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 | ||
Note: (1 bar = 14.5 psi = 0.1 MPa = 100 KPa = 1.02 Kgf/cm˛)
**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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