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WELDING NECK FLANGES ASME B16.5 Class 1500

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. 4.75 0.88 1.38 1.50 0.84 2.38 4 0.88 ¾ 3.25 5
mm 120.70 22.40 35.10 38.10 21.30 60.50 22.40 19.10 82.60 2
¾ in. 5.12 1.00 1.69 1 75 1.05 2.75 4 0.88 ¾ 3.50 6
mm 130.00 25.40 42.90 44 5 26.70 69.90 22.40 19.10 88.90 3
1 in. 5.88 1.12 2.00 2.06 1.32 2.88 4 1.00  7/8 4.00 9
mm 149.40 28.40 50.80 52.30 33.50 73.20 25.40 22.20 101.60 4
1 ¼  in. 6.25 1.12 2.50 2.50 1.66 2.88 4 1.00  7/8 4.38 10
mm 158.80 28.40 63.50 63.50 42.20 73.20 25.40 22.20 111.30 5
1 ½  in. 7.00 1.25 2.88 2.75 1.90 3.25 4 1.12 1.00 4.88 13
mm 177.80 31.80 73.20 69.90 48.30 82.60 28.40 25.40 124.00 6
2 in. 8.50 1.50 3.62 4.12 2.38 4.00 8 1.00  7/8 6.50 25
mm 215.90 38 1 91.90 104.60 60.50 101.60 25.40 22.20 165.10 11
2 ½  in. 9.62 1.62 4.12 4.88 2.88 4.12 8 1.12 1.00 7.50 36
mm 244.30 41.10 104.60 124.00 73.20 104.60 28.40 25.40 190.50 16
3 in. 10.50 1 88 5.00 5.25 3.50 4.62 8 1.25 1 1/8 8.00 48
mm 266.70 47 8 127.00 133.40 88.90 117.30 31.80 28.60 203.20 22
4 in. 12.25 2.12 6.19 6.38 4.50 4.88 8 1.38 1 ¼ 9.50 73
mm 311.20 53.80 157.20 162.10 114.30 124.00 35.10 31.80 241.30 33
5 in. 14.75 2.88 7.31 7.75 5.56 6.12 8 1 62 1 ½ 11.50 130
mm 374.70 73.20 185.70 196.90 141.20 155.40 41.10 38.10 292.10 59
6 in. 15.50 3.25 8.50 9.00 6.63 6.75 12 1.50 1 3/8 12.50 165
mm 393.70 82.60 215.90 228.60 168.40 171.50 38.10 34.90 317.50 75
8 in. 19.00 3.62 10.62 11.50 8.63 8.38 12 1.75 1 5/8 15.50 275
mm 482.60 91.90 269.70 292.10 219.20 212.90 44.50 41.30 393.70 125
10 in. 23.00 4.25 12.75 14.50 10.75 10.00 12 2.00 1 7/8 19.00 455
mm 584.20 108.00 323.90 368.30 273.10 254.00 50.80 47.60 482.60 206
12 in. 26.50 4.88 15.00 17.75 12.75 11 12 16 2 12 2.00 22.50 690
mm 673.10 124 0 381.00 450.90 323.90 282.40 53.80 50.80 571.50 313
14 in. 29.50 5.25 16.25 19.50 14.00 11.75 16 2.38 2 ¼ 25.00 940
mm 749.30 133.40 412.80 495.30 355.60 298.50 60.50 57.20 635.00 426
16 in. 32.50 5.75 18 50 21.75 16.00 12.25 16 2.62 2 ½ 27.75 1250
mm 825.50 146.10 469.90 552.50 406.40 311.20 66.50 63.50 704.90 567
18 in. 36.00 6.38 21.00 23.50 18.00 12.88 16 2.88 2 ¾ 30.50 1625
mm 914.40 162.10 533.40 596.90 457.20 327.20 73.20 69.90 774.70 737
20 in. 38.75 7.00 23.00 25.25 20.00 14.00 16 3.12 3.00 32.75 2050
mm 984.30 177.80 584 2 641.40 508.00 355.60 79.20 76.20 831.90 930
24 in. 46.00 8.00 27.25 30.00 24.00 16.00 16 3.62 3 ½ 39.00 3325
mm 1168.40 203.20 692.20 762.00 609.60 406.40 91.90 88.90 990.60 1508

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