Sewing a cylinder means joining two pieces of fabric into a tube shape, usually by stitching a seam along the length and closing the ends
A cylinder is one of the most common shapes you will make in sewing — it is the foundation for sleeves, pant legs, pillows, and stuffed toys. The basic method is straightforward: you fold fabric in half lengthwise with right sides together, stitch a straight seam down the length, and then close or finish the ends depending on what you are making. The main challenge is keeping the seam straight and even, especially if the fabric is stretchy or slippery.
The process changes slightly depending on whether you are sewing a closed tube (like a pillow cover) or an open one (like a sleeve that will attach to a garment). Both start the same way, but the finishing step is different. This guide covers the standard method for a basic cylinder, then shows you how to adapt it for different projects.
Key Takeaways
- Fold your fabric in half lengthwise with right sides facing each other, then stitch a straight seam down the length using a standard straight stitch.
- Press the seam flat after stitching to make it lie smoothly, then turn the tube right-side out if you want the seam hidden inside.
- For a closed cylinder, stitch both ends shut by hand or machine; for an open one, leave the ends raw or finish them with binding or a rolled hem.
- Use pins or a fabric pencil to mark your seam line before stitching if your fabric is slippery or if you need the seam to be in a specific location.
- Test your stitch length and tension on scrap fabric first, especially if you are working with knit, stretch, or delicate material.
Preparing your fabric and marking the seam line
Start by cutting a rectangle of fabric to the size you need. The length of the rectangle will become the length of your cylinder, and the width will wrap around to form the circumference. Lay the fabric flat on your work surface with the right side (the side you want to show) facing down.
Fold the rectangle in half lengthwise so the two long edges meet and the right sides are facing each other. This is called "right sides together." Use pins to hold the fold in place, spacing them about 4 inches apart along the length. If your fabric is slippery (like satin or silk), use more pins or use a fabric pencil to draw a light line parallel to the edge where you plan to stitch — usually 1/2 inch or 5/8 inch from the raw edge, depending on your seam allowance.
Check that the edges are aligned evenly before you stitch. Uneven edges will create a twisted or lopsided cylinder. If you are working with stretchy fabric like jersey or knit, consider using a walking foot on your machine to feed the fabric evenly and prevent puckering.
Stitching the seam straight and even
Thread your machine and set it to a straight stitch with a stitch length of 2.0 to 2.5 millimeters — this is standard for most woven fabrics. If you are sewing knit or stretch fabric, use a stitch length of 2.0 or slightly shorter, and consider using a ballpoint or stretch needle to prevent skipped stitches.
Position the fabric under the presser foot so the raw edges line up with your chosen seam allowance guide (usually the 1/2-inch or 5/8-inch line on the needle plate). Lower the presser foot and begin stitching slowly, keeping steady pressure on the fabric. Do not pull or push the fabric — let the feed dogs move it. Stitch all the way to the end of the seam, then backstitch a few stitches to lock the thread.
Remove the fabric from the machine and trim the thread tails. Inspect the seam: it should be straight, with even stitches and no puckering or skipped stitches. If the seam is crooked or loose, you can carefully remove the stitches with a seam ripper and try again.
Pressing and turning the cylinder right-side out
Place the sewn cylinder on your ironing board with the seam facing up. Set your iron to the appropriate heat for your fabric (check the fiber content on your pattern or fabric label). Press the seam flat, moving the iron along the length of the seam. This flattens the stitches and makes the seam lie smoothly.
If you want the seam hidden on the inside of the finished cylinder, turn it right-side out now. Reach into one end of the tube and grasp the opposite end from the inside, then pull gently to turn the fabric through. The right sides will now face outward and the seam will be on the inside. Press the cylinder again, this time from the outside, to set the shape.
If you are making a project where the seam will be visible on the outside (like a decorative pillow with a contrasting thread), you can skip this step and leave the cylinder as is.
Closing the ends for a finished cylinder
If you are making a closed shape like a pillow or a stuffed toy, you will need to close both ends. One method is to fold the raw edges at each end inward by 1/2 inch, press them, and then stitch them closed by hand using a ladder stitch (also called a slip stitch). This creates an invisible seam on the outside.
