Weld Neck Flanges Dimensions （INCH）

Weld Neck Flanges Dimensions

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Standard ASME B16.5
PRESSURE CLASSES 150, 300, 400, 600, 900 , 1500, 2500
Chart unit description
H: Total flange height  (  Inch)
B: Flange thickness (Inch)
L: Bolt hole diameter (Inch)
OD: Flange welding end outer diameter (Inch)
A: Flange large neck outer diameter
K: Bolt hole center distance
D： Flange  outer diameter (Inch)
PRESSURE CLASSES 150
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 3.5 0.38 1.19 0.84 1.81 2.38  5/8 4  1/2 2.25
 3/4 3.88 0.44 1.5 1.05 2 2.75  5/8 4  1/2 2.5
1 4.25 0.5 1.94 1.32 2.12 3.12  5/8 4  1/2 2.5
1.1/4 4.62 0.56 2.31 1.66 2.19 3.5  5/8 4  1/2 2.75
1.1/2 5 0.62 2.56 1.9 2.38 3.88  5/8 4  1/2 2.75
2.00 6 0.69 3.06 2.38 2.44 4.75  3/4 4  5/8 3.25
2.1/2 7 0.81 3.56 2.88 2.69 5.5  3/4 4  5/8 3.5
3.00 7.5 0.88 4.25 3.5 2.69 6  3/4 4  5/8 3.5
3.1/2 8.5 0.88 4.81 4 2.75 7  3/4 8  5/8 3.5
4.00 9 0.88 5.31 4.5 2.94 7.5  3/4 8  5/8 3.5
5.00 10 0.88 6.44 5.56 3.44 8.5  7/8 8  3/4 3.75
6.00 11 0.94 7.56 6.63 3.44 9.5  7/8 8  3/4 4
8.00 13.5 1.06 9.69 8.63 3.94 11.75  7/8 8  3/4 4.25
10.00 16 1.12 12 10.75 3.94 14.25 1 12  7/8 4.5
12.00 19 1.19 14.38 12.75 4.44 17 1 12  7/8 4.75
14.00 21 1.31 15.75 14 4.94 18.75 1.1/8 12 1 5.25
16.00 23.5 1.38 18 16 4.94 21.25 1.1/8 16 1 5.25
18.00 25 1.5 19.88 18 5.44 22.75 1.1/4 16 1.1/8 5.75
20.00 27.5 1.62 22 20 5.62 25 1.1/4 20 1.1/8 6.25
24.00 32 1.81 26.12 24 5.94 29.5 1.3/8 20 1.1/4 6.75
PRESSURE CLASSES 300
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 3.75 0.5 1.5 0.84 2 2.62  5/8 4  1/2 2.5
 3/4 4.62 0.56 1.88 1.05 2.19 3.25  3/4 4  5/8 3
1 4.88 0.62 2.12 1.32 2.38 3.5  3/4 4  5/8 3
1.1/4 5.25 0.69 2.5 1.66 2.5 3.88  3/4 4  5/8 3.25
1.1/2 6.12 0.75 2.75 1.9 2.63 4.5  7/8 4  3/4 3.5
2.00 6.5 0.81 3.31 2.38 2.69 5  3/4 8  5/8 3.5
2.1/2 7.5 0.94 3.94 2.88 2.94 5.88  7/8 8  3/4 4
3.00 8.25 1.06 4.62 3.5 3.06 6.62  7/8 8  3/4 4.25
3.1/2 9 1.12 5.25 4 3.13 7.25  7/8 8  3/4 4.25
4.00 10 1.19 5.75 4.5 3.32 7.88  7/8 8  3/4 4.5
5.00 11 1.31 7 5.56 3.82 9.25  7/8 8  3/4 4.75
6.00 12.5 1.38 8.12 6.63 3.82 10.62  7/8 12  3/4 4.75
8.00 15 1.56 10.25 8.63 4.32 13 1 12  7/8 5.5
10.00 17.5 1.81 12.62 10.75 4.56 15.25 1.1/8 16 1 6.25
12.00 20.5 1.94 14.75 12.75 5.06 17.75 1.1/4 16 1.1/8 6.75
14.00 23 2.06 16.75 14 5.56 20.25 1.1/4 20 1.1/8 7
16.00 25.5 2.19 19 16 5.69 22.5 1.3/8 20 1.1/4 7.5
18.00 28 2.31 21 18 6.19 24.75 1.3/8 24 1.1/4 7.75
