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ANSI B16.5
Weld Neck Flanges

Class 300 lb

 
Pipe Flange Data Hub Data Raised Face Drilling Data Weight
Nominchal Pipe Size   A B C D E F G H I J  
Outside Diameter Overall Diameter Inside Diameter Flange Thickness rninch Overall Length Diameter at Weld Bevel Hub Diameter Face Diameter Number of Holes Bolt Hole Diameter Diameter of Circle of Holes kg/ piece
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
½ 0.840 21.30 3.750 95.20 0.620
15.70
0.560 14.20 2.060 52.30 0.840 21.30 1.500 38.10 1.380 35.00 4 0 620 15.70 2 620 66.55 0.75
¾ 1.050 26.70 4.620 117.3 0.820
20.80
0.620 15.70 2.250 57.15 1.050 26.70 1.880 47.70 1.690 42.90 4 0.750 19.00 3.250 82.50 1.26
1 1.315 33.40 4.880 123.9 1.050
26.70
0.690 17.50 2.440 62.00 1.320 33.50 2.120 53.80 2.000 50.80 4 0.750 19.00 3.500 88.90 1.52
1¼ 1.660 42.20 5.250 133.3 1.380
35,10
0.750 19.00 2.560 65.00 1.660 42.20 2.500 63.50 2.500 63.50 4 0.750 19.00 3.880 98.50 2.03
1½ 1.900 48.30 6.120 155.4 1.610
40.90
0.810 20.60 2.690 68.30 1.900 48.30 2.750 69.85 2.880 73.15 4 0.880 22.30 4.500 114,3 2.89
2 2.375 60.30 6.500 165.1 2.070
52.60
0.880 22.30 2.750 69.85 2.380 60.45 3.310 84.00 3.620 91.90 8 0.750 19.00 5.000 127.0 3.40
2½ 2.875 73.00 7.500 190.5 2.470
62.70
1.000 25.40 3.000 76.20 2.880 73.15 3.940 100.0 4.120 104.6 8 0.880 22.30 5.880 149.3 5.17
3 3.500 88.90 8.250 209.5 3.070
78.00
1.120 28.40 3.120 79.25 3.500 88.90 4.620 117.3 5.000 127.0 8 0.880 22.30 6.620 168.1 6.93
3½ 4.000 101.6 9.000 228.6 3.550
90.20
1.190 30.20 3.190 81.00 4.000 101.6 5.250 133.3 5.500 139.7 8 0.880 22.30 7.250 184.1 8.67
4 4.500 114.3 10.00 254.0 4.030
102.4
1.250 31.70 3.380 85.80 4.500 114.3 5.750 146.0 6.190 157.2 8 0 880 22.30 7.880 200.1 11.2
5 5.563 141.3 11.00 279.4 5.050
128.3
1.380 35.00 3.880 98.50 5.560 141.2 7.000 177.8 7.310 185.7 8 0 880 22.30 9.250 234.9 15.1
6 6.625 168.3 12.50 317.5 6.070
154.2
1.440 36.50 3.880 98.50 6.630 168.4 8.120 206.2 8.500 215.9 12 0.880 22.30 10.62 269.7 19.1
8 8.625 219.1 15.00 381.0 7.980
202.7
1.620 41.10 4.380 111.2 8.630 219.2 10.25 260.3 10.62 269.7 12 1.000 25.40 13.00 330.2 29.9
10 10.75 273.0 17.50 444.5 10.02
254.5
1.880 47.70 4.620 117.3 10.75 273.0 12.62 320.5 12.75 323.8 16 1.120 28.40 15.25 387.3 42.7
12 12.75 323.8 20.50 520.7 12.00
304.8
2.000 50.80 5.120 130.0 12.75 323.8 14.75 374.6 15.00 381.0 16 1.250 31.70 17.75 450.8 61.8
14 14.00 355.6 23.00 584.2 To be specified by Purchaser 2.120 53.80 5.620 142.7 14.00 355.6 16.75 425.4 16.25 412.7 20 1.250 31.70 20.25 514,3 85.8
16 16.00 406.4 25.50 647.7 2.250 57.15 5.750 146.0 16.00 406.4 19.00 482.6 18.50 469.9 20 1.380 35.00 22.50 571,5 106
18 18.00 457.2 28.00 711.2 2.380 60.45 6.250 158.7 18.00 457.2 21.00 533.4 21.00 533.4 24 1.380 35.00 24.75 628.6 131
20 20.00 508.0 30.50 774.7 2.500 63.50 6.380 162.0 20.00 508.0 23.12 587.2 23.00 584.2 24 1.380 35.00 27.00 685.8 158
24 24.00 6096 36.00 914.4 2.750 69.85 6.620 168.1 24.00 609.6 27.62 701.5 27.25 692.1 24 1.620 41.10 32.00
812.8
230
Notes
- Dimension B corresponds to the pipe inchside diameter. Values quoted assume 40S/Standard wall thickness
- Weights are based on manufacturer's data and are approximate.
- Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard).

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