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Flange - Pipe Index

BS EN 1092-1 PN 16 Dimensions


DN = Nominal size, D = Outside Diameter, A = Outside Dia of Neck , B1 = Bore of Type 01 & 12 Flange, C1 = Thickness of Plate Flange,
C2 = Thickness of Weld_Neck and Boss Flange , N1 = Dia of Weld Neck , N2 = Dia of Boss ,R = corner Radius, H1 = Length of Boss Flange,
H2 = Length of Weld Neck Flange, H3 = Length of Neck : S = neck thickness

Note: The flange types shown are only a small part of the range covered in BS EN 1092-1.
  • type 05 is a blank flange
  • type13 is a screwed boss flange
  • type 02 is a loose plate flange used with either
      a type 32 weld on plate collar or
      a type 33 lapped pipe end
  • a type 04 flange is a loose flange for use with a
       type 34 a weld-neck collar
  • type 21 is an integral flange
The Facings shown are type B (Raised Face).  Other Facings include:
Type A..Flat:  Type C..Tongue:   Type D..Groove   Type E..Spigot:  :Type F..Recess:   Type G..O-ring Spigot:  Type H.,0-ring Groove:

A typical designation for a flange would be BS EN 1092-1/01B/DN150/PN16/ */S235JR
Key: = Standard No/Flange Type & Face Type / Nominal Size/ Pressure Rating/*/ Material Designation.
* Normally not used.   For 01 type flanges above 600 mm the bore B1 would be specified here .   * for type 11 and 31 the neck thickness (S) is specified here.
An example designation for an flange for an 800mm pipe ...  BS EN 1092-1/01B/DN800/PN16/818/S235JR

This is an extremely simplified note. To obtain a comprehensive description with the various variations the standards must be used.

Note : All Dimensions in mm

DN D C1 C2 H1 H2 H3 R A N1 N2 B1 d1 f1 S
10 90 14 14 20 35 6 4 17,2 28 30 18 40 2 1,8
15 95 14 14 20 35 6 4 21,3 32 35 22 45 2 2,0
20 105 14 14 24 38 6 4 26,9 39 45 27,5 58 2 2,3
25 115 16 16 24 38 6 4 33,7 46 52 34,5 68 2 2,6
32 140 18 16 26 40 6 6 42,4 56 60 43,5 78 2 2,6
40 150 18 16 26 42 7 6 48,3 64 70 49,5 88 2 2,6
50 165 19 18 28 45 8 6 60,3 75 84 61,5 102 2 2,9
65 185 20 18 32 45 10 6 76,1 90 104 77,5 122 2 2,9
80 200 20 20 34 50 10 8 88,9 105 118 90,5 138 2 3,2
100 220 22 20 40 52 12 8 114,3 131 140 116 158 2 3,6
125 250 22 22 44 55 12 8 139,7 156 168 141,5 188 2 4,0
150 285 24 22 44 55 12 10 168,3 192 195 170,5 212 2 4,5
200 340 26 24 44 62 16 10 219,1 235 246 221,5 268 2 5,6
250 405 29 26 46 70 16 12 273 292 298 276,5 320 2 6,3
300 460 32 28 46 78 16 12 323,9 344 350 327,5 378 2 7,1
350 520 35 30 57 82 16 12 355,6 390 400 359 438 2 8,0
400 580 38 32 63 85 16 12 406,4 445 456 411,0 490 2 8,0
450 640 42 40 68 87 16 12 457,0 490 502 462,0 550 2 8,0
500 715 46 44 73 90 16 12 508,0 548 559 513,5 610 2 8,0
600 840 52 54 83 95 18 12 610,0 652 658 616,5 725 2 8,8
700 910 - 36 83 100 18 12 711,0 755 760 - 795 2 8,8
800 1025 - 38 90 105 20 12 813,0 855 864 - 900 2 10,0
900 1125 - 40 94 110 20 12 914,0 955 968 - 1000 2 10,0
1000 1255 - 42 100 120 22 16 1016,0 1058 1072 - 1115 2 10,0
1200 1485 - 48 - 130 30 16 1219,0 1262 - - 1330 2 12,5
1400 1685 - 52 - 145 30 16 1420,0 1465 - - 1530 2 14,2
1600 1930 - 58 - 160 35 16 1620,0 1668 - - 1750 2 16,0
DN D C1 C2 H1 H2 H3 R A N1 N2 B1 d1 f1 S
Note: in BS EN 1092-1:2002   f1= 2 for all sizes.
In the latest versions of the relevant DIN standard. f1 varies as follow
(DN =< 32 f1 = 1-2, DN 32->250(inc) f1= 1-3, DN 250->500(inc) f1= 1-4, Dn >500 f1= 1-5 )..

Flange Bolting

K = Bolt Circle Diameter, L = Dia Of Bolt Hole,
No = Number of Holes , Size = Size of Bolts

DN K L No Size
mm mm mm - mm
10 60 14 4 M12
15 65 14 4 M12
20 75 14 4 M12
25 85 14 4 M12
32 100 18 4 M16
40 110 18 4 M16
50 125 18 4 M16
65 145 18 8** M16
80 160 18 8 M16
100 180 18 8 M16
125 210 18 8 M16
150 240 22 8 M20
200 295 22 12 M20
250 355 26 12 M24
300 410 26 12 M24
350 470 26 16 M24
400 525 30 16 M27
450 585 30 20 M27
500 650 33 20 M30
600 770 36 20 M33
700 840 36 24 M33
800 950 39 24 M36
900 1050 39 28 M36
1000 1170 42 28 M39
1200 1390 48 32 M45
1400 1590 48 36 M45
1600 1820 56 40 M52
DN K L No Size

** Subject to agreement between the manufacturer and the purchaser 4 holes can be used for PN 16, DN65 steel flanges

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Last Updated 23/01/2013