Single needle long arm zig zag sewing machine for extra heavy duty materials. This machine adopting connecting rod for thread take-up and shuttle hook, bottom feed mechanicsm. The machine equipped with bottom feed mechanism, and the top puller feed is for very heavy-weight materials with a stitch length of up to 10mm and a throw width of up to 12mm. With pneumatic foot lifter and pneumatic reverse sewing. Presser foot lift can reach 20mm. Excellent stitch pattern and constantly tight stitch formation, even when sewing with thick threads in heavy weight material. Adopting the large barrel shuttle hook which increased bobbin capacity, even with thick threads. Extra large working space make sewing operation easily on products like sails.