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ASME B16.5 Stainless Steel Weld Neck Flange

The smooth transition between the flange and the hub combined with the strength of the butt weld joint, allows the flange to be used in extreme conditions of cyclic loading, bending and temperature fluctuations.

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Weld neck flanges are the most popular type of flanges with a weld bevel at the end of the neck extension. This type of flange is designed to be butt welded directly to the pipe to provide a superior and relatively natural form connection. In larger sizes and higher pressure ratings, this is almost the only type of flange connection used. If only one drilled flange style exists in modern applications, the weld neck flange will be your flange of choice.

Shape Weld Neck Flange ( WN),Slip-on Flange (SO), Threaded Flange (THD),Socket Weld Flange (SW),Blind Flange (BL),Lap Joint Flange (LAPJ),Plate flange (PL)
Size Range 1/2″ – 48″/ DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME B16.5, ASME B16.47 Series A/B, EN 1092-1, API 605, MSS SP-44, DIN 2627, DIN 2527, DIN 2558, DIN 2576, DIN 2641, DIN 2655, DIN 2656, DIN2573
Carbon Steel ASTM A105 / A105N, ASTM A350 LF2/LF3, ASTM A694 F42 / 46 / 56 / 60 / 65, P235GH, P265GH, P280GH, P355GH
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317,347,904L, 1.4404, 1.4437.
Duplex Stainless Steel ASTM A182 F51, F53, F44

This kind of flange include lots of specification, Weld neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline.

This allows gas or liquid within the piping assembly to flow through the flange connection with minimal restriction. Check this welded bevel connection after the welding procedure to ensure an even seal and no abnormalities.

Class 150 lb Weld Neck Flange Dimensions & Weight 

NPS A B C D E F G H I J W
inch inch inch inch inch inch inch No. of Holes inch inch kg/pc
mm mm mm mm mm mm mm mm mm
1/2 3.500 0.620 0.440 1.880 0.840 1.190 1.380 4 0.620 2.380 0.48
88.90 15.70 11.20 47.80 21.30 30.20 35.00 15.70 60.45
3/4 3.880 0.820 0.500 2.060 1.050 1.500 1.690 4 0.620 2.750 0.71
98.60 20.80 12.70 52.30 26.70 38.10 42.90 15.70 69.85
1 4.250 1.050 0.560 2.190 1.320 1.940 2.000 4 0.620 3.120 1.01
108.0 26.70 14.20 55.60 33.50 49.30 50.80 15.70 79.25
1-1/4 4.620 1.380 0.620 2.250 1.660 2.310 2.550 4 0.620 3.500 1.33
117.3 35.10 15.70 57.15 42.20 58.70 63.50 15.70 88.90
1-1/2 5.000 1.610 0.690 2.440 1.900 2.560 2.880 4 0.620 3.880 1.72
127.0 40.90 17.50 62.00 48.30 65.00 73.15 15.70 98.60
2 6.000 2.070 0.750 2.500 2.380 3.060 3.620 4 0.750 4.750 2.58
152.4 52.60 19.10 63.50 60.45 77.70 91.90 19.10 120.7
2-1/2 7.000 2.470 0.880 2.750 2.880 3.560 4.120 4 0.750 5.500 4.11
177.8 62.70 22.40 69.85 73.15 90.40 104.6 19.10 139.7
3 7.500 3.070 0.940 2.750 3.500 4.250 5.000 4 0.750 6.000 4.92
190.5 78.00 23.90 69.85 88.90 108.0 127.0 19.10 152.4
3-1/2 8.500 3.550 0.940 2.810 4.000 4.810 5.500 8 0.750 7.000 6.08
215.9 90.20 23.90 71.40 101.6 122.2 139.7 19.10 177.8
4 9.000 4.030 0.940 3.000 4.500 5.310 6.190 8 0.750 7.500 6.84
228.6 102.4 23.90 76.20 114.3 134.9 157.2 19.10 190.5
5 10.00 5.050 0.940 3.500 5.560 6.440 7.310 8 0.880 8.500 8.56
254.0 128.3 23.90 88.90 141.2 163.6 185.7 22.40 215.9
6 11.00 6.070 1.000 3.500 6.630 7.560 8.500 8 0.880 9.500 10.6
279.4 154.2 25.4 88.90 168.4 192.0 215.9 22.40 241.3
8 13.50 7.980 1.120 4.000 8.630 9.690 10.62 8 0.880 11.75 17.6
342.9 202.7 28.40 101.6 219.2 246.1 269.7 22.40 298.5
10 16.00 10.02 1.190 4.000 10.75 12.00 12.75 12 1.000 14.25 24.0
406.4 254.5 30.20 101.6 273.0 304.8 323.8 25.40 362.0
12 19.00 12.00 1.250 4.500 12.75 14.38 15.00 12 1.000 17.00 36.5
482.6 304.8 31.75 114.3 323.8 365.3 381.0 25.40 431.8
14 21.00 1.380 5.000 14.00 15.75 16.25 12 1.120 18.75 48.4
533.4 35.10 127.0 355.6 400.1 412.7 28.40 476.3
16 23.50 1.440 5.000 16.00 18.00 18.50 16 1.120 21.25 60.6
596.9 36.60 127.0 406.4 475.2 469.9 28.40 539.8
18 25.00 1.560 5.500 18.00 19.88 21.00 16 1.250 22.75 68.3
635.0 39.60 139.7 457.2 505.0 533.4 31.75 577.9
20 27.50 1.690 5.690 20.00 22.00 23.00 20 1.250 25.00 84.5
698.5 42.90 144.5 508.0 558.8 584.2 31.75 635
24 32.00 1.880 6.000 24.00 26.12 27.25 20 1.380 29.50 115
812.8 47.80 152.4 609.6 663.4 692.1 35.10 749.3

Notes:

) Dimension B corresponds to the pipe inside diameter. Values quoted assume 40S/Standard wall thickness.

2) Weights are based on manufacturer’s data and are approximate .

3) Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard).

4) The blank space needs to be provided by purchaser.

5)  If you need class 300 ,600 ,900 ,1500 ,2500 flange dimensions & weight,please contact us

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