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ISI 1538 specification MS Flanges

Table 6 Standard Flange Drilling of Flanged Pipes and Fittings (Clause 9.1)

Nominal Diameter (DN) D C
Holes
 Diameter of Bolts
      Number A Diameter d
(1) (2) (3) (4) (5) (6)
80 200 160 4 19 16
100 220 180 8 19 16
125 250 210 8 19 16
150 285 240 8 23 20
200 340 295 8 23 20
250 395 350 12 23 20
300 445 400 12 23 20
350 505 460 16 23 20
400 565 515 16 28 24
450 615 565 20 28 24
500 670 620 20 28 24
600 780 725 20 31 27
700 895 840 24 31 27
750 960 900 24 31 27
800 1015 950 24 34 30
900 1115 1050 28 34 30
1000 1230 1160 28 37 33
1050 1258 1194 28 37 33
1100 1340 1270 32 37 33
1200 1455 1380 32 40 36
1500 1800 1710 40 43 39