Sewing Machine Needles SD1 135x5 are specialty needles optimized for sewing dense fabrics, such as heavy sailcloth. SD1 needles partially cut, and then push the fibers out of the way. These industrial needles also work for fine leather or leather clothing, as the SD1 needles feature a smaller cutting point than the DI needles.

Needle sizes are listed two ways, by size and measurement, so a #12 needle is the same as an 80. For more information on needle and thread choices, see the Thread and Needle Recommendations document.