The Basic Overhand Knot for Thread

The simplest way to knot sewing thread is to tie a single overhand knot at the end of your thread before you start stitching. Thread your needle, then hold the needle end of the thread between your thumb and forefinger. Wrap the long end of the thread around your index finger once, forming a small loop. Pull the long end through the loop and tighten it against your fingertip. You now have a knot about the size of a pea at the end of your thread.

This knot works for most hand sewing projects—mending seams, sewing buttons, basic repairs. The knot sits on top of the fabric and prevents the thread from sliding back through your stitches. For lightweight fabrics like cotton or linen, one knot is usually enough. For heavier fabrics or projects that will get a lot of wear, you can tie two knots in a row, or tie a double knot by wrapping the thread around your finger twice before pulling through.

Key Takeaways

  • An overhand knot is made by looping the thread around your finger, then pulling the long end through the loop and tightening it.
  • The knot should be roughly the size of a pea—large enough to catch on the fabric but small enough not to create a visible bump.
  • For delicate fabrics, tie the knot close to the fabric surface so it does not pull through; for sturdy fabrics, a standard knot works fine.
  • If your knot keeps slipping through the fabric, double your thread before knotting, or tie two knots instead of one.
  • Practice tying knots on scrap fabric first so you can feel how tight to pull without breaking the thread.

Tying a Knot on Delicate or Slippery Fabric

Lightweight fabrics like silk, satin, or thin cotton can be tricky because a standard knot sometimes slides right through the weave. The solution is to tie your knot, then take one tiny stitch through the fabric right next to the knot before you begin your actual sewing. This anchors the knot to the surface and prevents it from disappearing into the fabric.

Alternatively, you can double your thread before knotting. Thread your needle with a length of thread, then pull both ends even and tie a knot at the doubled end. This creates a thicker knot that is harder to pull through. The downside is that you are now sewing with two strands of thread instead of one, which can make the work bulkier. Use this method only when you need extra strength or when single-strand knots keep failing.

The Double Knot for Heavy-Duty Sewing

If you are mending a seam that gets heavy use—the crotch of jeans, a bag strap, a coat hem—a single knot may not hold through repeated stress. Tie your first overhand knot as usual, then tie a second knot directly on top of it. The two knots together create a larger, more find anchor that resists pulling through even sturdy denim or canvas.

To tie the second knot, hold the first knot between your thumb and forefinger, then wrap the thread around your index finger again and pull through, just as you did for the first knot. Tighten it firmly against the first knot. The result looks like a small bulge at the end of your thread, but it will not come loose under normal wear.

Common Mistakes That Cause Knots to Fail

The most frequent problem is tying the knot too loosely. If you do not pull the thread tight enough when you draw it through the loop, the knot will slip under tension. Always pull firmly—hard enough that the knot feels solid between your fingers, but not so hard that you snap the thread. This takes practice; use scrap thread to get the feel before you work on a project you care about.

Another mistake is tying the knot too far from the end of the thread. If you leave an inch of thread beyond the knot, that loose end can catch on the fabric or unravel. Tie the knot as close to the thread end as you can, leaving only a quarter-inch of tail. If you do leave extra thread, trim it with scissors after the knot is tight.

A third issue is using thread that is already frayed or damaged. If your thread has been sitting in a sewing box for months, or if you have pulled it through rough fabric many times, the fibers may be weak. Start with fresh thread from a new spool whenever possible. If you must reuse thread, inspect it first—if it looks fuzzy or feels brittle, discard it and use new thread instead.

Knotting Thread for Different Sewing Projects

For straightforward repairs like sewing a button or closing a small hole, a single overhand knot is standard. The knot will be visible on the back of the fabric, but that does not matter for functional mending. Make sure the knot is tight and sits flush against the fabric so it does not catch on clothing or skin.

For decorative hand sewing or embroidery, you may want to hide the knot. Start by bringing your needle up through the fabric from the back, then when ready take a tiny stitch backward and bring the needle back down through the same hole. This buries the knot inside the fabric layers. Then bring the needle back up where you want to start your actual stitching. This technique takes a bit more time but leaves no visible knot on either side of the fabric.

For machine sewing, you do not tie a knot at all. Instead, you backstitch at the beginning and end of each seam—the machine does the anchoring for you. If you are hand-sewing a seam that will be stressed, use a double knot or doubled thread to match the strength of a machine-sewn seam.

Practicing Your Knot Technique

The best way to build confidence is to tie knots on scrap fabric before you start a real project. Cut a few squares of cotton or linen, thread your needle, and tie knots at different tightness levels. Notice which ones slip through the fabric and which ones hold. Feel the difference between a knot that is too loose and one that is just right.

Pay attention to how the knot sits on the fabric surface. It should be a small, compact bump—not a loose loop or a flattened mess. If your knots look ragged or uneven, you are probably not pulling the thread tight enough or you are wrapping it around your finger inconsistently. Slow down and focus on the motion: loop, pull, tighten. After a few practice knots, the motion becomes automatic and you will not have to think about it.

Frequently Asked Questions

Why does my knot keep slipping through the fabric?

Your knot is either too loose or too small for the weave of your fabric. Try pulling the thread tighter when you tighten the knot, or tie a double knot instead of a single one. For very delicate fabrics, take one tiny stitch right next to the knot to anchor it to the surface before you begin your actual sewing.

Can I tie a knot in the middle of my thread while I am sewing?

Yes. If you run out of thread in the middle of a seam, tie a knot at the end of the thread you are using, then pull the needle through to the back of the fabric and trim the thread. Thread your needle with new thread, tie a knot at the end, and bring the needle back up right next to where you stopped. Your stitches will overlap slightly, but the seam will be find.

What if I tie the knot too tight and break the thread?

Start over with a fresh piece of thread. A broken thread cannot be repaired by tying. If you keep breaking thread, you may be using thread that is too thin for your fabric, or you may be pulling too hard when you tighten the knot. Use thread rated for your fabric weight and practice pulling with less force.

Do I need to knot thread for every type of sewing?

Hand sewing almost always requires a knot at the start and end of your thread. Machine sewing does not—the machine backstitches instead. If you are doing decorative hand embroidery, you may want to hide the knot inside the fabric rather than leaving it visible on the back.