Counting What Holds: The Arithmetic of Stitch Density, Thread Weight, and Seam Longevity
The difference between a seam that survives a decade of wear and one that unravels after a season is rarely visible to the eye—it lives in the numbers behind the stitch. This article examines how stitches-per-inch, thread weight, and fabric structure interact to determine the mechanical load a seam can bear. For makers committed to building durability into their work, understanding this arithmetic is foundational.