Steel vs Nylon Guitar Strings: The Differences Explained

Steel and nylon strings look like a small detail, but they define two different families of guitar. The type of string affects the sound, the feel under your fingers and even how the guitar is built. Here is what sets them apart, why you can’t simply swap one for the other and how to decide which is right for you.

What the strings are made of

Nylon strings are used on classical and flamenco guitars. The three treble strings are usually plain nylon or a similar polymer such as fluorocarbon. The three bass strings have a core of fine nylon filaments wrapped in metal wire, often silver-plated copper.

Steel strings are used on steel-string acoustic guitars and electric guitars. The treble strings are plain steel wire, and the bass strings are steel cores wrapped in another metal. On acoustic guitars the wrap is usually bronze or phosphor bronze; on electric guitars it is usually nickel-plated steel, pure nickel or stainless steel.

How they sound

Nylon strings produce a warm, soft and rounded tone with less sustain. It suits classical music, flamenco, bossa nova and gentle fingerstyle playing.

Steel strings are brighter and louder, with more sparkle and sustain. On an acoustic guitar they cut through for strummed chords in folk, pop, country and rock. On an electric guitar they are essential for the sound of the pickups.

How they feel

Nylon strings run at lower tension and are softer, so they are generally kinder to fingertips while you build calluses. Classical guitars usually have a wider, flatter neck, which gives the fingers more room but can feel like a stretch for chord shapes, especially for people with smaller hands.

Steel strings are under higher tension and feel firmer, so they can be sore on the fingertips for the first few weeks. Steel-string guitars usually have narrower, slightly rounded necks, which many players find comfortable for chords and lead playing.

They are built for different guitars

A guitar is designed around the tension of the strings it is meant to carry:

• Classical guitars have lighter internal bracing and, in many cases, no adjustable truss rod in the neck. They are built for the low tension of nylon strings.
• Steel-string acoustic and electric guitars have stronger bracing and an adjustable truss rod to resist the much higher pull of steel strings.

Never put steel strings on a classical guitar

The extra tension of steel strings can damage a classical guitar: the bridge can lift, the top can distort and the neck can bend. The strings also attach differently, so they will not fit properly. Unless the maker says a specific model is designed for steel strings, don’t try it.

Nylon on a steel-string guitar is not a good swap either

Nylon strings are thicker than steel strings at similar pitches, so they may not fit the nut slots, and the low tension usually leaves the guitar sounding quiet and feeling floppy. Ball-end nylon strings exist, but they are a compromise. If you want the nylon sound, a classical or crossover guitar is the better answer.

Tension and how the strings attach

Steel strings come in gauge sets, such as extra light, light and medium, named after the thickness of the strings. Lighter gauges are easier to play; heavier gauges give more volume and body. Nylon strings are usually sold by tension instead, such as normal, medium, high or hard tension.

Steel strings for acoustic and electric guitars normally have a small ball at one end that anchors them in the bridge. Most classical strings are tie-end: you loop and knot them around the bridge. Changing classical strings takes a little more practice, but it quickly becomes routine.

Pickups and amplification

Electric guitar pickups are magnets, so they need strings made from magnetic metal. Nylon strings won’t work with them. Acoustic-electric classical guitars use a piezo pickup under the saddle instead, which senses vibration rather than magnetism. Steel-string acoustic-electrics can use either type, so check what is fitted before buying strings.

Which should you choose?

Ask yourself what music you want to play:

• Classical, flamenco, bossa nova or soft fingerstyle: a nylon-string classical guitar.
• Strummed songs in folk, pop, country or singer-songwriter styles: a steel-string acoustic.
• Rock, blues, metal or anything with effects: an electric guitar with steel strings.

If you’re undecided, think about the songs you listen to most. Our comparison of electric vs acoustic guitars and our list of the best guitars for beginners can help you narrow it down. Many teachers start younger children on nylon-string guitars because they are gentle on fingers, but adults can start on whichever type matches their goals.

Care and changing

Both types last longer if you wipe them with a dry cloth after playing to remove sweat and oils. Steel strings eventually corrode and lose their brightness; nylon strings lose their clarity and the wound basses can start to sound dull. Change them when they sound dead, look discolored or won’t stay in tune.

New nylon strings stretch for longer than steel strings, so expect to retune frequently for the first few days. Our guide on how to tune a guitar explains how to keep up. For gauges, materials and coatings in more detail, see how to choose guitar strings.

Frequently asked questions

Are nylon strings easier for beginners?

They are softer on the fingertips, which helps in the first weeks. But the wider neck of a classical guitar can make some chords harder, so the best choice still depends on the music you want to play.

Can I put nylon strings on my acoustic guitar?

It is not recommended. They may not fit the nut and bridge and will usually sound weak. Choose a light-gauge steel set instead if you want an easier feel.

Do steel strings damage your fingers?

No. They can be sore at first until calluses form. Lighter gauges, a good setup and short, regular practice sessions all help.

How can I tell what strings my guitar has?

Classical strings are usually tied at the bridge, and the trebles look like clear or colored plastic. Steel strings are all metal and end in a ball or bridge pins.

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