... 20 years experience in special fastener Name: hex nut with internal thread and castle screw Ability for the material of this kind ... of nut: Grade3.6,4.6,4.8,5.6,6 ... .8,8.8,9.8,10.9,12.9,etcCarbon steelGr ... our own way to supply youthe high quality products with lowest price and delivery on time as we can.We have ...