對(duì)應(yīng)標(biāo)準(zhǔn): B18.2.6-2010 結(jié)構(gòu)螺栓用大六角螺母 (ASTM A 563 / ASTM A 194) [Table 3]
材質(zhì):SCM435/SCM440/B7/42CRMOA,8級(jí)以上都可以做