12.9 grade of track bolt and nut,HRC38-42 8H7504---6S3419,4K7038---7K2017,7H3597---1M1408, ... .9,12.9 class of track bolt and nut,plow bolt and nut,segment bolt with nut,wheel bolt and nut.Also we could ... sample. Except these fastener,we also can produce pins and locks,bushes for Cat,Komatsu,ESCO,JCB....If you want to ...