Use a size 16/100 or 18/110 needle for most denim
Denim is tightly woven and thick, so it needs a needle with a stronger shaft than you would use for cotton or linen. A size 16/100 needle works for light to medium denim like chambray or thin jeans fabric. A size 18/110 needle is the standard choice for regular denim and will handle most jeans-weight fabric without breaking or deflecting as it punches through the weave.
If you are working with heavy raw denim or canvas-weight material, move up to a size 20/120. If your needle keeps breaking or bending, or if you see skipped stitches, the needle is too small for the fabric weight. If the needle leaves large holes or the fabric puckers around the seam, the needle is too large.
The needle type also matters. Use a universal needle for general denim sewing, or a denim needle (also called a jeans needle) if your machine has one. Denim needles have a reinforced shaft and a special scarf design that reduces skipped stitches in heavy fabrics. They cost slightly more but last longer in tough material.
Key Takeaways
- Size 16/100 works for lightweight denim; size 18/110 is the standard for regular jeans-weight fabric.
- Heavy raw denim and canvas require a size 20/120 needle to avoid breaking or deflecting.
- A denim or jeans needle has a reinforced shaft and reduces skipped stitches better than a universal needle in thick fabric.
- Replace your needle after every project or every 8 hours of sewing, because a dull needle will skip stitches and damage the weave.
How needle size and fabric weight work together
Needle sizes are numbered in two ways: the American system (10, 12, 14, 16, 18) and the European system (60, 70, 80, 90, 100, 110, 120). Most packages show both. The higher the number, the thicker and stronger the needle shaft. A size 10/60 is thin and flexible; a size 20/120 is thick and rigid.
Denim resists the needle as it enters the fabric. A needle that is too thin will bend or break under the pressure. A needle that is too large will leave visible holes and can damage the fibers. The goal is a needle thick enough to push through without bending, but not so thick that it tears the weave.
Thread weight also affects needle choice. If you are using heavy-duty thread (like topstitching thread) on denim, you may need to go up one needle size to accommodate the thicker thread in the eye. Check your machine manual for the recommended needle size for your thread weight.
Universal needles versus denim needles
A universal needle has a slightly rounded tip and works on most woven and knit fabrics. It is the most common needle type and costs less than specialty needles. For light and medium denim, a universal needle in size 16/100 or 18/110 will work fine.
A denim needle (or jeans needle) has a reinforced shaft, a deeper groove, and a modified scarf. These features help the needle penetrate thick, tightly woven fabric without skipping stitches or bending. If you sew denim regularly, a denim needle will reduce frustration and thread breaks. Brands like Schmetz, Organ, and Singer all make denim needles.
For topstitching denim (the visible decorative stitching on seams and hems), some sewers use a topstitch needle in size 18/110 or 20/120. A topstitch needle has a larger eye and deeper groove to hold thick thread and reduce shredding. This is optional but helpful if you want clean, even topstitching.
When to change your needle
A dull or bent needle is the most common cause of skipped stitches and puckered seams in denim. Replace your needle after every project, or after 8 hours of continuous sewing. If you hit a pin or a seam ripper while sewing, change the needle when ready—even a tiny bend will cause problems.
Signs that your needle needs replacing include skipped stitches, a popping sound as the needle enters the fabric, thread shredding or breaking, and holes or snags in the fabric. Do not try to straighten a bent needle; it will break inside the machine or damage the fabric. Always use a fresh needle.
Store needles in a dry place and keep them in their original package or a needle case. Needles can rust or become dull if exposed to moisture or dust. Buy needles in bulk if you sew denim often—they are inexpensive and you will use them regularly.
Needle size chart for different denim weights
| Denim Type | Needle Size | Needle Type |
|---|---|---|
| Chambray, lightweight denim | 16/100 | Universal |
| Regular jeans weight | 18/110 | Universal or Denim |
| Heavy raw denim, selvedge | 20/120 | Denim |
| Canvas, upholstery weight | 20/120 or 22/130 | Denim or Leather |
| Topstitching on denim | 18/110 or 20/120 | Topstitch |
Thread and tension adjustments for denim
Denim is forgiving with thread choice, but heavy-duty or topstitching thread shows better on seams and hems. If you use topstitching thread, you may need to increase your needle size to 18/110 or 20/120 so the thicker thread feeds smoothly through the needle eye.
Tension often needs adjustment when sewing denim. Start with your machine's default tension and sew a test seam on scrap fabric. If the top thread is loose and loopy on the underside, increase tension slightly. If the bobbin thread is pulling the top thread to the back, decrease tension. Denim's weight can throw off tension, so test before you commit to a garment seam.
Use a fresh bobbin for each project. Old bobbins can have lint buildup or bent edges that cause tension problems. If you are sewing multiple layers of denim (like a hem or a seam allowance), slow your machine speed slightly to give the needle time to penetrate without bending.
Troubleshooting common denim sewing problems
If your needle keeps breaking, the needle is too small for the fabric weight or you are sewing too fast. Slow down and try the next size up. If you are hitting pins or seam rippers, remove them before the needle reaches them.
Skipped stitches usually mean the needle is dull, too small, or not inserted correctly. Replace the needle first. If skips continue, check that the needle is pushed all the way into the needle clamp and facing the right direction (the flat side should face the correct direction for your machine—check your manual).
Puckered seams in denim often come from tension that is too tight or a needle that is too large. Test your tension on scrap fabric and try dropping down one needle size. Puckering can also happen if you are pulling the fabric as you sew; let the feed dogs move the fabric instead.
Frequently Asked Questions
Can I use a size 14 needle for denim?
A size 14/90 needle is too small for most denim and will bend or break under the pressure of the thick weave. It might work for very lightweight chambray or denim blends, but size 16/100 is the minimum for standard denim. If you only have a size 14 on hand, test it on scrap fabric first and watch for bending or skipped stitches.
What is the difference between a denim needle and a jeans needle?
Denim needle and jeans needle are the same thing—different brands use different names. Both have a reinforced shaft and a modified scarf to handle thick, tightly woven fabric. Schmetz calls theirs a denim needle; Organ calls theirs a jeans needle. They perform the same function.
Do I need a special needle for stretch denim?
Stretch denim has elastane or spandex mixed in, which makes it more forgiving than rigid denim. A size 16/100 or 18/110 universal needle works fine for most stretch denim. If the fabric is very stretchy or you are sewing a fitted garment, a ballpoint or stretch needle can reduce skipped stitches, but it is not required.
How many layers of denim can one needle handle?
A size 18/110 or 20/120 needle can sew through two to three layers of regular denim without breaking, as long as the needle is sharp and your machine is in good condition. For four or more layers (like a thick hem), slow your machine speed and consider using a size 20/120 denim needle. If the needle bends or breaks, stop and replace it rather than risk damaging your machine.
Can I use a leather needle for denim?
A leather needle has a cutting point designed to slice through leather without tearing it. It will work on very heavy denim or canvas, but it is not ideal because it cuts fibers rather than pushing them aside. A denim needle is better because it is designed for the weave structure of woven fabric. Save the leather needle for actual leather or suede.