... than 20 years experience in fastener feild Name:nonstandard hex nut ;nonstandard nut ; hex nut Ability for the material of this kind of ... nut: Grade3.6,4.6,4.8,5.6,6.8, ... ,9.8,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D,Gr.36,Gr.58,1010,1015,1016,1020 ... so that you couldavoid lots of risks. non-standard hex nut