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Weld Neck Flange Dimensions (Cl. 150/300/900/1500/2500)

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The charts show the dimensions of weld neck flange class 150, 300, 400, 900, 1500, 2500 in inches and in millimeters (with dimensional tolerances).

WELDING NECK FLANGE DIMENSIONS IN INCHES

Welding Neck Flange Dimensions

WN CLASS 150 (IN INCH)

Weld neck flange dimensions class 150 (ASME B16.5) in inches

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
1/2″ 0.62″ 3.50″ 2.38″ 1.38″ .063″ 1.19″ 0.84″ 1.88″ .38″ 1.82″ .62″ 4
3/4″ 0.82″ 3.88″ 2.75″ 1.69″ .063″ 1.50″ 1.05″ 2.06″ .44″ 2.00″ .62″ 4
1″ 1.05″ 4.25″ 3.12″ 2.00″ .063″ 1.94″ 1.32″ 2.19″ .50″ 2.13″ .62″ 4
1-1/4″ 1.38″ 4.62″ 3.50″ 2.50″ .063″ 2.31″ 1.66″ 2.25″ .56″ 2.19″ .62″ 4
1-1/2″ 1.61″ 5.00″ 3.88″ 2.88″ .063″ 2.56″ 1.90″ 2.44″ .62″ 2.38″ .62″ 4
2″ 2.07″ 6.00″ 4.75″ 3.62″ .063″ 3.06″ 2.38″ 2.50″ .69″ 2.44″ .75″ 4
2-1/2″ 2.47″ 7.00″ 5.50″ 4.12″ .063″ 3.56″ 2.88″ 2.75″ .82″ 2.69″ .75″ 4
3″ 3.07″ 7.50″ 6.00″ 5.00″ .063″ 4.25″ 3.50″ 2.75″ .88″ 2.69″ .75″ 4
3-1/2″ 3.55″ 8.50″ 7.00″ 5.50″ .063″ 4.81″ 4.00″ 2.81″ .88″ 2.75″ .75″ 8
4″ 4.03″ 9.00″ 7.50″ 6.19″ .063″ 5.31″ 4.50″ 3.00″ .88″ 2.94″ .75″ 8
5″ 5.05″ 10.00″ 8.50″ 7.31″ .063″ 6.44″ 5.56″ 3.50″ .88″ 3.44″ .88″ 8
6″ 6.07″ 11.00″ 9.50″ 8.50″ .063″ 7.56″ 6.63″ 3.50″ .94″ 3.44″ .88″ 8
8″ 7.98″ 13.50″ 11.75″ 10.62″ .063″ 9.69″ 8.63″ 4.00″ 1.06″ 3.94″ .88″ 8
10″ 10.02″ 16.00″ 14.25″ 12.75″ .063″ 12.00″ 10.75″ 4.00″ 1.13″ 3.94″ 1.00″ 12
12″ 12.00″ 19.00″ 17.00″ 15.00″ .063″ 14.38″ 12.75″ 4.50″ 1.19″ 4.44″ 1.00″ 12
14″ 13.25″ 21.00″ 18.75″ 16.25″ .063″ 15.75″ 14.00″ 5.00″ 1.32″ 4.94″ 1.12″ 12
16″ 15.25″ 23.50″ 21.25″ 18.50″ .063″ 18.00″ 16.00″ 5.00″ 1.38″ 4.94″ 1.12″ 16
18″ 17.25″ 25.00″ 22.75″ 21.00″ .063″ 19.88″ 18.00″ 5.50″ 1.50″ 5.44″ 1.25″ 16
20″ 19.25″ 27.50″ 25.00″ 23.00″ .063″ 22.00″ 20.00″ 5.69″ 1.63″ 5.63″ 1.25″ 20
22″ 21.25″ 29.50″ 27.25″ 25.25″ .063″ 24.25″ 22.00″ 5.88″ 1.75″ 5.82″ 1.38″ 20
24″ 23.25″ 32.00″ 29.50″ 27.25″ .063″ 26.12″ 24.00″ 6.00″ 1.82″ 5.94″ 1.38″ 20

 

WN CLASS 300 (IN INCH)

