{"product_id":"bobbin-case-for-20u-zig-zag-sewing-machines-nbsp-541678nbl-universal","title":"Bobbin Case for 20U Zig-Zag Sewing Machines #541678NBL Universal","description":"\u003c!-- JMJ HTML Product Description --\u003e\n\u003ch2 style=\"margin-bottom: 10px;\"\u003eBobbin Case for 20U Zig-Zag Sewing Machines  #541678NBL Universal\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 12px; font-weight: 500;\"\u003eL-Size Bobbin Case • NBL No-Back-Lash System • 21 mm Bobbin Diameter • Industrial Zig-Zag \u0026amp; Compatible Embroidery Machines\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eThe \u003cstrong\u003eBobbin Case #541678NBL\u003c\/strong\u003e is an \u003cstrong\u003eL-size No-Back-Lash (NBL) bobbin case\u003c\/strong\u003e designed for compatible SINGER® 20U series zig-zag sewing machines and other industrial sewing and embroidery machines that use L-size bobbins.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eThis bobbin case is equipped with an integrated \u003cstrong\u003ebrake spring\u003c\/strong\u003e that applies light, continuous pressure to the bobbin. This helps control bobbin momentum when the sewing machine starts and stops, allowing the bobbin to stop rotating faster and helping reduce excess thread unwinding, tangling, and inconsistent bobbin thread control.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eDesigned for bobbins with an approximate \u003cstrong\u003e21 mm diameter\u003c\/strong\u003e, the #541678NBL is a practical replacement for compatible industrial zig-zag machines as well as selected commercial embroidery machines using the same L-size bobbin system.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"margin-bottom: 8px;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 16px; padding-left: 18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 541678NBL.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-Size Bobbin Case:\u003c\/strong\u003e Designed for compatible machines using L-size bobbins.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e21 mm Bobbin Diameter:\u003c\/strong\u003e Designed for compatible bobbins measuring approximately 21 mm in diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNBL — No-Back-Lash Design:\u003c\/strong\u003e Helps control unwanted bobbin rotation during rapid machine starts and stops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Brake Spring:\u003c\/strong\u003e Applies light pressure to the bobbin to help control momentum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Thread Control:\u003c\/strong\u003e Helps reduce excessive bobbin thread unwinding and tangling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZig-Zag Machine Compatibility:\u003c\/strong\u003e Designed for compatible SINGER® 20U series and comparable machines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmbroidery Machine Applications:\u003c\/strong\u003e Also fits selected commercial embroidery machines using compatible L-size bobbins.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3 style=\"margin-bottom: 8px;\"\u003eCompatible Machines\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 10px;\"\u003eThe following is a partial compatibility list. Always verify your exact machine model and bobbin system before ordering.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 16px; padding-left: 18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSINGER®:\u003c\/strong\u003e 20U, P20U33, P20U143\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlphasew:\u003c\/strong\u003e P20U33-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArtisan:\u003c\/strong\u003e 20-3, 20-53, 20U-143\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarudan:\u003c\/strong\u003e BEAM, BEL, BELL, BEM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrother®:\u003c\/strong\u003e B651, B652, TZ1, XL622, XL702, XL703, XL2005, XL4001, XL5001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHappy:\u003c\/strong\u003e HCM, HM4, HMF, HMS, J-4, J-7, J-8, K-4, K-7, K-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeistergram:\u003c\/strong\u003e M100, M600, M700\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3 style=\"margin-bottom: 8px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-bottom: 16px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003e541678NBL\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eSewing Machine Bobbin Case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eBobbin Class \/ Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eL-Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eCompatible Bobbin Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eApprox. 21 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eBobbin Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eNBL — No-Back-Lash\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eBrake Spring\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003ePrimary Machine Application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eUniversal 20U Series Zig-Zag Sewing Machines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eAdditional Application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eCompatible Industrial \u0026amp; Embroidery Machines Using L-Size Bobbins\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e1 Bobbin Case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border-bottom: 1px solid #ddd;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3 style=\"margin-bottom: 8px;\"\u003eHow the NBL System Works\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eDuring rapid sewing, the bobbin can continue spinning momentarily after the machine stops because of rotational momentum. The \u003cstrong\u003eNo-Back-Lash brake spring\u003c\/strong\u003e applies controlled pressure to the bobbin, helping it stop more quickly. This reduces unnecessary thread unwinding inside the bobbin case and helps prevent loose thread and tangling during repeated start-and-stop sewing operations.\u003c\/p\u003e\n\u003chr\u003e\n\u003cdiv style=\"margin: 18px 0; padding: 14px 16px; border-left: 5px solid #f97316; background: #fff7ed; border-radius: 6px;\"\u003e\n\u003cstrong style=\"color: #f97316; font-size: 16px;\"\u003e ⚠️ Compatibility Notice \u003c\/strong\u003e\n\u003cp style=\"margin: 8px 0 0;\"\u003eAlways verify your sewing machine model and subclass before ordering. Part numbers and machine compatibility are provided for reference only. \u003cstrong\u003eJMJ Sewing Machines\u003c\/strong\u003e is not responsible for purchases made without confirming compatibility with your specific machine. \u003cstrong\u003eAll replacement parts sales are final.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003eThe \u003cstrong\u003eBobbin Case #541678NBL\u003c\/strong\u003e provides an L-size No-Back-Lash solution for compatible Universal 20U zig-zag machines and selected industrial and embroidery machines, helping improve bobbin control and reduce unwanted thread unwinding during start-and-stop sewing operations.\u003c\/p\u003e","brand":"UNIVERSAL®","offers":[{"title":"Default Title","offer_id":53846284206374,"sku":null,"price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0969\/5825\/1302\/files\/ChatGPTImage9sept2026_03_11_07p.m..png?v=1788981103","url":"https:\/\/jmjsewingmachines.com\/products\/bobbin-case-for-20u-zig-zag-sewing-machines-nbsp-541678nbl-universal","provider":"JMJ SEWING MACHINES","version":"1.0","type":"link"}