National standard GB: GB / T 6177.1 International ISO: ISO 4161 Standard DIN: DIN EN 1661 American standard ANSI / ASME: ANSI / ASME B 18.2.4.4M European standard EN: EN 1661 NF, France: NF E 25-406 Flange nut and the general hexagonal nut size is basically the same as the thread specifications, but compared with the hexagonal nut, it is the gasket and nut are integrated, and there are anti-skid tooth lines below, which increases the contact between the surface area of the nut and the workpiece, compared with the combination of ordinary nut and gasket, more firm and more tension.1. Our products are exported worldwide. Our customers are always satisfied with our reliable quality, customer-oriented services and competitive prices. Our mission is "to continue to earn your loyalty by dedicating our efforts to the constant improvement of our products and services in order to ensure the satisfaction of our end-users, customers, employees, suppliers and the worldwide communities in which we cooperate". 2. We have established long-term, stable and good business relationships with many manufacturers and wholesalers around the world. Currently, we are looking forward to even greater cooperation with overseas customers based on mutual benefits. Please feel free to contact us for more details. 3. We have many years of experience in production and export business. We always develop and design kinds of novel products to meet the market demand and help the guests continuously by updating our products. We are specialized manufacturer and exporter in China. Wherever you are, please join us, and together we will shape a bright future in your business field!