How to sew Velcro so it sits flat, does not scratch and survives the first wash? Hook and loop tape looks simple to sew, but it is thicker and stiffer than most fabrics, and the hooks love to catch the thread and the presser foot. With the right needle, thread and a few small tricks, though, you will get a clean, strong seam first time. Here is the complete step-by-step guide for domestic and industrial sewing machines.
What you need
- Sew-on hook and loop tape – not self-adhesive (we explain why below).
- A 90/14 or 100/16 needle – universal or denim. For thicker tape or several fabric layers, go with 100/16.
- Polyester thread – strong and resistant to abrasion and washing. Cotton thread wears quickly against the hooks.
- Clips or a fabric glue stick – pins struggle to pierce the stiff tape and push it out of line.
- Sharp-pointed scissors for rounding the corners.
- Optional – a walking foot or Teflon foot for even feeding.
Step by step
- Cut the tape. Measure the length you need on both the hook and loop sides and cut them identically.
- Round the corners. Trim a small curve on every corner, especially on the stiff hook side. Sharp corners scratch skin and snag knits.
- Decide which side goes where. The soft loop side goes on the part that touches the body; the stiff hook side goes on the flap that closes over it.
- Position and secure. Place the tape and hold it with clips or a thin layer of glue stick. Close the flap to check that both sides line up.
- Set the machine. Straight stitch, length around 2.5–3 mm – the equivalent of 8–10 stitches per inch. A shorter stitch perforates the tape like a postage stamp and it can tear along the seam.
- Stitch the perimeter. Sew 1.5–3 mm in from the tape edge, slowly, pivoting at the corners with the needle down. Complete a full box stitch around the tape.
- Reinforce. For tapes under load – backpack flaps, straps – add a diagonal cross (X) inside the box.
- Secure the threads. Backstitch a few stitches at the start and end, or pull the threads to the wrong side and tie them off.
Tip: start stitching in the middle of a long side, not at a corner. The foot has support, the tape does not slip, and the overlap is almost invisible.
How far from the edge, and how big a piece
The tape is usually sewn 3–5 mm in from the edge of the flap or cuff, so it does not show from the front when closed. If the flap has a hem or binding, keep the tape clear of the hem seam – the double thickness strains the needle. For small closures a 2–3 cm piece is plenty; on long flaps, several short pieces work better than one continuous strip, as the flap stays flexible and is easier to open. Stitch both sides as mirror images so they line up exactly when closed.
Match the thread to the fabric if the stitching shows on the right side, and to the tape if it is hidden. With white tape on dark fabric, a common trick is fabric-coloured top thread and tape-coloured bobbin thread.
Sewing onto knits
Knit fabrics stretch; the tape does not. Sew it on with a straight stitch and the thread will snap the first time the fabric is stretched. Use a narrow zigzag instead – about 1.5–2 mm wide and 2–2.5 mm long. Add a light fusible interfacing on the reverse to stabilise the area so the fabric does not stretch under the foot.
Why not to sew adhesive Velcro
Self-adhesive tape has a layer of glue on the back. As you sew, friction heats the needle and the glue builds up on it. The result is skipped stitches, broken thread and sometimes thread stuck to the needle plate. If you really must sew it, use a Teflon-coated needle, sew slowly and clean the needle often with rubbing alcohol on a cotton pad (with the machine switched off). The better answer is simply to buy sew-on tape.
Industrial sewing
In a factory, hook and loop is sewn on a lockstitch machine with a walking foot, or on a programmable bar-tack or pattern-sewing machine. For production runs the thread is polyester of a suitable weight, and the position is marked with a template so every piece is identical. In the tech pack, specify tape width and colour, which side carries the hooks, stitch distance from the edge and the type of reinforcement.
Troubleshooting
| Problem | Cause | Fix |
|---|---|---|
| Skipped stitches | Thin or blunt needle; adhesive | New 100/16 needle; use sew-on tape |
| Thread breaks | Thread too fine, or cotton | Polyester thread, lower speed |
| Tape slides | Stiff surface, slippery fabric | Glue stick, walking foot |
| Fabric puckers | Knit without a stabiliser | Interfacing underneath, narrow zigzag |
| Tape tears along the seam | Stitch too short | Lengthen stitch to 2.5–3 mm |
| Corners scratch | Sharp corners | Round them before sewing |
Care after sewing
Close the fastener before washing – open hooks collect lint and hair and snag other garments. Over time, clear built-up fibres with a brush or a needle to restore the grip.
Threads and trims from Bul-tex
For sewing hook and loop tape, choose strong polyester sewing threads in a matching colour. Our accessories collection has cord locks, aglets, rings and adjusters for bags and sportswear, and for cord-free childrenswear take a look at our snap fasteners. Bul-tex manufactures and supplies garment trims and takes orders from brands – contact us if you are preparing a production run. For the different types of hook and loop tape, see our accessories articles.