To ladder stitch, thread a needle and knot the end. Bring the needle out through the fold of one end, then insert it directly across into the fold of the other end. Slide the needle inside the fold for about 1/4 inch, then bring it back out and cross over to the opposite side. Repeat this back-and-forth motion, pulling gently every few stitches to close the gap. When you reach the end, knot the thread inside the fold and trim.
Alternatively, you can machine-stitch the ends closed before turning the cylinder right-side out. Fold each end inward, pin them together, and stitch around the perimeter using a straight stitch. This is faster but will leave a visible seam on the inside.
Finishing open ends for sleeves and tubes
If your cylinder will be attached to another piece (like a sleeve sewn onto a bodice) or will remain open, you have several finishing options. The simplest is to leave the raw edges as they are if they will be enclosed in a seam. If the edges will be visible, you can finish them with a rolled hem, bias binding, or a narrow zigzag stitch.
For a rolled hem, fold the raw edge inward by 1/4 inch and press, then fold it inward again by another 1/4 inch and press. Stitch close to the inner fold using a straight stitch. This creates a neat, narrow hem that does not add bulk.
For bias binding, cut or purchase bias tape wide enough to wrap around the raw edge. Open the binding, align one edge with the raw edge of the cylinder, and stitch along the fold line. Fold the binding to the inside and stitch it down by hand or machine. This method works well for curved or stretchy edges.
Troubleshooting common problems
If your seam is crooked or wavy, the fabric may have been pulled unevenly during stitching, or your stitch tension may be too tight. Check that you are not pulling the fabric and that your tension dial is set to the middle position (usually marked as 5 on a scale of 1 to 10). If the problem persists, test your tension on scrap fabric and adjust as needed.
If the cylinder is twisted or lopsided, the two long edges of your rectangle were not aligned evenly when you folded and pinned. Measure the width of your rectangle at several points along the length to make sure it is consistent. If you are working with a stretchy fabric, consider cutting the rectangle with the stretch running along the width (around the circumference) rather than the length, as this will make the cylinder easier to handle.
If the seam puckers or gathers, your stitch length may be too short, your tension too tight, or you may be using the wrong needle for your fabric. Knit and stretch fabrics need a ballpoint or stretch needle and a slightly longer stitch. Lightweight fabrics may need a smaller needle (size 60/8 or 70/10) and a shorter stitch.
Frequently Asked Questions
What is the difference between a seam allowance of 1/2 inch and 5/8 inch?
The seam allowance is the distance between the raw edge of the fabric and the stitching line. A 1/2-inch allowance is common in casual sewing and home projects, while 5/8 inch is standard in garment sewing and gives you more room to adjust the fit. For a cylinder, either works — just be consistent so the finished size matches your pattern.
Can I sew a cylinder on a serger instead of a regular sewing machine?
Yes. A serger stitches and finishes the raw edges in one pass, which is faster and creates a professional look. Set your serger to a standard 3-thread or 4-thread stitch, fold and pin your fabric the same way, and stitch the seam. The serger will trim the excess fabric and wrap thread around the edge automatically.
What if my fabric is very stretchy, like swimsuit material?
Use a ballpoint needle, a stretch stitch (if your machine has one), and a walking foot if available. Stretch fabric needs a needle that slides between the fibers rather than piercing them, and a walking foot helps feed the fabric evenly without distortion. Test on scrap fabric first to check for puckering or skipped stitches.
Do I have to turn the cylinder right-side out?
No. Turning it right-side out hides the seam on the inside, which looks neater for most projects. But if you want the seam visible on the outside (for a decorative effect or a specific design), you can leave it as is. Just make sure the raw edges are finished so they do not fray.
How do I know if my cylinder is the right size?
Measure the circumference (the distance around) by wrapping a measuring tape around the finished cylinder. It should match the measurement in your pattern or the size you intended. If it is too small or too large, you can adjust the seam allowance on your next attempt — moving the seam inward makes the cylinder smaller, and moving it outward makes it larger.