BS 3643-1-2007 ISO metric screw threads Part 1 Principles and basic data.pdf PDF 869.97KB 76页 BS 3643-1-1981 ISO 米制螺纹第一部分：原则与基本数据.pdf PDF 1.22MB 60页 BS 3643-2-2007 ISO metric screw threads Part 2 Specification for selected limits of size.pdf PDF 575.13KB 48页 BS 3643-2-1981 ISO 米制螺纹第二部分：规格与极限尺寸.pdf PDF 867.5KB 46页
