THREADED ORIFICE FLANGES Class 300

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Diameter Of Raised
Face
Diameter Of Hub At Base Length
thru
Hub
Diameter Of Counterbore Counterbore Deph (From Face) Diameter Of Pressure Connection Number of
Bolt Holes
Diameter
of
Bolt
Holes
Diameter
of
Bolts
Diameter
of
Bolt
Circle
O C R X Y Qb(2) Qf(3) F G TT
1 in. 4.88 1.5 2 2.12 1.88 1.41 1.3 1.44 0.75 ¼ 4 0.69  5/8 3.5
mm 124 38.1 50.8 53.8 47.8 35.8 33 36.6 19.1 6.4 17.5 15.9 88.9
1 ½ in. 6.12 1.5 2 88 2.75 1.88 1.99 1.89 1.47 0.72 ¼ 4 0.81 ¾ 4.5
mm 155.4 38.1 73.2 69.9 47.8 50.5 48 37.3 18.3 6.4 20.6 19.1 114.3
2 in. 6.5 1.5 3.62 3.31 1.94 2.5 2.36 1.5 0.69 ¼ 8 0.69  5/8 5
mm 165.1 38.1 91.9 84.1 49.3 63.5 59.9 38.1 17.5 6.4 17.5 15.9 127
2 ½ in. 7.5 1.5 4.12 3.94 2 3 2.84 1.75 0.56 ¼ 8 0.81 ¾ 5.88
mm 190.5 38.1 104.6 100.1 50.8 76.2 72.1 44.5 14.2 6.4 20.6 19.1 149.4
3 in. 8.25 1.5 5 4.62 2.06 3.63 3.46 1.81 0.56  3/8 8 0.81 ¾ 6.62
mm 209.6 38.1 127 117.3 52.3 92.2 87.9 46 14.2 9.5 20.6 19.1 168.1
4 in. 10 1.5 6.19 5.75 2.12 4.63 4.45 1.88 0.56 ½ 8 0.81 ¾ 7.88
mm 254 38.1 157.2 146.1 53.8 117.6 113 47.8 14.2 12.7 20.6 19.1 200.2
6 in. 12.5 1.5 8.5 8.12 2.12 6.75 6.57 1.88 0.31 ½ 12 0.88 ¾ 10.62
mm 317.5 38.1 215.9 206.2 53.8 171.5 166.9 47.8 7.9 12.7 22.4 19.1 269.7
8 in. 15 1.62 10.62 10.25 2.44 8.75 8.55 2.19 0.44 ½ 12 1  7/8 13
mm 381 41.1 269.7 260.4 62 222.3 217.2 55.6 11.2 12.7 25.4 22.2 330.2