- the clever way Replacement tension spring for your sewing machine Ensures reliable thread tension Easy to install for quick repairs Precisely manufactured for a perfect fit and fast installation All compatibility and technical details below If you use your sewing machine frequently and intensively, the thread tension spring may lose its elasticity over time. When the thread is no longer held securely under tension, it's time to replace the thread tension spring. Our replacement spring is precisely engineered, easy to install, and built to last using high-quality materials. Restore your sewing machine to optimal performance with this durable thread tension spring. Package includes: 1 x Thread tension spring Technical specifications: Spring arm width: 9.5 mm Coil diameter: 10.5 mm Wire thickness: 0.6 mm Total length: 30 mm Material: Plastic Color: Black Weight: 1 g Compatible with the following models (use Ctrl + F or Cmd + F to search): Singer 212W, Pfaff 141, 145, 333, 335, 471, 474, 491, 545, 1021, 1022, 1200, 1243, 1245, 1247, 1263, 1200-1 Replaces original parts: Seiko 10689 / Mitsubishi MP60A0187, MP60A1187 / 375/P141 / Brother 151011001 / Juki B3128051-000, J1027-0A / Highlead H4713C8001 / Pfaff 9101002305000 / Singer 267368 - the clever way High-quality replacement parts and accessories for long-lasting performance of your electrical devices.