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Maryland Metrics Technical Data Chart
Diameters & Drilling of DIN Flanges ( mm )


Flange Nominal Diameter Pressure Rating (PN)  
**Nominal BSP Pipe Size PN6 PN10 PN16 PN25 PN40  
DN 10 75 90 90 90 90 O.D.
3/8" 50 60 60 60 60 PCD (bolt circle)
  4 x 11 4 x 14 4 x 14 4 x 14 4 x 14 # of holes x diam. of holes
DN 15 80 95 95 95 95 O.D.
1/2" 55 65 65 65 65 PCD (bolt circle)
  4 x 11 4 x 14 4 x 14 4 x 14 4 x 14 # of holes x diam. of holes
DN 20 90 105 105 105 105 O.D.
3/4" 65 75 75 75 75 PCD (bolt circle)
  4 x 11 4 x 14 4 x 14 4 x 14 4 x 14 # of holes x diam. of holes
DN 25 100 115 115 115 115 O.D.
1" 75 85 85 85 85 PCD (bolt circle)
  4 x 11 4 x 14 4 x 14 4 x 14 4 x 14 # of holes x diam. of holes
DN 32 120 140 140 140 140 O.D.
1 1/4" 90 100 100 100 100 PCD (bolt circle)
  4 x 14 4 x 18 4 x 18 4 x 18 4 x 18 # of holes x diam. of holes
DN 40 130 150 150 150 150 O.D.
1 1/2" 100 110 110 110 110 PCD (bolt circle)
  4 x 14 4 x 18 4 x 18 4 x 18 4 x 18 # of holes x diam. of holes
DN 50 140 165 165 165 165 O.D.
2" 110 125 125 125 125 PCD (bolt circle)
  4 x 14 4 x 18 4 x 18 4 x 18 4 x 18 # of holes x diam. of holes
DN 65 160 185 185 185 185 O.D.
2 1/2" 130 145 145 145 145 PCD (bolt circle)
  4 x 14 4 x 18 4 x 18 8 x 18 8 x 18 # of holes x diam. of holes
DN 80 190 200 200 200 200 O.D.
3" 150 160 160 160 160 PCD (bolt circle)
  4 x 18 8 x 18 8 x 18 8 x 18 8 x 18 # of holes x diam. of holes
DN 100 210 220 220 235 235 O.D.
4" 170 180 180 190 190 PCD (bolt circle)
  4 x 18 8 x 18 8 x 18 8 x 22 8 x 22 # of holes x diam. of holes
DN 125 240 250 250 270 270 O.D.
5" 200 210 210 220 220 PCD (bolt circle)
  8 x 18 8 x 18 8 x 18 8 x 26 8 x 26 # of holes x diam. of holes
DN 150 265 285 285 300 300 O.D.
6" 225 240 240 250 250 PCD (bolt circle)
  8 x 18 8 x 22 8 x 22 8 x 26 8 x 26 # of holes x diam. of holes
DN 175   315 315 330 350 O.D.
7"   270 270 280 295 PCD (bolt circle)
    8 x 22 8 x 22 12 x 26 12 x 30 # of holes x diam. of holes
DN 200 320 340 340 360 375 O.D.
8" 280 295 295 310 320 PCD (bolt circle)
  8 x 18 8 x 22 12 x 22 12 x 26 12 x 30 # of holes x diam. of holes
DN 250 375 395 405 425 450 O.D.
10" 335 350 355 370 385 PCD (bolt circle)
  12 x 18 12 x 22 12 x 26 12 x 30 12 x 33 # of holes x diam. of holes
DN 300 440 445 460 485 515 O.D.
12" 395 400 410 430 450 PCD (bolt circle)
  12 x 22 12 x 22 12 x 26 16 x 30 16 x 33 # of holes x diam. of holes
DN 350 490 505 520 555 580 O.D.
14" 445 460 470 490 510 PCD (bolt circle)
  12 x 22 16 x 22 16 x 26 16 x 33 16 x 36 # of holes x diam. of holes
DN 400 540 565 580 620 660 O.D.
16" 495 515 525 550 585 PCD (bolt circle)
  16 x 22 16 x 26 16 x 30 16 x 36 16 x 39 # of holes x diam. of holes
DN 500 645 670 715 730 755 O.D.
20" 600 620 650 660 670 PCD (bolt circle)
  20 x 22 20 x 26 20 x 33 20 x 36 20 x 42 # of holes x diam. of holes
DN 600 755 780 840 845   O.D.
24" 705 725 770 770   PCD (bolt circle)
  20 x 24 20 x 27 20 x 33 20 x 36   # of holes x diam. of holes
O.D. = outside diameter    PCD = bolt circle diameter    PN = nominal pressure in bars
Note: (1 bar = 14.5 psi = 0.1 MPa = 100 KPa = 1.02 Kgf/cm²)


**Nominal Pipe Sizes as used in this table are NOT USA sizes, but are the BSP (British Standard Pipe sizes)
which are similar to but NOT the same. Click here for a BSP/USA pipe O.D. comparison chart.

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