20.00 30.5 2.44 23.12 20 6.32 27 1.3/8 24 1.1/4 8
24.00 36 2.69 27.62 24 6.56 32 1.5/8 24 1.1/2 9
PRESSURE CLASSES 400
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 3.75 0.56 1.5 0.84 2.06 2.62  5/8 4  1/2 3
 3/4 4.62 0.62 1.88 1.05 2.25 3.25  3/4 4  5/8 3.5
1 4.88 0.69 2.12 1.32 2.44 3.5  3/4 4  5/8 3.5
1.1/4 5.25 0.81 2.5 1.66 2.62 3.88  3/4 4  5/8 3.75
1.1/2 6.12 0.88 2.75 1.9 2.75 4.5  7/8 4  3/4 4.25
2.00 6.5 1 3.31 2.38 2.88 5  3/4 8  5/8 4.25
2.1/2 7.5 1.12 3.94 2.88 3.12 5.88  7/8 8  3/4 4.75
3.00 8.25 1.25 4.62 3.5 3.25 6.62  7/8 8  3/4 5
3.1/2 9 1.38 5.25 4 3.38 7.25  7/8 8  7/8 5.5
4.00 10 1.38 5.75 4.5 3.5 7.88  7/8 8  7/8 5.5
5.00 11 1.5 7 5.56 4 9.25  7/8 8  7/8 5.75
6.00 12.5 1.62 8.12 6.63 4.06 10.62  7/8 12  7/8 6
8.00 15 1.88 10.25 8.63 4.62 13 1 12 1 6.75
10.00 17.5 2.12 12.62 10.75 4.88 15.25 1.1/8 16 1.1/8 7.5
12.00 20.5 2.25 14.75 12.75 5.38 17.75 1.1/4 16 1.1/4 8
14.00 23 2.38 16.75 14 5.88 20.25 1.1/4 20 1.1/4 8.25
16.00 25.5 2.5 19 16 6 22.5 1.3/8 20 1.3/8 8.75
18.00 28 2.62 21 18 6.5 24.75 1.3/8 24 1.3/8 9
20.00 30.5 2.75 23.12 20 6.62 27 1.3/8 24 1.1/2 9.5
24.00 36 3 27.62 24 6.88 32 1.5/8 24 1.3/4 10.5
PRESSURE CLASSES 600
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 3.75 0.56 1.5 0.84 2.06 2.62  5/8 4  1/2 3
 3/4 4.62 0.62 1.88 1.05 2.25 3.25  3/4 4  5/8 3.5
1 4.88 0.69 2.12 1.32 2.44 3.5  3/4 4  5/8 3.5
1.1/4 5.25 0.81 2.5 1.66 2.62 3.88  3/4 4  5/8 3.75
1.1/2 6.12 0.88 2.75 1.9 2.75 4.5  7/8 4  3/4 4.25
2 6.5 1 3.31 2.38 2.88 5  3/4 8  5/8 4.25
2.1/2 7.5 1.12 3.94 2.88 3.12 5.88  7/8 8  3/4 4.75
3 8.25 1.25 4.62 3.5 3.25 6.62  7/8 8  3/4 5
3.1/2 9 1.38 5.25 4 3.38 7.25 1 8  7/8 5.5
4 10.75 1.5 6 4.5 4 8.5 1 8  7/8 5.5
5 13 1.75 7.44 5.56 4.5 10.5 1.1/8 8 1 6.5
6 14 1.88 8.75 6.63 4.62 11.5 1.1/8 12 1 6.75
8 16.5 2.19 10.75 8.63 5.25 13.75 1.1/4 12 1.1/8 7.5
10 20 2.5 13.5 10.75 6 17 1.3/8 16 1.1/4 8.5
12 22 2.62 15.75 12.75 6.12 19.25 1.3/8 20 1.1/4 8.75
14 23.75 2.75 17 14 6.5 20.75 1.1/2 20 1.3/8 9.25
16 27 3 19.5 16 7 23.75 1.5/8 20 1.1/2 10
18 29.25 3.25 21.5 18 7.25 25.75 1.3/4 20 1.5/8 10.75
20 32 3.5 24 20 7.5 28.5 1.3/4 24 1.5/8 11.25
24 37 4 28.25 24 8 33 2 24 1.7/8 13
PRESSURE CLASSES 900
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 4.75 0.88 1.5 0.84 2.38 3.25  7/8 4  3/4 4.25
 3/4 5.12 1 1.75 1.05 2.75 3.5  7/8 4  3/4 4.5
1 5.88 1.12 2.06 1.32 2.88 4 1 4  7/8 5
1.1/4 6.25 1.12 2.5 1.66 2.88 4.38 1 4  7/8 5
1.1/2 7 1.25 2.75 1.9 3.25 4.88 1.1/8 4 1 5.5
