Dimensions of Class 300 RF Weld Neck Flanges

Expired

All dimensions are in "mm" unless noted otherwise.

Dimensions of Class 300 RF Weld Neck Flanges as per ASME B16.5.

Weld Neck Flange

Nominal
Pipe Size		 Outside Dia
of Flange
(O)		 Thick of
Flange
(C)		 Dia of
Raised Face
(R)		 Dia of
Hub at Base
(X)		 Dia of
Hub at End
(A)		 Length
thru Hub
(V)		 No of
Holes		 Dia of
Holes
(H)		 Dia of
Bolts		 Dia of
Bolt Circle
(B)		 Approx
weight
(kg)
1/2 95.3 14.2 35.1 38.1 21.3 52.3 4 15.7 1/2 66.5 1
3/4 117.3 15.7 42.9 47.8 26.7 57.2 4 19.1 5/8 82.6 1
1 124 17.5 50.8 53.8 33.5 62 4 19.1 5/8 88.9 2
1-1/4 133.4 19.1 63.5 63.5 42.2 65 4 19.1 5/8 98.6 2
1-1/2 155.4 20.6 73.2 69.9 48.3 68.3 4 22.4 3/4 114.3 3
2 165.1 22.4 91.9 84.1 60.5 69.9 8 19.1 5/8 127 4
2-1/2 190.5 25.4 104.6 100.1 73.2 76.2 8 22.4 3/4 149.4 5
3 209.6 28.4 127 117.3 88.9 79.2 8 22.4 3/4 168.1 7
3-1/2 228.6 30.2 139.7 133.4 101.6 81 8 22.4 3/4 184.2 8
4 254 31.8 157.2 146.1 114.3 85.9 8 22.4 3/4 200.2 11
5 279.4 35.1 185.7 177.8 141.2 98.6 8 22.4 3/4 235 15
6 317.5 36.6 215.9 206.2 168.4 98.6 12 22.4 3/4 269.7 19
8 381 41.1 269.7 260.4 219.2 111.3 12 25.4 7/8 330.2 30
10 444.5 47.8 323.9 320.5 273.1 117.3 16 28.4 1 387.4 41
12 520.7 50.8 381 374.7 323.9 130 16 31.8 1-1/8 450.9 64
14 584.2 53.8 412.8 425.5 355.6 142.7 20 31.8 1-1/8 514.4 82
16 647.7 57.2 469.9 482.6 406.4 146.1 20 35.1 1-1/4 571.8 113
18 711.2 60.5 533.4 533.4 457.2 158.8 24 35.1 1-1/4 628.7 145
20 774.7 63.5 584.2 587.2 508 162.1 24 35.1 1-1/4 685.8 181
24 914.4 69.9 692.2 701.5 609.6 168.1 24 41.1 38.1 812.8 263
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