Weld neck flange dimensions class 300 (ASME B16.5) in inches

Welding Neck Flange Dimensions

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
1/2″ 0.62″ 3.75″ 2.62″ 1.38″ .063″ 1.50″ 0.84″ 2.06″ .50″ 2.00″ 0.62″ 4
3/4″ 0.82″ 4.62″ 3.25″ 1.69″ .063″ 1.88″ 1.05″ 2.25″ .56″ 2.19″ 0.75″ 4
1″ 1.05″ 4.88″ 3.50″ 2.00″ .063″ 2.12″ 1.32″ 2.44″ .63″ 2.38″ 0.75″ 4
1-1/4″ 1.38″ 5.25″ 3.88″ 2.50″ .063″ 2.50″ 1.66″ 2.56″ .69″ 2.50″ 0.75″ 4
1-1/2″ 1.61″ 6.12″ 4.50″ 2.88″ .063″ 2.75″ 1.90″ 2.69″ .75″ 2.63″ 0.88″ 4
2″ 2.07″ 6.50″ 5.00″ 3.62″ .063″ 3.31″ 2.38″ 2.75″ .82″ 2.69″ 0.75″ 8
2-1/2″ 2.47″ 7.50″ 5.88″ 4.12″ .063″ 3.94″ 2.88″ 3.00″ .94″ 2.94″ 0.88″ 8
3″ 3.07″ 8.25″ 6.62″ 5.00″ .063″ 4.62″ 3.50″ 3.12″ 1.06″ 3.06″ 0.88″ 8
3-1/2″ 3.55″ 9.00″ 7.25″ 5.50″ .063″ 5.25″ 4.00″ 3.19″ 1.13″ 3.13″ 0.88″ 8
4″ 4.03″ 10.00″ 7.88″ 6.19″ .063″ 5.75″ 4.50″ 3.38″ 1.19″ 3.32″ 0.88″ 8
5″ 5.05″ 11.00″ 9.25″ 7.31″ .063″ 7.00″ 5.56″ 3.88″ 1.32″ 3.82″ 0.88″ 8
6″ 6.07″ 12.50″ 10.62″ 8.50″ .063″ 8.12″ 6.63″ 3.88″ 1.38″ 3.82″ 0.88″ 12
8″ 7.98″ 15.00″ 13.00″ 10.62″ .063″ 10.25″ 8.63″ 4.38″ 1.56″ 4.32″ 1.00″ 12
10″ 10.02″ 17.50″ 15.25″ 12.75″ .063″ 12.62″ 10.75″ 4.62″ 1.82″ 4.56″ 1.12″ 16
12″ 12.00″ 20.50″ 17.75″ 15.00″ .063″ 14.75″ 12.75″ 5.12″ 1.94″ 5.06″ 1.25″ 16
14″ 13.25″ 23.00″ 20.25″ 16.25″ .063″ 16.75″ 14.00″ 5.62″ 2.06″ 5.56″ 1.25″ 20
16″ 15.25″ 25.50″ 22.50″ 18.50″ .063″ 19.00″ 16.00″ 5.75″ 2.19″ 5.69″ 1.38″ 20
18″ 17.25″ 28.00″ 24.75″ 21.00″ .063″ 21.00″ 18.00″ 6.25″ 2.32″ 6.19″ 1.38″ 24
20″ 19.25″ 30.50″ 27.00″ 23.00″ .063″ 23.12″ 20.00″ 6.38″ 2.44″ 6.32″ 1.38″ 24
22″ 21.25″ 33.00″ 29.25″ 25.25″ .063″ 25.25″ 22.00″ 6.50″ 2.57″ 6.44″ 1.62″ 24
24″ 23.25″ 36.00″ 32.0″ 27.25″ .063″ 27.62″ 24.00″ 6.62″ 2.69″ 6.56″ 1.62″ 24

 

WN CLASS 400 (IN INCH)

