BS Standard

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material-composition
NOMINAL PIPE SIZE OUTSIDE DIA.(MM) DIA. OF BOLT CIRCLE (MM) DIA. OF HOLE (MM) NUMBER OF HOLE DIA. OF BORE THICKNESS MIN.(MM) CHAMFERING APPROX. WEIGHT(KG)
  D C h   do t X  
10 90 60 14 4 21 14 3  
 15 95 65 14 4 25 14 3  
 20 105 75 14 4 31 16 4  
 25 115 85 14 4 38 16 4  
 32 140 100 18 4 47 18 5  
 40 150 110 18 4 53 18 5  
 50 165 125 18 4 65 20 5  
 65 185 145 18 8 81 22 6  
 80 200 160 18 8 94 24 6  
 100 235 190 22 8 120 26 6  
 125 270 220 26 8 145 28 6  
 150 300 250 26 8 174 30 6  
 200 375 320 30 12 226 36 6  
 250 450 385 33 12 281 42 8  
 300 515 450 33 16 333 48 8  
 350 580 510 36 16 365 54 8  
 400 660 585 39 16 416 60 8  
 450 685 610 39 20 467 66 8  
 500 755 670 42 20 519 72 8  
 600 890 795 48 20 622 84 8