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Weld Neck Flange

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ASTM-A-182
ASME-SA-182

ANSI Class Forged

Type 304/304L Green
Type 316/316L Brown

150 lb. Dimensions

Nominal Pipe size Flange Hub Raised Face g mm. Inches Drilling Template Approx. weight Kg. Pounds
D mm. Inches J mm. Inches b mm. Inches h mm. Inches a mm. Inches m mm. Inches Number l mm. Inches k mm. Inches
1/2″ 88.9 15.75 11.1 47.6 21.3 30.2 34.9 4 15.9 60.3 0.9
3 1/2 0.62 7/16 1 7/8 0.84 1 3/16 1 3/8 5/8 2 3/8 2
3/4″ 98.4 20.8 12.7 52.4 26.7 38.1 42.9 4 15.9 69.8 0.9
3 7/8 0.82 1/2 2 1/16 1.05 1 1/2 1 11/16 5/8 2 3/4 2
1″ 107.9 26.7 14.3 55.6 33.5 49.2 50.8 4 15.9 79.4 1.4
4 1/4 1.05 9/16 2 3/16 1.32 1 15/16 2 5/8 3 1/8 3
11/4″ 117.5 35.05 15.9 57.1 42.2 58.7 63.5 4 15.9 86.9 1.4
4 5/8 1.38 5/8 2 1/4 1.66 2 5/16 2 1/2 5/8 3 1/2 3
11/2″ 127 40.9 17.5 61.9 48.3 65.1 73 4 15.9 98.4 1.8
5 1.61 11/16 2 7/16 1.9 2 9/16 2 7/8 5/8 3 7/8 4
2″ 152.4 52.6 19.1 63.5 60.4 77.8 92.1 4 19.05 120.6 2.7
6 2.07 3/4 2 1/2 2.38 3 1/16 3 5/8 3/4 2 1/2 6
21/2″ 177.8 62.7 22.2 69.8 73.1 90.5 104.8 4 19 139.7 3.6
7 2.47 7/8 2 3/4 2.88 3 9/16 4 1/8 3/4 5 1/2 8
3″ 190.5 78 23.8 69.8 88.9 107.9 127 4 19.05 152.4 4.5
7 1/2 3.07 15/16 2 3/4 3.5 4 1/4 5 3/4 6 10
31/2″ 215.9 90.2 23.8 71.4 101.6 122.2 139.7 8 19.05 177.8 5.4
8 1/2 3.55 15/16 2 13/16 4 4 13/16 5 1/2 3/4 7 12
4″ 228.6 102.4 23.8 76.2 114.3 134.9 157.2 8 19.05 190.5 6.8
9 4.03 15/16 3 4.5 5 5/16 6 3/16 3/4 7 1/2 15
5″ 254 128.3 23.8 88.9 141.2 163.5 185.7 8 22.2 215.5 8.6
10 5.05 15/16 3 1/2 5.56 6 7/16 7 5/16 7/8 8 1/2 19
6″ 279.4 154.2 25.4 88.9 168.4 292.1 215.9 8 22.2 241.3 10.9
11 6.07 1 3 1/2 6.63 7 9/16 8 1/2 7/8 9 1/2 24
8″ 342.9 202.7 28.6 101.6 219.2 246.1 269.9 8 22.2 298.4 17.7
13 1/2 7.98 1 1/8 4 8.63 9 11/16 10 5/8 7/8 11 3/4 39
10″ 406.4 254.5 30.2 101.6 273 304.8 323.8 12 25.4 361.9 23.6
16 10.02 1 15/16 4 10.75 12 12 3/4 1 14 1/4 52
12″ 482.6 304.8 31.8 114.3 323.8 365.1 381 12 25.4 431.8 36.3
19 12 1 1/4 4 1/2 12.75 14 3/8 15 1 17 80
14″ 533.4 To be specified by purchaser 34.9 127.0 355.6 400 412.7 12 28.6 476.2 50
21 1 3/8 5 14 15 3/4 16 1/4 1 1/8 18 3/4 110
16″ 596.9 36.5 127.0 406.4 457.2 469.9 16 28.6 539.7 64
23 1/2 1 7/16 5 16 18 18 1/2 1 1/8 21 1/4 140
18″ 635 39.7 139.7 457.2 504.8 533.4 16 31.7 577.8 68
25 1 9/16 5 1/2 18 19 7/8 21 1 1/4 22 3/4 150
20″ 698.5 42.9 144.5 506 558.8 584.2 20 31.7 635 81.6
27 1/2 1 11/16 5 11/16 20 22 23 1 1/4 25 180
22″ 749.3 46 149.2 558.8 616 641.2 20 34.9 692.1 102
29 1/2 1 13/16 5 7/8 22 24 1/4 25 1/4 1 3/8 27 1/4 225
24″ 812.8 37.6 152.4 609.6 663.6 692.1 20 34.9 749.3 118
32 1 7/8 6 24 26 1/8 27 1/4 1 3/8 29 1/2 260

