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JIS 20K Flange

Unit : mm
Normal Diameter of Pipe Dimension of Bolt
A C D H No.
mm Inch
10 3/8" 65 90 15 4
15 1/2" 70 95 15 4
20 3/4" 75 100 15 4
25 1" 90 125 19 4
32 1-1/4" 100 135 19 4
40 1-1/2" 105 140 19 4
50 2" 120 155 19 8
65 2-1/2" 140 175 19 8
80 3" 160 200 23 8
90 3-1/2" 170 210 23 8
100 4" 185 225 23 8
125 5" 225 270 25 12
150 6" 260 305 25 12
200 8" 305 350 25 12
250 10" 380 430 28 12
300 12" 430 480 27 16
350 14" 480 540 33 16
400 16" 540 605 33 16
450 18" 605 675 33 20
500 20" 660 730 33 20
550 22" 720 795 39 20
600 24" 770 845 39 24