54SA14-3 type E bolt, the original main engine factory is Northwest Benniu (Ningxia Dibenniu , Northwest Coal Machine Factory), with 54SA14-2 type scraper, is the commonly used E type bolt drawing number on Northwest Benni scraper The total length of 390mm , center distance of 175mm , commonly made of . 4 . 5 No. steel, may be customized according to customer requirements 40Cr material, transfer of heat treatment may be.