Click to download Stainless Steel Weld Neck Flange PDF

300 lb. Dimensions

Nominal Pipe size Flange Hub Raised Face g mm. Inches Drilling Template Approx. weight Kg. Pounds
D mm. Inches J mm. Inches b mm. Inches h mm. Inches a mm. Inches m mm. Inches Number l mm. Inches k mm. Inches
1/2″ 95.2 15.75 14.3 52.4 21.3 38.1 34.9 4 15.9 66.7 0.9
3 3/4 0.62 9/16 2 1/16 0.84 1 1/2 1 3/8 5/8 2 5/8 2
3/4″ 117.5 20.8 15.9 57.1 26.7 47.6 42.9 4 19.05 82.5 1.4
4 5/8 0.82 5/8 2 1/4 1.05 1 7/8 1 11/16 3/4 3 1/4 3
1″ 123.8 26.7 17.5 61.9 33.5 54 50.8 4 19.05 88.9 1.8
4 7/8 1.05 11/16 2 7/16 1.32 2 1/8 2 3/4 3 1/2 4
11/4″ 133.35 35.05 19.05 65.1 42.2 63.5 63.5 4 19.05 98.4 2.3
5 1/4 1.38 3/4 2 9/16 1.66 2 1/2 2 1/2 3/4 3 7/8 5
11/2″ 155.6 40.9 20.6 68.3 48.3 69.8 73 4 22.2 114.3 3.2
6 1/8 1.61 13/16 2 1/16 1.9 2 3/4 2 &/8 7/8 4 1/2 7
2″ 165.1 52.6 22.2 69.8 60.45 84.1 92.1 8 19.05 127 4.1
6 1/2 2.07 7/8 2 3/4 2.38 3 5/16 3 5/8 3/4 5 9
21/2″ 190.5 62.7 25.4 76.2 73.15 100 104.8 8 22.2 149.2 5.4
7 1/2 2.47 1 3 2.88 3 15/16 4 1/8 7/8 8 1/2 12
3″ 209.55 78 28.6 79.4 88.9 117.5 127 8 22.2 168.3 6.8
8 1/4 3.07 1 1/8 3 1/8 3.5 4 5/8 5 7/8 6 5/8 15
31/2″ 228.6 90.2 30.2 81.0 101.6 133.5 139.7 8 22.2 184.15 8.2
9 3.55 1 3/16 3 3/16 4 5 1/4 5 1/2 7/8 7 1/4 18
4″ 254 102.4 31.8 85.7 114.3 146.05 157.2 8 22.2 200 11.3
10 4.03 1 1/4 3 3/8 4.5 5 3/4 6 3/16 7/8 7 7/8 25
5″ 279.4 128.3 34.9 98.4 141.2 177.8 185.7 8 22.2 234.95 14.5
11 5.05 1 3/8 3 7/8 5.56 7 7 5/16 7/8 9 1/4 32
6″ 317.5 154.2 36.5 98.4 168.4 206.4 215.9 12 22.2 269.9 19
12 1/2 6.07 1 7/16 3 7/8 6.63 8 1/8 8 1/2 7/8 10 5/8 42
8″ 381 202.7 41.3 111.1 219.2 260.35 269.9 12 25.4 330.2 30.4
15 7.98 1 5/8 4 3/8 8.63 10 1/4 10 5/8 1 13 67
10″ 444.5 254.5 47.6 117.5 273 320.7 323.8 16 28.6 387.3 41.3
17 1/2 10.02 1 7/8 4 5/8 10.75 12 5/8 12 3/4 1 1/8 15 1/4 91
12″ 520.7 304.8 50.8 130.2 323.85 374.6 381 16 31.7 450.8 63.5
20 1/2 12 2 5 1/8 12.75 14 3/4 15 1 1/4 17 3/4 140
14″ 584.2 To be specified by purchaser 54 142.9 355.6 425.4 412.7 20 31.7 514.3 81.6
23 2 1/8 5 5/8 14 16 3/4 16 1/4 1 1/4 20 1/4 180
16″ 647.7 57.2 146.1 406.4 482.6 469.9 20 34.9 571.5 113
25 1/2 2 1/4 5 3/4 16 19 18 1/2 1 3/8 22 1/2 250
18″ 711.2 60.3 158.8 457.2 533.4 533.4 24 34.9 628.6 145
28 2 3/8 6 1/4 18 21 21 1 3/8 24 3/4 320
20″ 774.7 63.5 161.9 506 587.4 584.2 24 34.9 685.8 181
30 1/2 2 1/2 6 3/8 20 23 1/8 23 1 3/8 27 400
22″ 838.2 66.7 165.1 558.8 641.2 641.2 24 41.3 742.9 211
33 2 5/8 6 1/2 22 25 1/4 25 1/4 1 5/8 29 1/4 465
24″ 914.4 69.8 168.3 609.6 701.7 692.1 24 41.3 812.8 263
36 2 3/4 6 5/8 24 27 5/8 27 1/4 1 5/8 32 580

