Waxed thread
Wax thread is typically used for hand sewing. Waxing makes regular thread stiffer, more water and mildew resistant, and less stretchy. The stitches to stand out or become a focal point. Using a heavier thread size achieves this goal, because stitch visibility increases with thread size. But, there are trade offs:
The material being sewn costs far more than the thread. If the thread is too thick, the material will tear while the stitches remain in tact. Heavier sizes require larger needles that make larger holes in fabric or leather. Also, pushing the needle through the material is harder. Both good stitches and bad stitches stand out. The margin for error increases as thread size increases.
Waxed Thread Size Conventions
The commercial sizes listed are approximate. They are based on the thicknesses of our other commercial threads. Over the last decade or so, millimeters (mm) have become the most popular way of sizing.
Nylon thread
Use nylon thread for sewing almost anything that requires strength and durability. Nylon thread is strong, easy to use, and a great choice for sewing fabric, leather, canvas, and vinyl. We sell it in about 100 colors and in eleven thickness sizes that range from hair-thin to cord-like.