{"product_id":"premium-replacement-check-spring-43946-8511-for-singer-31-331k-sewing-machine","title":"Check Spring 43946=8511 for Singer 31, 331K Sewing Machine","description":"\u003cp\u003eCheck Spring (Part #43946 \/ 8511) – For Singer 31 \u0026amp; 331K\u003cbr\u003e\nEnsure perfect tension and precise loop formation with the Check Spring (Part #43946 \/ 8511). This critical tension component is engineered specifically for Singer 31 and 331K industrial machines. It acts as the buffer for the upper thread, taking up the slack during the needle's descent and ensuring the thread is controlled at the exact moment the hook catches the loop.\u003c\/p\u003e\n\n\u003cp\u003eKey Performance Features\u003cbr\u003e\nHigh-Resilience Spring Steel: Manufactured from premium-grade tempered steel, providing the perfect balance of flexibility and \"snap-back\" required for high-speed industrial sewing.\u003c\/p\u003e\n\n\u003cp\u003eConsistent Tension Control: Regulates thread slack to prevent \"bird-nesting\" and looping on the underside of the fabric.\u003c\/p\u003e\n\n\u003cp\u003ePrecision Coil Geometry: Designed to fit perfectly into the tension assembly of the Singer 31\/331K series, ensuring smooth operation without binding or sticking.\u003c\/p\u003e\n\n\u003cp\u003eFatigue Resistant: Built to withstand millions of cycles, maintaining its tension strength even under the constant stress of heavy-duty production.\u003c\/p\u003e","brand":"Universal","offers":[{"title":"Default Title","offer_id":48309660156153,"sku":"43946","price":0.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/6733\/3113\/files\/Singer_Premium_Replacement_Parts.jpg?v=1776585850","url":"https:\/\/empenzoamericas.com\/products\/premium-replacement-check-spring-43946-8511-for-singer-31-331k-sewing-machine","provider":"Empenzo Americas Corp.","version":"1.0","type":"link"}