WELDING NECK FLANGES ASME B16.5 Class 150

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. 3.50 0.44 1.38 1.19 0.84 1.88 4 0.62 ½ 2.38 2
mm 88.90 11.20 35.10 30.20 21.30 47.80 15.70 12.7 60.5 1
¾ in. 3.88 0.50 1.69 1.50 1.05 2.06 4 0.62 ½ 2.75 2
mm 98.60 12.70 42.90 38.10 26.70 52.30 15.70 12.7 69.9 1
1 in. 4.25 0.56 2.00 1.94 1.32 2.19 4 0.62 ½ 3.12 3
mm 108.00 14.20 50.80 49.30 33.50 55.60 15.70 12.7 79.2 1
1 ¼  in. 4.62 0.62 2.50 2.31 1.66 2.25 4 0.62 ½ 3.5 3
mm 117.30 15.70 63.50 58.70 42.20 57.20 15.70 12.7 88.9 1
1 ½  in. 5.00 0.69 2.88 2.56 1.90 2.44 4 0.62 ½ 3.88 4
mm 127.00 17.50 73.20 65.00 48.30 62.00 15.70 12.7 98.6 2
2 in. 6.00 0.75 3.62 3.06 2.38 2.50 4 0.75  5/8 4.75 6
mm 152.40 19.10 91.90 77.70 60.50 63.50 19.10 15.9 120.7 3
2 ½  in. 7.00 0.88 4.12 3.56 2.88 2.75 4 0.75  5/8 5.5 8
mm 177.80 22.40 104.60 90.40 73.20 69.90 19.10 15.9 139.7 4
3 in. 7.50 0.94 5.00 4.25 3.50 2.75 4 0.75  5/8 6 10
mm 190.50 23.90 127.00 108.00 88.90 69.90 19.10 15.9 152.4 5
3 ½ in. 8.50 0.94 5.50 4.81 4.00 2.81 8 0.75  5/8 7 12
mm 215.90 23.90 139.70 122.20 101.60 71.40 19.10 15.9 177.8 5
4 in. 9.00 0.94 6.19 5.31 4.50 3.00 8 0.75  5/8 7.5 15
mm 228.60 23.90 157.20 134.90 114.30 76.20 19.10 15.9 190.5 7
5 in. 10.00 0.94 7.31 6.44 5.56 3.50 8 0.88 ¾ 8.5 19
mm 254.00 23.90 185.70 163.60 141.20 88.90 22.40 19.1 215.9 9
6 in. 11.00 1.00 8.50 7.56 6.63 3.50 8 0.88 ¾ 9.5 24
mm 279.40 25.40 215.90 192.00 168.40 88.90 22.40 19.1 241.3 11
8 in. 13.50 1.12 10.62 9.69 8.63 4.00 8 0.88 ¾ 11.75 39
mm 342.90 28.40 269.70 246.10 219.20 101.60 22.40 19.1 298.5 1
10 in. 16.00 1.19 12.75 12.00 10.75 4.00 12 1.00  7/8 14.25 52
mm 406.40 30.20 323.90 304.80 273.10 101.60 25.40 22.2 362 24
12 in. 19.00 1.25 15.00 14.38 12.75 4.50 12 1.00  7/8 17 80
mm 482.60 31.80 381.00 365.30 323.90 114.30 25.40 22.2 431.8 36
14 in. 21.00 1.38 16.25 15.75 14.00 5.00 12 1.12 1 18.75 110
mm 533.40 35.10 412.80 400.10 355.60 127.00 28.40 25.4 476.3 50
16 in. 23.50 1.44 18.50 18.00 16.00 5.00 16 1.12 1 21.25 140
mm 596.90 36.60 469.90 457.20 406.40 127.00 28.40 25.4 539.8 64
18 in. 25.00 1.56 21.00 19.88 18.00 5.50 16 1.25 1 1/8 22.75 150
mm 635.00 39.60 533.40 505.00 457.20 139.70 31.80 28.6 577.9 68
20 in. 27.50 1.69 23.00 22.00 20.00 5.69 20 1.25 1 1/8 25 180
mm 698.50 42.90 584.20 558.80 508.00 144.50 31.80 28.6 635 82
24 in. 32.00 1.88 27.25 26.12 24.00 6.00 20 1.38 1 ¼ 29.5 260
mm 812.80 47.80 692.20 663.40 609.60 152.40 35.10 31.8 749.3 118