2 8.5O 1.5 4.12 2.38 4 6.5 1 8  7/8 5.75
2.1/2 9.62 1.62 4.88 2.88 4.12 7.5 1.1/8 8 1 6.25
3 9.5 1.5 5 3.5 4 7.5 1 8  7/8 5.75
4 11.5 1.75 6.25 4.5 4.5 9.25 1.1/4 8 1.1/8 6.75
5 13.75 2 7.5 5.56 5 11 1.3/8 8 1.1/4 7.5
6 15 2.19 9.25 6.63 5.5 12.5 1.1/4 12 1.1/8 7.5
8 18.5 2.5 11.75 8.63 6.38 15.5 1.1/2 12 1.3/8 8.75
10 21.5 2.75 14.5 10.75 7.25 18.5 1.1/2 16 1.3/8 9.25
12 24 3.12 16.5 12.75 7.88 21 1.1/2 20 1.3/8 10
14 25.25 3.38 17.75 14 8.38 22 1.5/8 20 1.1/2 10.75
16 27.75 3.5 20 16 8.5 24.25 1.3/4 20 1.5/8 11.25
18 31 4 22.25 18 9 27 2 20 1.7/8 12.75
20 33.75 4.25 24.5 20 9.75 29.5 2.1/8 20 2 13.75
24 41 5.5 29.5 24 11.5 35.5 2.5/8 20 2.1/2 17.25
PRESSURE CLASSES 1500
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 4.75 0.88 1.5 0.84 2.38 3.25  7/8 4  3/4 4.25
 3/4 5.12 1 1.75 1.05 2.75 3.5  7/8 4  3/4 4.5
1 5.88 1.12 2.06 1.32 2.88 4 1 4  7/8 5
1.1/4 6.25 1.12 2.5 1.66 2.88 4.38 1 4  7/8 5
1.1/2 7 1.25 2.75 1.9 3.25 4.88 1.1/8 4 1 5.5
2 8.5O 1.5 4.12 2.38 4 6.5 1 8  7/8 5.75
2.1/2 9.62 1.62 4.88 2.88 4.12 7.5 1.1/8 8 1 6.25
3 10.5 1.88 5.25 3.5 4.62 8 1.1/4 8 1.1/8 7
4 12.25 2.12 6.38 4.5 4.88 9.5 1.3/8 8 1.1/4 7.75
5 14.75 2.88 7.75 5.56 6.12 11.5 1.5/8 8 1.1/2 9.75
6 15.5 3.25 9 6.63 6.75 12.5 1.1/2 12 1.3/8 10.25
8 19 3.62 11.5 8.63 8.38 15.5 1.3/4 12 1.5/8 11.5
10 23 4.25 14.5 10.75 10 19 2 12 1.7/8 13.25
12 26.5 4.88 17.75 12.75 11.12 22.5 2.1/8 16 2 14.75
14 29.5 5.25 19.5 14 11.75 25 2.3/8 16 2.1/4 16
16 32.5 5.75 21.75 16 12.25 27.75 2.5/8 16 2.1/2 17.5
18 36 6.38 23.5 18 12.88 30.5 2.7/8 16 2.3/4 19.5
20 38.75 7 25.25 20 14 32.75 3.1/8 16 3 21.25
24 46 8 30 24 16 39 3.5/8 16 3.1/2 24.25
PRESSURE CLASSES 2500
NPS Dia THK Dia Dia Height Dia Dia No of
Bolt
Holes		 Dia
Stud
Bolts		 Length
Stud
Bolts
D B A OD H K L
 1/2 5.25 1.19 1.69 0.84 2.88 3.5  7/8 4  3/4 4.75
 3/4 5.5 1.25 2 1.05 3.12 3.75  7/8 4  3/4 5
1 6.25 1.38 2.25 1.32 3.5 4.25 1 4  7/8 5.5
1.1/4 7.25 1.5 2.88 1.66 3.75 5.12 1.1/8 4 1 6
1.1/2 8 1.75 3.12 1.9 4.38 5.75 1.1/4 4 1.1/8 6.75
2 9.25 2 3.75 2.38 5 6.75 1.1/8 8 1 7
2.1/2 10.5 2.25 4.5 2.88 5.62 7.75 1.1/4 8 1.1/8 7.75
3 12 2.62 5.25 3.5 6.62 9 1.3/8 8 1.1/4 8.75
4 14 3 6.5 4.5 7.5 10.75 1.5/8 8 1.1/2 10
5 16.5 3.62 8 5.56 9 12.75 1.7/8 8 1.3/4 11.75
6 19 4.25 9.25 6.63 10.75 14.5 2.1/8 8 2 13.5
8 21.75 5 12 8.63 12.5 17.25 2.1/8 12 2 15
10 26.5 6.5 14.75 10.75 16.5 21.25 2.5/8 12 2.1/2 19.25
12 30 7.25 17.38 12.75 18.25 24.38 2.7/8 12 2.3/4 21.25
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