BS 4168-1-1981 Hexagon socket screws and wrench keys metric series Part 1 Specification for hexagonBS 4168-1-1981 Hexagon socket screws and wrench keys metric series Part 1 Specification for hexagon socket head cap screws
部份国外标准涉及版权问题,所以全部国外标准于2013年02月,全部删除!相关页面仅提供参考消息。