a PRS SE Standard 24 just over a year but haven't used it because its tuning stability was hopeless; literally only lasting a few minutes. I love everything else about it but it was unusable. New strings made no difference so I finally decided to do something about it and, after some research into what seems to be a common problem with these guitars, I replaced the nut with a Graphtech PT-6643-00. That did improve things, but didn't cure the problem. I bought these tuners because there was firm evidence that they are a straight swap and I was recording with the guitar within an hour of installation - even on new strings. Some days later, I can pick up the guitar and play it straight off without tuning. The buttons are smaller than the PRS ones, they could be swapped if you don't like the look, but I don't care. Now I have a great sounding, and playing, guitar thanks to theses quality bits of hardware.
Recommended Products
$59.99
$ 31 .99 $31.99