BS 4933-1973 Specification for ISO metric black cup and countersunk head bolts and screws with hexagBS 4933-1973 Specification for ISO metric black cup and countersunk head bolts and screws with hexagon nuts
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。