blanket stitch

A blanket stitch is a hand or machine stitch that wraps thread around the edge of fabric to both seal it and reinforce it against fraying. The needle passes through the fabric near the edge, then the thread loops under the needle point before being pulled tight, creating a series of perpendicular loops that sit along the fabric perimeter. Each stitch locks the previous one in place, building a continuous chain that catches raw fibers and holds them secure.

The stitch works on any woven or knit fabric, though it is most common on blankets, felt, felt appliqué, and nonwoven materials where the raw edge would otherwise unravel or shed. On wool blankets especially, it serves a practical purpose: preventing the edge from matting and deteriorating with washing and use. Industrial blanket stitching machines run at 3,000 to 5,000 stitches per minute and can handle pile fabrics up to 20 mm thick without dropping stitches or binding up.

The stitch depth typically ranges from 1/8 inch to 1/4 inch depending on the fabric weight and the desired appearance. Thicker blankets and heavy felts need deeper penetration to catch all the fibers; lighter fabrics need less. Thread tension is critical: too loose and the stitch fails to lock; too tight and it puckers the edge or breaks the thread. Most industrial machines include tension governors to hold tension within a few grams across long production runs.

Distinction from the buttonhole stitch

The blanket stitch and the buttonhole stitch are nearly identical in structure, but blanket stitching is worked along an edge (not around a hole) and sits slightly further from the fold, typically 1/8 inch away. Buttonhole stitches are worked tightly packed around a cut opening to prevent it from enlarging. A blanket stitch can have wider spacing between loops without loss of function.

This stitch appears in both decorative and utilitarian contexts. Mass-produced blankets often omit it entirely in favor of serging or binding, which are faster and cheaper. Heirloom blankets, wool throws, and items marketed as finished goods often receive a blanket stitch as a sign of quality and durability. Commercial operations use dedicated blanket-edge folders and stitchers that feed, fold, and seam the edge in one pass.