Click to download Stainless Steel Weld Neck Flange PDF

Weld-Neck Tolerances

Dimensions Class Tolerances
inches mm
D Outside

Diameter*

D ≤ 610mm/OD ≤ 24″ ± 0.06″ ± 1.60mm
D > 610mm/OD > 24″ ± 0.12″ ± 3.20mm
j Inside

Diameter

NPS ≤ 10″ ± 0.03″ ± 0.80mm
12″ ≤ NPS ≤ 18″ ± 0.06″ ± 1.60mm
NPS ≥ 20″ + 0.12″, – 0.06″ + 3.20mm, – 0.06mm
g Diameter of

Contact Face

1.60mm (0.06″) Raised Face ± 0.03″ ± 0.80mm
6.40mm (0.25″) Raised Face ± 0.02″ ± 0.50mm
m Outside Diameter

of Hub at base *

m ≤ 610mm (24″) ± 0.06″ + 1.60mm
m > 610mm (24″) ± 0.12″ + 3.20mm
a Diameter of Hub

at point of Welding

NPS ≤ 5″ + 0.09″, – 0.03″ + 2.40mm, – 0.80mm
NPS ≥ 6″ + 0.16″, – 0.03″ + 4.00mm, – 0.80mm
k Bolt Circle

Diameter

± 0.06″ ± 1.60mm
Center to center of

adjacent bolt holes

± 0.03″ ± 0.80mm
Excentricity between

bolt circle diameter

and machined

facing diameters.

NPS ≤ 2 1/2″ ± 0.03″ ± 0.80mm
NPS ≥ 3″ ± 0.06″ ± 1.60mm
l Drilling * ± 0.03″ ± 0.80mm
h Overall Length

through Hub

NPS ≤ 4″ ± 0.06″ ± 1.60mm
5″ ≤ NPS ≤ 10″ + 0.06″, – 0.12″ + 1.60mm, – 3.20mm
NPS ≥ 12″ + 0.12″, – 0.18″ + 3.20mm, – 4.80mm
b Thickness NPS ≤ 18″ + 0.12″, – 0″ + 3.20mm, – 0.0mm
NPS ≥ 20″ + 0.19″, – 0″ + 4.80mm, – 0.0mm

Click to download Stainless Steel Weld Neck Flange PDF

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