How to Adjust a Tune-o-Matic Bridge

What the Tune-o-Matic bridge does

The Tune-o-Matic bridge is a fixed bridge design found on many electric guitars. It has two main jobs: to set the height of the strings above the fretboard, and to establish the correct vibrating length of each string so the guitar plays in tune across the fretboard. The bridge transfers string vibration into the guitar body, a role that also affects tone and sustain.

Because it is a fixed bridge, it does not move when you bend strings or use the whammy bar. That stability makes it a popular choice for players who want consistent tuning and a solid feel. The two independent adjustments, height and intonation, give you control over playability and pitch accuracy.

Tools and preparation

You need two basic tools: a small Phillips-head screwdriver for the intonation screws, and a tuner, preferably a clip-on or pedal tuner, for checking pitch. A clean workspace and good lighting help you avoid losing small parts. Before you start, play the guitar to notice where the action feels off and where notes are sharp or flat. This gives you a baseline.

It is also worth checking that the guitar's neck has the correct amount of relief before adjusting the bridge. The neck bow affects string height, and a truss rod adjustment may be needed first. If you are unfamiliar with that process, read our guide on guitar action and setup.

• Small Phillips screwdriver
• Reliable tuner (clip-on or pedal)
• Clean, well-lit workspace

Adjusting bridge height

The overall height of the bridge is controlled by the two large thumbwheels on the threaded posts that anchor into the body. Turning them clockwise raises the bridge, turning them counterclockwise lowers it. Lowering the bridge reduces the distance between strings and frets, making it easier to press down, but sets the string closer to the frets, which can cause buzz. Raising it gives more clearance and reduces buzz, but makes the strings feel stiffer and can make high-fret access less comfortable.

Start by lowering the bridge until the strings are as low as you would like, then play every fret on each string to check for buzzing. If you hear a buzz, raise the bridge a small amount and test again. Work in small increments, perhaps a quarter-turn of the thumbwheel at a time. Always tune the guitar back to pitch before evaluating the feel, because string tension changes when you move the bridge. For more on finding your preferred action, see guitar action and setup.

Adjusting intonation (saddle position)

Intonation is the adjustment that makes each string play in tune at every fret. Each saddle sits on a small screw that moves the saddle forward (toward the neck) or backward (toward the tailpiece). To set it correctly, tune the open string with your tuner, then fret the string at the 12th fret and compare that note to the tuner. If the fretted note is sharp, the string is effectively too short, so move the saddle backward, away from the neck. If it is flat, move the saddle forward, toward the neck.

Make only a small movement of the screw, then re-tune the open string and check the 12th-fret note again. The two adjustments affect each other slightly, so repeat the process until the open string and the 12th-fret note agree. Work through all six strings one at a time. A fresh set of strings makes this easier, because old strings can stretch or lose tension inconsistently. For a deeper understanding of intonation, read our guitar intonation guide.

Fine-tuning and common pitfalls

After you have set height and intonation, play through a range of chords and single notes. Listen for any buzz or tuning problems, and adjust again in small steps. Sometimes changing the height alters the intonation, so check both together. A common mistake is to turn the thumbwheels without loosening the strings, which puts excessive tension on the posts. Always detune the strings slightly or support the bridge while turning the wheels, especially when raising the bridge.

Another pitfall is over-tightening the intonation screws, which can strip the threads or damage the saddle. If a screw feels stuck, apply a tiny drop of lubricant rather than forcing it. Also, be aware that the bridge's radius might not match your fretboard radius. Many Tune-o-Matic bridges have a pre-set radius, but you can check by eye or with a radius gauge. If the strings sit unevenly, you may need to have the saddles shimmed or replaced. For a general overview of bridge types, see bridge types explained.

What to pick for your use

Questions

Do I need to adjust intonation every time I change strings?

Not necessarily, but it is a good idea to check. A new set of strings can differ slightly in tension and diameter, which may shift intonation. You only need to make small corrections, and the process is quick once you are familiar with it.

Can I use a clip-on tuner for intonation adjustments?

Yes. A clip-on tuner senses string vibration and works well for this task. Make sure the tuner is accurate and has a fast response. A pedal tuner is also fine. The key is to use the same tuner for both the open string and the fretted note.

What if my bridge thumbwheels are hard to turn?

The thumbwheels can be tight because of string tension. Slightly loosen the strings first, turn the wheels, then re-tune. If they remain stiff, a drop of light oil on the threads can help, but be careful not to get any on the finish.

Should I adjust the truss rod before the bridge?

Usually yes. The truss rod controls the neck relief, which affects the string height at the middle frets. If the neck is too bent, the bridge cannot compensate. Check the relief first and make truss rod adjustments if needed, then move to the bridge.

How does the bridge height affect the feel of bending strings?

Bridge height changes the tension you feel when bending. A higher bridge increases the distance the string must travel to fret, making bends require more force. Lowering the bridge reduces that distance, making bends feel slinkier. However, a very low bridge can cause strings to rattle against higher frets, so balance that against your preferred feel. Many players lower the bridge first for comfort, then raise it only if buzz appears. Remember to re-tune after any height change, as string tension alters slightly.