Parallel screw threads of whitworth form (BSW and BSF) and associated gauges and gauging practice
whitworth型平行螺纹（BSW和BSF）及相关量规和测量规程

1987-10-05

Screw gauge limits and tolerances. Specification for gauges for screw threads of Whitworth and B.A. forms
螺钉规限值和公差 Whitworth和B.A.型螺纹量规规范

2007-11-30

Specification for machine screw nuts, pressed type (B.A. and Whitworth form threads)
压制型机用螺钉螺母规范（B.A.和Whitworth型螺纹）

1957-02-08