WELDING NECK FLANGES ASME B16.5 Class 300

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Diameter
of
Raised
Face(2)
Diameter
Of Hub
At Base
Diameter
of Hub at
Point of
Welding
Length
thru
Hub
Number of
Bolt Holes
Diameter
of
Bolt
Holes
Diameter
of
Bolts
Diameter
of
Bolt
Circle
Approx.
Weight

Pounds
Kg

O C R X A Y
½ in. 3.75 0.56 1.38 1.5 0.84 2.06 4 0.62 ½ 2.62 2
mm 95.3 14.2 35.1 38.1 21.3 52.3 15.7 12.7 66.5 1
¾ in. 4.62 0.62 1.69 1.88 1.05 2.25 4 0.75  5/8 3.25 3
mm 117.3 15.7 42.9 47.8 26.7 57.2 19.1 15.9 82.6 1
1 in. 4.88 0.69 2.00 2.12 1.32 2.44 4 0.75  5/8 3.5 4
mm 124 17.5 50.8 53.8 33.5 62 19.1 15.9 88.9 2
1 ¼  in. 5.25 0.75 2.5 2.5 1.66 2.56 4 0.75  5/8 3.88 5
mm 133.4 19.1 63.5 63.5 42.2 65 19.1 15.9 98.6 2
1 ½  in. 6.12 0.81 2.88 2.75 1.9 2.69 4 0.88 ¾ 4.5 7
mm 155.4 20.6 73.2 69.9 48.3 68.3 22.4 19.1 114.3 3
2 in. 6.5 0.88 3.62 3.31 2.38 2.75 8 0.75  5/8 5 9
mm 165.1 22.4 91.9 84 1 60.5 69.9 19.1 15.9 127 4
2 ½  in. 7.5 1.00 4.12 3.94 2.88 3 8 0.88 ¾ 5.88 12
mm 190.5 25.4 104.6 100.1 73.2 76.2 22.4 19.1 149.4 5
3 in. 8.25 1.12 5.00 4.62 3.5 3.12 8 0.88 ¾ 6.62 15
mm 209.6 28 4 127 117.3 88.9 79.2 22.4 19.1 168.1 7
3 ½ in. 9.00 1.19 5.5 5.25 4.00 3.19 8 0.88 ¾ 7.25 18
mm 228.6 30.2 139.7 133.4 101.6 81 22.4 19.1 184.2 8
4 in. 10 1.25 6.19 5.75 4.5 3.38 8 0.88 ¾ 7.88 25
mm 254 31.8 157.2 146.1 114.3 85.9 22.4 19.1 200.2 11
5 in. 11.00 1.38 7.31 7.00 5.56 3.88 8 0.88 ¾ 9.25 32
mm 279.4 35.1 185.7 177.8 141.2 98.6 22.4 19.1 235 15
6 in. 12.5 1.44 8.5 8.12 6.63 3.88 12 0.88 ¾ 10.62 42
mm 317.5 36 6 215.9 206.2 168.4 98.6 22.4 19.1 269.7 19
8 in. 15.00 1.62 10.62 10.25 8.63 4.38 12 1  7/8 13 67
mm 381 41.1 269.7 260.4 219.2 111.3 25.4 22.2 330.2 30
10 in. 17.5 1.88 12 75 12.62 10.75 4.62 16 1.12 1 15.25 91
mm 444.5 47.8 323 9 320.5 273.1 117.3 28.4 25.4 387.4 41
12 in. 20.5 2.00 15.00 14.75 12.75 5.12 16 1.25 1 1/8 17.75 140
mm 520.7 50.8 381 374.7 323.9 130 31.8 28.6 450.9 64
14 in. 23 2.12 16.25 16.75 14 5.62 20 1.25 1 1/8 20.25 180
mm 584.2 53.8 412.8 425.5 355.6 142.7 31.8 28.6 514.4 82
16 in. 25.5 2.25 18.5 19.00 16.00 5.75 20 1.38 1 ¼ 22.5 250
mm 647.7 57.2 469.9 482.6 406.4 146.1 35.1 31.8 571.5 113
18 in. 28.00 2.38 21.00 21.00 18.00 6.25 24 1.38 1 ¼ 24.75 320
mm 711.2 60.5 533.4 533.4 457.2 158.8 35.1 31.8 628.7 145
20 in. 30.5 2.5 23.00 23.12 20.00 6.38 24 1.38 1 ¼ 27 400
mm 774.7 63.5 584.2 587.2 508 162.1 35.1 31.8 685.8 181
24 in. 36.00 2.75 27.25 27.62 24.00 6.62 24 1.62 1 ½ 32 580
mm 914.4 69.9 692.2 701.5 609.6 168.1 41.1 38.1 812.8 263