BS 6322-3:1992
紧固件公差 螺栓、螺钉和螺母的平垫圈公差规范 螺纹公称直径从 1 毫米到 150 毫米(含) 产品等级 A 和 C
Tolerances for fasteners-Specification for tolerances of plain washers for bolts, screws and nuts with nominal thread diameters from 1 mm up to and including 150 mm. Product grades A and C