ANSI B16.5 FORGED FLANGES  Unit: mm
Class 300 Normal Flanges
Nominal Pipe Size Outside Diam Diam of Base of Hud O.D. of Raised Face Thick-ness  Lap Joint thick-ness BORE LENGTH THRU HUB Diam of Hub of Bevel Radius of Fillet Thread Length Depth of Socket Drilling  Bolting Approximate Weight Nominal Pipe Size
Welding Neck Socket Welding Slip-on Socket Welding Lap Joint Counter Bore Mn. Threaded Mn. Welding Neck  Slip-on Threaded Socket Welding Lap Joint Bolt Circle Diam Number of Holes  Diam of Holes Diam of Bolts (inch)  Machine Bolt Length Stud Bolt
Length		 Welding Neck Slip-on and
Threaded		 Lap Joint Blind Socket
Welding
Raised Face Raised Face Ring Joint
  D X G t t1 B1 B2 B3 B T1 T2 T3 A R Q Y Kg Ib Kg Ib Kg Ib Kg Ib Kg Ib
½ 95 38.1 35.1 12.6 14.2 15.7 22.4 22.9 23.6 50.8 20.8 22.4 21.3 3.0 15.7 9.7 66.5 4 15.7 ½ 57.2 63.5 76.2 0.78 1.7 0.62 1.4 0.61 1.3 0.62 1.4 0.62 1.4 ½
¾  117 47.8 42.9 14.1 15.7 20.8 27.7 28.2 29.0 55.6 23.8 25.4 26.7 3.0 15.7 11.2 82.6 4 19.1 8-Mar 63.5 76.2 88.9 1.34 3 1.15 2.5 1.15 2.5 1.16 2.5 1.19 2.6 ¾ 
1 124 53.8 50.8 15.9 17.5 26.7 34.5 35.1 35.8 60.4 25.3 26.9 33.5 3.0 17.5 12.7 88.9 4 19.1 8-May 63.5 76.2 88.9 1.64 3.6 1.39 3.1 1.38 3 1.42 3 1.44 3.2 1
1 ¼  133 63.5 63.5 17.5 19.1 35.1 43.2 43.7 44.5 63.5 25.3 26.9 42.2 4.8 20.6 14.2 98.6 4 19.1 8-May 69.9 82.6 95.3 2.06 4.5 1.67 3.7 1.66 3.7 1.79 3.9 1.73 3.8 1 ¼ 
1 ½  155 69.9 73.2 19.0 20.6 40.9 49.5 50.0 50.5 66.7 28.6 30.2 48.3 6.4 22.4 15.7 114.3 4 22.4 ¾ 76.2 88.9 101.6 3.06 6.7 2.53 5.6 2.52 5.6 2.68 5.9 2.62 5.8 1 ½ 
2 165 84.1 91.9 20.8 22.4 52.6 62.0 62.5 63.5 68.3 31.7 33.3 60.5 7.9 25.4 17.5 127 8 19.1 8-May 76.2 88.9 101.6 3.4 7.5 2.8 6.2 2.79 6.2 3.09 6.8 2.94 6.5 2
2 ½  191 100.1 104.6 23.8 25.4 62.7 74.7 75.4 76.2 74.6 36.5 38.1 73.2 7.9 28.4 19.1 149.4 8 22.4 ¾ 82.6 101.6 114.3 5.31 11.7 4.25 9.4 4.22 9.3 4.75 10.5 4.49 9.9 2 ½ 
3 210 117.3 127.0 26.8 28.4 78.0 90.7 91.4 92.2 77.6 41.3 42.9 88.9 9.7 30.2 20.6 168.1 8 22.4 ¾ 88.9 108 120.7 7.32 16.1 5.81 12.8 5.78 12.7 6.79 14.9 6.2 13.7 3
3 ½  229 133.4 139.7 28.6 30.2 90.2 103.4 104.1 104.9 79.4 42.9 44.5 101.6 9.7 31.8 22.4 184.2 8 22.4 ¾ 95.3 108 127 8.17 18 7.72 17 7.72 17 9.53 21     3 ½ 
4 254 146.1 157.2 30.2 31.8 102.4 116.1 116.8 117.6 84.3 46.2 47.8 114.3 11.2 33.3 23.9 200.2 8 22.4 ¾ 95.3 114.3 127 11.3 24.9 10.13 22.3 10.07 22.2 12 26.5     4
5 279 177.8 185.7 33.5 35.1 128.3 143.8 144.5 144.5 97.0 49.2 50.8 141.2 11.2 36.6 23.9 235 8 22.4 ¾ 108 120.7 133.4 15.12 33.3 12.58 27.7 12.52 27.6 15.96 35.2     5
