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WELDING NECK FLANGES ASME B16.5 Class 2500

Nominal
Size
NPS		 Outside
Diameter
of
Flange		 Thickness
of
Flange		 Diameter
of
Raised
Face		 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. 5.25 1.19 1.38 1.69 0.84 2.88 4 0.88 ¾ 3.50 7
mm 133.40 30.20 35.10 42.90 21.30 73.20 22.40 19.1 88.90 3
¾ in. 5.50 1.25 1.69 2.00 1.05 3 12 4 0.88 ¾ 3.75 8
mm 139.70 31.80 42.90 50 8 26.70 79 2 22.40 19.1 95.30 4
1 in. 6.25 1.38 2.00 2.25 1.32 3.50 4 1.00  7/8 4.25 12
mm 158.80 35.10 50.80 57.20 33.50 88.90 25.40 22.2 108.00 5
1 ¼  in. 7.25 1.50 2.50 2.88 1.66 3.75 4 1.12 1 5.12 17
mm 184.20 38.10 63.50 73.20 42.20 95.30 28.40 25.4 130.00 8
1 ½  in. 8.00 1.75 2.88 3.12 1.90 4.38 4 1.25 1 1/8 5.75 25
mm 203.20 44.50 73.20 79.20 48.30 111.30 31.80 28.6 146.10 11
2 in. 9.25 2.00 3 62 3.75 2.38 5.00 8 1.12 1 6.75 42
mm 235.00 50.80 91.90 95.30 60.50 127.00 28.40 25.4 171.50 19
2 ½  in. 10.50 2.25 4.12 4.50 2.88 5.62 8 1.25 1 1/8 7.75 52
mm 266.70 57.20 104.60 114.30 73.20 142.70 31.80 28.6 196.90 24
3 in. 12.00 2.62 5.00 5.25 3.50 6.62 8 1.38 1 ¼ 9.00 94
mm 304.80 66.50 127.00 133.40 88.90 168.10 35.10 31.8 228.60 43
4 in. 14.00 3.00 6.19 6.50 4.50 7.50 8 1.62 1 ½ 10.75 145
mm 355.60 76.20 157.20 165.10 114.30 190.50 41.10 38.1 273.10 66
5 in. 16.50 3.62 7.31 8.00 5.56 9.00 8 1.88 1 ¾ 12.75 245
mm 419.10 91.90 185.70 203.20 141.20 228.60 47.80 44.5 323.90 111
6 in. 19.00 4.25 8.50 9.25 6.63 10.75 8 2.12 2 14.50 380
mm 482.60 108.00 215.90 235.00 168.40 273.10 53.80 50.8 368.30 172
8 in. 21.75 5.00 10.62 12.00 8.63 12.50 12 2.12 2 17.25 580
mm 552.50 127.00 269.70 304.80 219.20 317.50 53 8 50.8 438.20 263
10 in. 26.50 6.50 12.75 14.75 10.75 16.50 12 2.62 2 ½ 21.25 1075
mm 673.10 165.10 323.90 374.70 273.10 419.10 66.50 63.5 539.80 488
12 in. 30.00 7.25 15.00 17.38 12.75 18.25 12 2.88 2 ¾ 24.38 1525
mm 762.00 184 2 381.00 441.50 323 9 463 6 73.20 69.9 619.30 692

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