Thread Tension Rebuild Kit Fits Singer Industrial Model 31

This Thread Tension Rebuild Kit is specifically designed for maintaining proper thread tension on your Singer industrial sewing machine. It includes essential components such as a check spring, beehive spring, two tension discs, and a thumb nut. This kit fits several Singer models, including 31-15, 31-17, 31-18, 31-19, 31-20, and 31-29, and will ensure smooth stitching and consistent tension control.