Sewing Machine Bobbins: Match the Class, Material, and Case Before You Buy
Sewing machine bobbins should be matched to the exact machine before you compare price, package quantity, material, or appearance. Class, profile, height, diameter, center bore, material, and the machine maker’s part number can all matter, and similar-looking bobbins are not automatically interchangeable. Use the exact model manual or manufacturer compatibility listing as the strongest evidence,