Tension Spring JUKI Heavy-Duty for MO-3900 Series - B3103804000

Replacement Tension Spring for JUKI Sewing Machines

This JUKI tension spring is a replacement sewing machine part designed to help maintain consistent thread tension in compatible machines. It is identified by part number B3103804000 and also cross-references to B31038-04-000, B3103804-000, 144110-101, 41-702, and 201086.

Use this part when you need a dependable replacement for compatible JUKI overlock and related machine models. Proper tension control is essential for balanced stitching, smooth operation, and reliable seam quality, making this a practical maintenance part for repair shops, technicians, and machine owners.

Choose this replacement spring for a straightforward fit on supported JUKI machines when restoring or servicing the tension assembly.