NUT,LONG NUT,HARDWARE NUTS 1.ISO,ANSI,JIS,DIN,BS& non ... .Grade:4.8 ,6.8,8.8,9.8... NUT,LONG NUT,HARDWARE NUTS AND BOLTS . A good non-standard fastenerS ... manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2 ... Enhance the strength of the quality control.6. Certificate:ISO9001-2008 ,And Provide dimensions report,chemical report and other testing ...