Steel Top-Lock Distorted-Thread Locknuts（不同强度）

McMaster-CARR Founded in 1901, mcmaster-carr is the leading distributor of industrial products in the United States, with more than 555000 products, including mechanical transmission parts, fasteners, seals, pipe fittings, electronic components, fluid control, pressure control and other hardware accessories. Its products are widely used in aviation, chemical, food, medical and other industries. The company is headquartered in Elmhurst, Illinois. -- PPWFA, have new cooperation with McMaster on a full range of products and supply chain, committed to providing high-precision mechanical components for the increasingly powerful made in China.