This complete thread tension rebuild kit (part # 43946-kit) is specifically designed for Singer Industrial Model 31 series sewing machines. This kit provides all the essential components to restore proper upper thread tension on these heavy-duty industrial machines.

Kit Includes:

• Check spring (tension release spring)
• Beehive spring
• Two tension discs
• Thumb nut

Specifications:

• Part Number: 43946-kit
• Type: Replacement (aftermarket)
• Designed for Singer Industrial Model 31 series machines

Compatibility:

Fits Singer Industrial models: 31-15, 31-17, 31-18, 31-19, 31-20, and 31-29