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Dimensions of the steel Flanges DN 500 - 20"
n° - number of holes
dia - diameter of bolts
| Flange standard |
PN
Rating |
D |
K |
L |
n° |
dia |
c |
d |
f |
UNI 2223
DIN 2501
BS 4504
NF E 29-203*
ISO/DIS 7005-1.2* |
2,5-6 |
645 |
600 |
22 |
20 |
M20 |
28 |
570 |
4 |
| 10 |
670 |
620 |
26 |
20 |
M24 |
28 |
585 |
4 |
| 16 |
715 |
650 |
33 |
20 |
M30 |
36 |
610 |
4 |
| 25 |
730 |
660 |
36 |
20 |
M33 |
44 |
615 |
4 |
| 40 |
755 |
670 |
42 |
20 |
M39 |
52 |
615 |
4 |
| 64 |
800 |
705 |
48 |
20 |
M46 |
68 |
590
|
4 |
| 100 |
870 |
760 |
56 |
20 |
M54 |
94 |
590
|
4
|
ISO/DIS 7005-1.2
NF E 29-203 |
20 |
700 |
635 |
32,5 |
20 |
M30 |
43,0 |
584,5 |
2 |
| 50 |
775 |
686
|
35,5 |
24 |
M33 |
63,5 |
584,5 |
2 |
| 100 |
815 |
724 |
45,0 |
24 |
M42 |
89,0 |
584,5 |
7** |
ANSI B 16.5
BS 1560 |
150 |
27,50
(698,5) |
25,00
(635,0) |
1,25
(31,7) |
20 |
1,12
(28,6) |
1,69
(17,5) |
23,00
(584,2) |
0,06
(1.6) |
| 300 |
30,50
(774,7) |
27,00
(685,8)
|
1,38
(34,9) |
24 |
1,25
(31,8) |
2,50
(63,5) |
23,00
(584,2) |
0,06
(1,6) |
| 400 |
30,50
(774,7) |
27,00
(685,8) |
1,62
(41,3) |
24 |
1,50
(38,1) |
2,75
(69,8) |
23,00
(584,2) |
0,25**
(6,4) |
| 600 |
32,00
(812,8) |
28,50
(723,9) |
1,75
(44,4) |
24 |
1,62
(41,3)
|
3,50
(88,9) |
23,00
(584,2) |
0,25**
(6,4) |
| 900 |
33,75
(857,2) |
29,50
(749,3) |
2,12
(54,0)
|
20 |
2,00
(50,8) |
4,12
(107,9)
|
23,00
(584,2) |
0,25**
(6,4) |
BS 10
AS 2129 |
A |
27¾
(704,9) |
25¼
(641,4) |
1
(25,4) |
12 |
⅞
(22,2) |
1
(25,4) |
— |
— |
| D |
27¾
(704,9) |
25¼
(641,4) |
1
(25,4) |
16 |
⅞
(22,2) |
1¼
(31,8) |
— |
— |
| E |
27¾
(704,9) |
25¼
(641,4) |
1
(25,4) |
16 |
⅞
(22,2) |
1¼
(31,8) |
— |
— |
| F |
29
(736,6)
|
26½
(673,1) |
1¼
(31,8) |
24 |
1⅛
(28,7) |
1½
(38,1) |
— |
— |
| H |
29
(736,6) |
26½
(673,1) |
1¼
(31,8) |
24 |
1⅛
(28,7) |
2
(50,8) |
23½
(596,9) |
1/16
(1.6) |
| J |
29
(736,6) |
26½
(673,1) |
1⅜
(34,9) |
24 |
1¼
(31,8) |
2½
(63,5)
|
23½
(596,9) |
1/16
(1.6) |
Note - The dimensions of ANSI - BS -AS flanges are in inch; the others are in mm (the ones in brackets included which are derived from the dimensions in inch)* For ratings 2,5-6-10-16-25-40 only** To be added to the thickness C of the flange
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Reference Manual 
