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DIN DIMENSIONS

American Alloy Flange Technical Data Chart
Diameters & Drilling of DIN Flanges ( mm )

DN A B C D E F G H K M N R
10 90 60 40 2 17.2 28 14 2 16 35 6 4
15 95 65 45 2 21.3 32 14 2 16 38 6 4
20 105 75 58 2.3 26.9 40 14 2 18 40 6 4
25 115 85 68 2.6 33.7 46 14 2 18 40 6 4
32 140 100 78 2.6 42.4 56 18 2 18 42 6 6
40 150 110 88 2.6 48.3 64 18 3 18 45 7 6
50 165 125 102 2.9 60.3 74 18 3 18 45 8 6
65 185 145 122 2.9 76.1 92 18 3 18 45 10 6
80 200 160 138 3.2 88.9 105 18 3 20 50 10 6
100 220 180 158 3.6 114.3 131 18 3 20 52 12 8
125 250 210 188 4 139.7 156 18 3 22 55 12 8
150 285 240 212 4.5 168.3 184 22 3 22 55 12 10
200 340 295 268 6.3 219.1 235 22 3 24 62 16 10
250 405 355 320 6.3 273 292 26 3 26 70 16 12
300 460 410 378 7.1 323.9 344 26 4 28 78 16 12
350 520 470 438 8 355.6 390 26 4 30 82 16 12
400 580 525 490 8 406.4 445 30 4 32 85 16 12
450 640 585 550 8 457 490 30 4 34 83 16 12
500 715 650 610 8 508 548 33 4 36 84 16 12
600 840 770 725 10 610 670 36 5 40 88 18 12
700 910 840 795 10 711 755 36 5 40 104 18 12
800 1025 950 900 12.5 813 855 39 5 62 108 20 12
900 1125 1050 1000 12.5 914 955 39 5 64 118 20 12
1000 1255 1170 1115 12.5 1016 1058 42 5 68 137 22 16
1200 1485 1390 1330 14.2 1219 1262 48 5 78 160 30 16
1400 1685 1590 1530 16 1422 1465 48 5 84 177 30 16
1600 1930 1820 1750 17.5 1626 1668 56 5 102 204 35 16
1800 2130 2020 1950 20 1829 1870 56 5 110 218 35 16
2000 2345 2230 2150 22 2032 2072 62 5 124 238 40 16
DN A B C D E F G H K M N R
DN No of
bolts		 Dia of
Hex Bolts		 Length of
Hex Bolts		 Dia of
Stud Bolts		 Length of
Stud Bolts
10 4 M12 50 1/2″ 65
15 4 M12 50 1/2″ 65
20 4 M12 55 1/2″ 70
25 4 M12 55 1/2″ 70
32 4 M16 60 5/8″ 80
40 4 M16 60 5/8″ 80
50 4 M16 60 5/8″ 80
65 8 M16 60 5/8″ 80
80 8 M16 65 5/8″ 80
100 8 M16 65 5/8″ 80
125 8 M16 65 5/8″ 85
150 8 M20 70 3/4″ 95
200 12 M20 75 3/4″ 95
250 12 M24 85 7/8″ 110
300 12 M24 90 7/8″ 110
350 16 M24 90 7/8″ 115
400 16 M27 100 1″ 130
450 20 M27 105 1″ 130
500 20 M30 110 1.1/8″ 145
600 20 M33 120 1.1/4″ 160
700 24 M33 120 1.1/4″ 160
800 24 M36 170 1.3/8″ 210
900 28 M36 175 1.3/8″ 215
1000 28 M39 185 1.1/2″ 230
1200 32 M45 210 1.3/4″ 265
1400 36 M45 225 1.3/4″ 275
1600 40 M52 270 2″ 325
1800 44 M52 285 2″ 345
2000 48 M56 315 2.1/4″ 385
DN No of
bolts		 Dia of
Hex Bolts		 Length of
Hex Bolts		 Dia of
Stud Bolts		 Length of
Stud Bolts
Indications:

  • A = Outside Diameter
  • B = Diameter of Bolt Circle
  • G = Diameter of Bolt Holes
  • C = Diameter of Raised Face
  • H = Height of Raised Face
  • E = Outside Diameter of Neck
  • K = Flange thickness
  • M = Length of Flange
  • N = Length of right end
  • F = Neck Diameter
  • R = Radius of Corners
  • D = Wall thickness
 Vorschweiss Flansch

General notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • Butt-weld ends (must be specified when ordering) acc. to DIN 3239-1-R6 edge form 22 to DIN 2559 (DIN EN ISO 9692)

Special notes:

  • Hex bolt lengths and diameters & lengths of Stud Bolts are calculated by the author of this website.
  • All lengths are calculated without washers, spring washers etc. and free threads (equals 1/3 time bolt diameter)
  • All lengths are calculated with a gasket thickness of 3 mm.
  • The dimensions of the bolts are calculated for the type 11 weld neck flange. Other types of flanges can be have
    different bolt hole diameters and thicknesses, so that the bolts even can have different dimensions.
Measuring lengths of Stud Bolts and Hex bolts
Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.