6 318 206.2 215.9 35.0 36.6 154.2 170.7 171.5 171.5 97.0 50.7 52.3 168.4 12.7 39.6 26.9 269.7 12 22.4 ¾ 108 120.7 139.7 19.68 43.4 16.04 35.4 15.95 35.2 21.2 46.7     6
8 381 260.4 269.7 39.5 41.1 202.7 221.5 222.3 222.3 109.7 60.4 62.0 219.2 12.7 44.5 31.8 330.2 12 25.4 8-Jul 120.7 139.7 152.4 30.48 67.2 24.5 54 24.37 53.7 34.6 76.3     8
10 445 320.5 323.9 46.2 47.8 254.5 276.4 277.4 276.4 115.7 64.9 95.3 273.1 12.7 49.3 33.3 387.4 16 28.4 1 139.7 158.8 171.5 43.47 96.4 34.16 75.3 39.92 88 55.34 122     10
12 521 374.7 381.0 49.2 50.8 304.8 327.2 328.2 328.7 128.4 71.6 101.6 323.9 12.7 55.6 39.6 450.9 16 31.8 1 1/8 146.1 171.5 184.2 64.41 142 51.26 113 58.7 129.4 78.9 174     12
14 584 425.5 412.8 52.2 53.8 336.6 359.2 360.2 360.4 141.4 74.6 111.3 355.6 12.7 57.2 41.4 514.4 20 31.8 1 1/8 158.8 177.8 190.5 88.3 194.7 72.12 159 83.46 184 107.05 236     14
16 648 482.6 469.9 55.6 57.2 387.4 410.5 411.2 411.2 144.5 81.0 120.7 406.4 12.7 63.5 44.5 571.5 20 35.1 1 ¼ 165.1 190.5 203.2 112.94 249 90.4 199.3 106.14 234 139.25 307     16
18 711 533.4 533.4 58.9 60.5 438.2 461.8 462.3 462.0 157.2 87.3 130.0 457.2 12.7 68.3 49.3 628.7 24 35.1 1 ¼ 171.5 196.9 209.6 138.34 305 109 240.3 133.95 295.3 176.9 396     18
20 775 587.2 584.2 61.9 63.5 489.0 513.1 514.4 512.8 160.5 93.7 139.7 508.0 12.7 73.2 54.1 568.8 24 35.1 1 ¼ 184.2 203.2 222.3 167.37 369 136 300 157.65 347.6 223.17 492     20
24 914 701.5 692.2 68.3 69.9 590.6 616.0 616.0 614.4 166.5 104.8 152.4 609.6 12.7 82.6 63.5 812.8 24 41.1 1 ½ 203.2 228.6 254 235.41 519 204 449.7 240.4 530 342 754     24
Notes:
(1) For the Bore (B1) other than Standard wall thickness, refer to page 56.
(2) Class 300 flanges except lap Joint will be furnished with 0.06" (1.6mm) raised face, which is included in Thickness (t) and length through Hub (T1), (T2)
(3) For Slip-on, Threaded, Socket welding and lap joint Flanges, the hubs can be shaped either vertical from base to top or rapered within the limits of 7 degrees.
(4) Blind Flanges may be made with the same hub as that used for slip-on Flanges or without hub.
(5) The gasket surface and backside (bearing surface for bolting) are made parallel within 1 degree, to accomplish parallelism.
spot facing is carried out according to MSS SP-9 without reducing thickness(t).
(6) Depth of Socket (Y) is covered bu ANSI B16.5 only in sizes through 3 inch, over 3 inch is at the manufacturers option.