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Welding Neck Flanges – Class 300

Welding Neck Flanges

Class 300

Nominal size   O C R X A Y No. of holes Diam. of holes Diam. of bolts Diam. of bolt circle Approx. weight pounds Kg
    O C R X A Y          
in. 1/2″ 3.75 0.56 1.38 1.5 0.84 2.06 4 0.62 1/2″ 2.62 2
mm.   95.3 14.2 35.1 38.1 21.3 52.3   15.7 12.7 66.5 1
in. 3/4″ 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
in. 1″ 4.88 0.69 2 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
in. 1 1/4″ 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
in. 1 1/2″ 6.12 0.81 2.88 2.75 1.9 2.69 4 0.88 3/4″ 4.5 7
mm.   155.4 20.6 73.2 69.9 48.3 68.3   22.4 19.1 114.3 3
in. 2″ 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
in. 2 1/2″ 7.5 1 4.12 3.94 2.88 3 8 0.88 3/4″ 5.88 12
mm.   190.5 25.4 104.6 100.1 73.2 76.2   22.4 19.1 149.4 5
in. 3″ 8.25 1.12 5 4.62 3.5 3.12 8 0.88 3/4″ 6.62 15
mm.   209.6 28.4 127 117.3 88.9 79.2   22.4 19.1 168.1 7
in. 3 1/2″ 9 1.19 5.5 5.25 4 3.19 8 0.88 3/4″ 7.25 18
mm.   228.6 30.2 139.7 133.4 101.6 81   22.4 19.1 184.2 8
in. 4″ 10 1.25 6.19 5.75 4.5 3.38 8 0.88 3/4″ 7.88 25
mm.   254 31.8 157.2 146.1 114.3 85.9   22.4 19.1 200.2 11
in. 5″ 11 1.38 7.31 7 5.56 3.88 8 0.88 3/4″ 9.25 32
mm.   279.4 35.1 185.7 177.8 141.2 98.6   22.4 19.1 235 15
in. 6″ 12.5 1.44 8.5 8.12 6.63 3.88 12 0.88 3/4″ 10.62 42
mm.   317.5 36.6 215.9 206.2 168.4 98.6   22.4 19.1 269.7 19
in. 8″ 15 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
in. 10″ 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
in. 12″ 20.5 2 15 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
in. 14″ 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
in. 16″ 25.5 2.25 18.5 19 16 5.75 20 1.38 1 1/4″ 22.5 250
mm.   647.7 57.2 469.9 482.6 406.4 146.1   35.1 31.8 571.5 113
in. 18″ 28 2.38 21 21 18 6.25 24 1.38 1 1/4″ 24.75 320
mm.   711.2 60.5 533.4 533.4 457.2 158.8   35.1 31.8 628.7 145
in. 20″ 30.5 2.5 23 23.12 20 6.38 24 1.38 1 1/4″ 27 400
mm.   774.7 63.5 584.2 587.2 508 162.1   35.1 31.8 685.8 181
in. 24″ 36 2.75 27.25 27.62 24 6.62 24 1.62 1 1/2″ 32 580
mm.   914.4 69.9 692.2 701.5 609.6 168.1   41.1 38.1 812.8 263
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