日本标准钢管
黑钢管

 
镀锌钢管 

Nominal Bore *

公称口径

Outside Diameter

外径

D

Wall Thickness **

壁厚

t

A B
mm in mm in mm in
6 1/8 10.5 0.413 2.0 0.079
8 1/4 13.8 0.543 2.3 0.091
10 3/8 17.3 0.681 2.3 0.091
15 1/2 21.7 0.854 2.8 0.110
20 3/4 27.2 1.071 2.8 0.110
25 1 34.0 1.339 3.2 0.126
32 1 1/4 42.7 1.681 3.5 0.138
40 1 1/2 48.6 1.913 3.5 0.138
50 2 60.5 2.382 3.8 0.150
65 2 1/2 76.3 3.004 4.2 0.165
80 3 89.1 3.508 4.2 0.165
90 3 1/2 101.6 4.000 4.2 0.165
100 4 114.3 4.500 4.5 0.177
125 5 139.8 5.504 4.5 0.177
150 6 165.2 6.504 5.0 0.197
175 7 190.7 7.508 5.3 0.209
200 8 216.3 8.516 5.8 0.228
225 9 241.8 9.520 6.2 0.244
250 10 267.4 10.528 6.6 0.260
300 12 318.5 12.539 6.9 0.272
350 14 355.6 14.000 7.9 0.311
400 16 406.4 16.000 7.9 0.311
450 18 457.2 18.000 7.9 0.311
500 20 508.0 20.000 7.9 0.311

Notes :

            1. * For the nominal size, either A or B shall be used and letter symbol

                  A or B shall be suffixed to the figures of nominal size to identify A

                  or B series, respectively.

 

            2. ** Wall thickness t tolerances plus (+) not specified and minus (-) 12.5% max.

 

            3. The value for weight shall be calculated from the following formula

                assuming 7.85 g/cm3 and rounded off to 3 significant figures in accordance

                 with JIS Z 8401 :

                                        W = 0.02466 x t x (D - t )

                                         where W : unit mass of pipe (kg/m)

                                                    t  : wall thickness of pipe (mm)

                                                    D : outside diameter of pipe (mm)