公制美制英制螺纹对照表

公制/美制/英制螺纹对照表

A型美制螺纹（UNF）常用规格

外螺纹内螺纹

-4 9/16"-19牙14.28 13.08

-6 11/16''-16 17.46 16.1

-8 13/16''-16 20.64 19.28

-10 1''-14 25.40 23.57

-12 1(3/16)''-12 30.00 28.32

-16 1(7/16)''-12 36.51 34.67

-20 1(11/16)''-12 42.86 41.02

C型JIC37度美制UNF螺纹常用规格

=============C型JIC37度美制UNF螺纹常用规格================ -4 7/16”-20 11.11 10.03

-5 1/2”-20 12.70 11.32

-6 9/16”-18 14.28 13.08

-8 3/4”-16 19.00 17.68

-10 7/8”-14 22.22 20.68

-12 1(1/16)"-12 26.98 25.15

-16 1(5/16)"-12 33.33 31.5

-20 1(5/8)"-12 41.28 39.44

-24 1(7/8)"-12 47.62 45.8

-32 2(1/2)"-12 63.5 61.67

==============英制圆柱管螺纹（BSPP）常用规格======================== -4 1/4”-19 13.157 11.55

-6 3/8”-19 16.662 14.95

-8 1/2”-14 20.955 18.63

-12 3/4”-14 26.441 24.11 -

-16 1”-11 33.249 30.29

-20 1(1/4)''-11 41.91 38.95

=====================英制圆锥管螺纹（BSPT）常用规格================ 基面大径基准距离-

1/4”-19 13.157 6

3/8”-19 16.662 6.4

1/2”-14 20.955 8.2

3/4”-14 26.441 9.5

1”-11 33.249 10.4

1(1/4)''-11 41.91 12.7

==================美制圆锥管螺纹（NPT）=============================== 1/8”-27 10.24 4

1/4”-18 13.60 4

3/8”-18 17.04 4.32

1/2”-14 21.22 4.48

3/4”-14 26.57 4.75

1”-11(1/2)” 33.22 4.6

1(1/4)”-11.5 41.96 4.83