推荐回答(3个)
钢管外径(A) (B)
1/2英吋相当于DN15 俗称4分管(4/8) φ21.3 φ18
3/4英吋相当于DN20 俗称6分管(6/8) φ26.9 φ25
1英吋=25.4mm相当于DN25 俗称1吋管 φ33.7 φ32
1 1/4英吋相当于DN32 俗称1吋2分管(1-2/8) φ42.4 φ38
1 1-2英吋相当于DN40 俗称1吋4分管 φ48.3 φ45
2英吋相当于DN50 俗称2吋管 φ60.3 φ57
2 1/2英吋相当于DN65 俗称2吋半管(2-1/2) φ76.1 φ76
3英吋相当于DN80 俗称3吋管 φ88.9 φ89
4英吋相当于DN100 俗称4吋管 φ114.3 φ108
5英吋相当于DN125 俗称5吋管 φ139.7 φ133
6英吋相当于DN150 俗称6吋管 φ168.3 φ159
8寸 DN200 φ219.1 φ219
10寸 DN250 φ273 φ273
12寸 DN300 φ323.9 φ325
14寸 DN350 φ355.6 φ377
16寸 DN400 φ406.4 φ427
18寸 DN450 φ457 φ480
20寸 DN500 φ508 φ530
24寸 DN600 φ610 φ630
28寸 DN700 φ711 φ720
32寸 DN800 φ813 φ820
36寸 DN900 φ914 φ920
40寸 DN1000 φ1016 φ1020
所以知道外径就可以了,至于牙数查手册得出,因为有的牙数一样而外径是不一样的,英制螺纹参考A系列尺寸就可以了
英制螺纹有55°非密封管螺纹,55°密封管螺纹以及60°密封管螺纹,知道外径就可以查询标准得出公称直径为几分之几英寸螺纹,标准号分别为GB/T7307-2001、GB/T7306-2000、GB/T12716-2002,请到迅雷搜索下载或查询机械设计手册或五金手册。
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