标准:
标准库
(7)
HG/T 20634-2009Hexagon nuts for steel pipe with flange
HG/T 20613-2009Hexagon bolts for pipe flange
HG/T 20613-2009Bolting for use with stral pipe falanges-Hexagon nuts,style 1
HG/T 20613-2009Bolting for use with stral pipe falanges-Hexagon nuts,style 1,with fine pitch thread
HG/T 20613-2009Bolting for use with stral pipe falanges-Hexagon nuts,style 2
HG/T 20613-2009Bolting for use with stral pipe falanges-Hexagon nuts,style 2,with fine pitch thread
HG/T 20634-2009Hexagon nuts-Style 1