Sewing Machine Tension Springs | 4-Pack Replacement Set | Compatible with Singer 201, 221, 222, 301

Restore precise thread control to your vintage Singer sewing machine with these 4pcs Sewing Machine Upper Thread Tension Springs. Designed as exact replacements for part numbers #66774 and 125314, these springs are engineered to deliver consistent tension for flawless stitch formation, eliminating skipped stitches and thread breakage during operation. Features and Benefits - Precision-engineered spring tension - Ensures uniform pressure on the upper thread for balanced, professional-quality stitches on every project. - High-carbon steel construction - Provides superior durability and long-lasting elasticity, resisting fatigue and deformation from repeated use. - Exact OEM specification match - Guarantees perfect fit and function for seamless integration into your machine's tension assembly. - Set of four replacement springs - Offers excellent value and ensures you have spares on hand for future maintenance needs. Applications - Routine sewing machine maintenance - Replace worn or broken tension springs to restore your machine's original performance and stitch quality. - Vintage Singer machine restoration - Authentically repair and service classic Singer 201, 221, 222, and 301 models with correct factory parts. - Troubleshooting stitch inconsistency - Address common issues like loose loops on the fabric underside or uneven thread tension. - Professional and home workshop use - A reliable, cost-effective solution for technicians and enthusiasts to keep essential equipment in optimal condition. Note Please verify your sewing machine model and the specific part numbers (#66774, 125314) from your existing tension assembly before purchase to ensure compatibility.