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THREADED FLANGES ASME B16.5 Class 300

Nominal
Size
NPS		 Outside
Diameter
of
Flange		 Thickness
of
Flange		 Diameter Of Raised
Face(1)		 Diameter
Of Hub
At Base (2)		 Length
thru
Hub		 Minimum Threaded Lenght Minimum Counter – Bore Number of
Bolt Holes		 Diameter
of
Bolt
Holes		 Diameter
of
Bolts		 Diameter
of
Bolt
Circle		 Approx.
Weight

Pounds
Kg
O C R X Y T Q
½ in. 3.75 0.56 1.38 1.5 0.88 0.62 0.93 4 0.62 ½ 2.62 2
mm 95.3 14.2 35.1 38.1 22.4 15.7 23.6 15.7 12.7 66.5 1
¾ in. 4.62 0.62 1.69 1.88 1 0.62 1.14 4 0.75  5/8 3.25 3
mm 117.3 15.7 42.9 47.8 25.4 15.7 29 19.1 15.9 82.6 1
1 in. 4.88 0.69 2 2.12 1.06 0.69 1.41 4 0.75  5/8 3.5 3
mm 124 17.5 50.8 53.8 26.9 17.5 35.8 19.1 15.9 88.9 1
1 ¼  in. 5.25 0.75 2.5 2.5 1.06 0.81 1.75 4 0.75  5/8 3.88 4
mm 133.4 19.1 63.5 63.5 26.9 20.6 44.5 19.1 15.9 98.6 2
1 ½  in. 6.12 0.81 2.88 2.75 1.19 0.88 1.99 4 0.88 ¾ 4.5 6
mm 155.4 20.6 73.2 69.9 30.2 22.4 50.5 22.4 19.1 114.3 3
2 in. 6.5 0.88 3.62 3.31 1.31 1.12 2.5 8 0.75  5/8 5 7
mm 165.1 22.4 91.9 84.1 33.3 28.4 63.5 19.1 15.9 127 3
2 ½  in. 7.5 1 4.12 3.94 1.5 1.25 3 8 0.88 ¾ 5.88 10
mm 190.5 25.4 104.6 100.1 38.1 31.8 76.2 22.4 19.1 149.4 5
3 in. 8.25 1.12 5 4.62 1.69 1.25 3.63 8 0.88 ¾ 6.62 13
209.6 28.4 127 117.3 42.9 31.8 92.2 22.4 19.1 168.1 6
3 ½ in. 9 1.19 5.5 5.25 1.75 1.44 4.13 8 0.88 ¾ 7.25 17
mm 228.6 30.2 139.7 133.4 44.5 36.6 104.9 22.4 19.1 184.2 8
4 in. 10 1.25 6.19 5.75 1.88 1.44 4.63 8 0.88 ¾ 7.88 22
mm 254 31.8 157.2 146.1 47.8 36.6 117.6 22.4 19.1 200.2 10
5 in. 11 1.38 7.31 7 2 1.69 5.69 8 0.88 ¾ 9.25 28
mm 279.4 35.1 185.7 177.8 50.8 42.9 144.5 22.4 19.1 235 13
6 in. 12.5 1.44 8.5 8.12 2.06 1.81 6.75 12 0.88 ¾ 10.62 39
mm 317.5 36.6 215.9 206.2 52.3 46 171.5 22.4 19.1 269.7 18
8 in. 15 1.62 10.62 10.25 2.44 2 8.75 12 1  7/8 13 58
mm 381 41.1 269.7 260.4 62 50.8 222.3 25.4 22.2 330.2 26
10 in. 17.5 1.88 12.75 12.62 2.62 2.19 10.88 16 1.12 1 15.25 81
mm 444.5 47.8 323.9 320.5 66.5 55.6 276.4 28.4 25.4 387.4 37
12 in. 20.5 2 15 14.75 2.88 2.38 12.94 16 1.25 1 1/8 17.75 115
mm 520.7 50.8 381 374.7 73.2 60.5 328.7 31.8 28.6 450.9 52
14 in. 23 2.12 16.25 16.75 3 2.5 14.19 20 1.25 1 1/8 20.25 165
mm 584.2 53.8 412.8 425.5 76.2 63.5 360.4 31.8 28.6 514.4 75
16 in. 25.5 2.25 18.5 19 3.25 2.69 16.19 20 1.38 1 ¼ 22.5 190
mm 647.7 57.2 469.9 482.6 82.6 68.3 411.2 35.1 31.8 571.5 86
18 in. 28 2.38 21 21 3.5 2.75 18.19 24 1.38 1 ¼ 24.75 250
mm 711.2 60.5 533.4 533.4 88.9 69.9 462 35.1 31.8 628.7 113
20 in. 30.5 2.5 23 23.12 3.75 2.88 20.19 24 1.38 1 ¼ 27 315
mm 774.7 63.5 584.2 587.2 95.3 73.2 512.8 35.1 31.8 685.8 143
24 in. 36 2.75 27.25 27.62 4.19 3.25 24.19 24 1.62 1 ½ 32 475
mm 914.4 69.9 692.2 701.5 106.4 82.6 614.4 41.1 38.1 812.8 215

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