What lowering action means and why you might do it
Action is the distance between the strings and the fretboard. Lower action means the strings sit closer to the frets, so you need less finger pressure to play notes clearly. Most players find lower action more comfortable because it reduces finger fatigue and makes faster playing easier. The trade-off is that strings sit closer to the frets, which can cause buzzing if the adjustment goes too far or if the neck isn't straight.
You can lower action at three points on the guitar: the nut (where the strings enter the headstock), the bridge (where they anchor at the body), and the truss rod (which controls the neck's curve). For most electric guitars, the bridge is the easiest place to start, and many players never need to touch the nut or truss rod.
Key Takeaways
- Action is measured as the gap between the strings and the fretboard, and lowering it makes playing less tiring by requiring less finger pressure.
- Most electric guitars have adjustable bridges where you can lower the saddle or use shims to reduce action without special tools.
- Before adjusting anything, measure your current action at the 12th fret so you know where you started and can tell if the change worked.
- Lowering action too far causes string buzz, which means the strings hit the frets when played; if this happens, raise the bridge slightly.
- If lowering the bridge doesn't help, the neck may have too much curve, and you may need to adjust the truss rod or have a technician check the fretboard.
Measure your current action before making changes
Use a ruler or a feeler gauge (a thin metal strip used to measure gaps) to measure the height of the strings above the fretboard at the 12th fret, which is roughly the middle of the neck. Place the ruler flat against the top of the frets and measure the gap between the ruler and the bottom of each string. Write down the measurement for the bass strings (thicker strings on the left) and treble strings (thinner strings on the right) separately—they often sit at different heights.
Standard action heights for electric guitars are roughly 2.0 mm on the bass side and 1.5 mm on the treble side at the 12th fret, though this varies by player preference and guitar type. If your action is much higher than this—say, 3 mm or more—lowering it will make a noticeable difference in how the guitar feels to play.
Lower the bridge saddle on a standard bridge
Most electric guitars have either a fixed bridge with an adjustable saddle or a bridge with individual saddle pieces for each string. On a fixed bridge, the saddle is a single piece of bone, plastic, or metal that sits on top of the bridge. You can lower action by sanding down the bottom of the saddle or replacing it with a thinner one.
To sand the saddle, remove it from the bridge (you may need to loosen the strings slightly to lift it out). Place 220-grit sandpaper on a flat surface and sand the bottom of the saddle in smooth, even strokes until it sits lower in the bridge. Sand a little at a time—remove about 0.5 mm, then reinstall the saddle and measure the action again. It is easier to sand more than to add material back, so go slowly. After sanding, wipe away dust and reinstall the saddle.
If your bridge has individual saddle pieces for each string (common on Fender Stratocasters and Telecasters), you can lower each string independently. Some saddles have set screws on the sides that let you raise or lower them without removing anything. Turn the screw counterclockwise to lower the saddle, checking the action after each quarter-turn. If your saddles don't have screws, you can sand the bottom of individual saddles the same way as a fixed saddle.
Use shims under the bridge on a tremolo system
Guitars with floating tremolo bridges (like a Fender Stratocaster with a whammy bar) sit on springs underneath. Lowering the bridge saddle alone won't help much because the bridge floats—you need to lower the entire bridge body. The easiest way is to place a shim (a thin wedge) under the bridge to tilt it and lower the saddle end.
Cut a shim from thin wood or plastic, roughly 1 to 2 mm thick and the width of the bridge. Loosen the strings slightly, lift the bridge, and slide the shim under the front edge (the end closest to the saddle). Retighten the strings and measure the action. If it's still too high, add another shim. If you've lowered it too far and strings buzz, remove a shim. Once you find the right height, you can glue the shim in place with a small amount of wood glue so it doesn't shift.
Check the neck for too much curve before going further
If lowering the bridge doesn't reduce action enough, or if you get string buzz even after lowering it, the problem may be the neck itself. A neck with too much forward curve (called relief) will keep the strings high no matter how low you set the bridge. You can check this by sighting down the fretboard from the headstock end, looking for a gap between the frets and your line of sight.
A small amount of relief (a tiny gap) is normal and necessary for playability. Too much relief means the truss rod may need adjustment. The truss rod is a metal rod inside the neck that controls this curve. Adjusting it requires a wrench that fits the truss rod nut (usually at the headstock or the body end of the neck) and should be done in small quarter-turn increments. If you're not comfortable doing this yourself, a guitar technician can check the neck and make the adjustment for you—this usually costs between $30 and $75.
Watch for string buzz and adjust if needed
After lowering the action, play the guitar normally and listen for buzzing, which sounds like a rattling or metallic noise when you play a note. Buzzing means a string is hitting a fret it shouldn't. This is the most common sign that you've lowered the action too far.
If you hear buzz on one or two strings, raise just those saddles slightly (a quarter-turn on a screw, or a light sanding of the others to match). If the whole guitar buzzes, raise the bridge a little and remeasure. Remember that some buzz on open strings or the first few frets is often normal, especially on lower-action guitars—the buzz that matters is buzz when you're playing normally up the neck.
Also play the guitar for a few days before deciding the action is right. What feels uncomfortable at first often becomes normal once your fingers adjust, and you may find you prefer slightly higher action than you thought.
When to have a technician do the work
If your bridge doesn't have adjustable saddles, if the saddle is glued in place, or if lowering the bridge doesn't help, a technician should handle it. The same goes if you suspect the frets are uneven (which shows up as buzz on some frets but not others) or if the neck needs truss rod work. A full setup—measuring and adjusting action, intonation, and neck relief—typically costs $75 to $150 depending on where you live and how much work the guitar needs.
Many music shops offer setups as part of their service, and some will do a quick action check for free to tell you whether adjustment is possible or whether the guitar needs professional work. If you're not sure whether your bridge is adjustable or how to access the truss rod, a technician can answer these questions and show you what's possible on your specific guitar.
Frequently Asked Questions
How low can I go without getting buzz?
This depends on how straight your frets are and how much relief your neck has. Most players find 1.5 to 2.0 mm at the 12th fret is a good target. Some guitars with perfectly straight frets can go lower without buzz; others buzz at 2.5 mm. The only way to know is to lower it gradually and listen.
Will lowering action hurt my guitar?
Sanding a saddle or adjusting bridge screws won't damage the guitar. Truss rod adjustments can damage the neck if done wrong, which is why many players leave that to a technician. Sanding too much off a saddle means you'll need a new saddle, which costs $10 to $30.
Do I need special tools?
For bridge saddle work, you need a ruler or feeler gauge and sandpaper. For tremolo bridges, you need a shim and possibly wood glue. For truss rod adjustment, you need the correct wrench size for your guitar's truss rod nut. If you don't have the wrench, a technician has it and can do the job quickly.
Should I lower action on a brand-new guitar?
New guitars often come with higher action than necessary. If it feels uncomfortable to play, lowering it is worth trying. Many players do this as part of a setup before they start playing regularly. Just measure first so you know what you're starting with.
What if only some strings are too high?
If your bridge has individual saddles with adjustment screws, lower just the high strings. If it's a fixed saddle, you may need to sand the saddle unevenly or have a technician shim individual saddles. This is a good reason to take the guitar to a shop if you're not comfortable doing it yourself.