... fastener,all of our fastener are made by high grade alloy steel,the surface hardness can reach HRC36-42,tensile strength is 170,000 ... nut,wheel bolt and nut.Also we could produce according to your drawing or sample. Except these fastener,we also can ... Cat,Komatsu,ESCO,JCB....If you want to know more of our products,please feel free to contact with us,we will reply ...