Weld neck flange dimensions class 400 (ASME B16.5) in inches

Welding Neck Flange Dimensions

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
1/2″ .55″ 3.75″ 2.62″ 1.38″ .250″ 1.50″ 0.84″ 2.31″ 0.56″ 2.06″ 0.62″ 4
3/4″ .74″ 4.62″ 3.25″ 1.69″ .250″ 1.88″ 1.05″ 2.50″ 0.62″ 2.25″ 0.75″ 4
1″ .96″ 4.88″ 3.50″ 2.00″ .250″ 2.12″ 1.32″ 2.69″ 0.69″ 2.44″ 0.75″ 4
1-1/4″ 1.28″ 5.25″ 3.88″ 2.50″ .250″ 2.50″ 1.66″ 2.87″ 0.81″ 2.62″ 0.75″ 4
1-1/2″ 1.50″ 6.12″ 4.50″ 2.88″ .250″ 2.75″ 1.90″ 3.00″ 0.88″ 2.75″ 0.88″ 4
2″ 1.94″ 6.50″ 5.00″ 3.62″ .250″ 3.31″ 2.38″ 3.13″ 1.00″ 2.88″ 0.75″ 8
2-1/2″ 2.32″ 7.50″ 5.88″ 4.12″ .250″ 3.94″ 2.88″ 3.37″ 1.12″ 3.12″ 0.88″ 8
3″ 2.90″ 8.25″ 6.62″ 5.00″ .250″ 4.62″ 3.50″ 3.50″ 1.25″ 3.25″ 0.88″ 8
3-1/2″ 3.36″ 9.00″ 7.25″ 5.50″ .250″ 5.25″ 4.00″ 3.63″ 1.38″ 3.38″ 1.00″ 8
4″ 3.83″ 10.00″ 7.88″ 6.19″ .250″ 5.75″ 4.50″ 3.75″ 1.38″ 3.50″ 1.00″ 8
5″ 4.81″ 11.00″ 9.25″ 7.31″ .250″ 7.00″ 5.56″ 4.25″ 1.50″ 4.00″ 1.00″ 8
6″ 5.76″ 12.50″ 10.62″ 8.50″ .250″ 8.12″ 6.63″ 4.31″ 1.62″ 4.06″ 1.00″ 12
8″ 7.63″ 15.00″ 13.00″ 10.62″ .250″ 10.25″ 8.63″ 4.87″ 1.88″ 4.62″ 1.12″ 12
10″ 9.75″ 17.50″ 15.25″ 12.75″ .250″ 12.62″ 10.75″ 5.13″ 2.12″ 4.88″ 1.25″ 16
12″ 11.75″ 20.50″ 17.75″ 15.00″ .250″ 14.75″ 12.75″ 5.63″ 2.25″ 5.38″ 1.38″ 16
14″ 13.00″ 23.00″ 20.25″ 16.25″ .250″ 16.75″ 14.00″ 6.13″ 2.38″ 5.88″ 1.38″ 20
16″ 15.00″ 25.50″ 22.50″ 18.50″ .250″ 19.00″ 16.00″ 6.25″ 2.50″ 6.00″ 1.50″ 20
18″ 17.00″ 28.00″ 24.75″ 21.00″ .250″ 21.00″ 18.00″ 6.75″ 2.62″ 6.50″ 1.50″ 24
20″ 19.00″ 30.50″ 27.00″ 23.00″ .250″ 23.12″ 20.00″ 6.87″ 2.75″ 6.62″ 1.62″ 24
22″ 21.00″ 33.00″ 29.25″ 25.25″ .250″ 25.25″ 22.00″ 7.00″ 2.88″ 6.75″ 1.75″ 24
24″ 23.00″ 36.00″ 32.00″ 27.25″ .250″ 27.62″ 24.00″ 7.13″ 3.00″ 6.88″ 1.88″ 24

 

WN CLASS 600 (IN INCH)

Weld neck flange dimensions class 600 (ASME B16.5) in inches

Welding Neck Flange Dimensions

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
1/2″ 0.55″ 3.75″ 2.62″ 1.38″ .250″ 1.50″ 0.84″ 2.31″ 0.56″ 2.06″ 0.62″ 4
3/4″ 0.74″ 4.62″ 3.25″ 1.69″ .250″ 1.88″ 1.05″ 2.50″ 0.62″ 2.25″ 0.75″ 4
1″ 0.96″ 4.88″ 3.50″ 2.00″ .250″ 2.12″ 1.32″ 2.69″ 0.69″ 2.44″ 0.75″ 4
1-1/4″ 1.28″ 5.25″ 3.88″ 2.50″ .250″ 2.50″ 1.66″ 2.87″ 0.81″ 2.62″ 0.75″ 4
1-1/2″ 1.50″ 6.12″ 4.50″ 2.88″ .250″ 2.75″ 1.90″ 3.00″ 0.88″ 2.75″ 0.88″ 4
2″ 1.94″ 6.50″ 5.00″ 3.62″ .250″ 3.31″ 2.38″ 3.13″ 1.00″ 2.88″ 0.75″ 8
2-1/2″ 2.32″ 7.50″ 5.88″ 4.12″ .250″ 3.94″ 2.88″ 3.37″ 1.12″ 3.12″ 0.88″ 8
3″ 2.90″ 8.25″ 6.62″ 5.00″ .250″ 4.62″ 3.50″ 3.50″ 1.25″ 3.25″ 0.88″ 8
3-1/2″ 3.36″ 9.00″ 7.25″ 5.50″ .250″ 5.25″ 4.00″ 3.63″ 1.38″ 3.38″ 1.00″ 8
4″ 3.83″ 10.75″ 8.50″ 6.19″ .250″ 6.00″ 4.50″ 4.25″ 1.5″ 4.00″ 1.00″ 8
5″ 4.81″ 13.00″ 10.50″ 7.31″ .250″ 7.44″ 5.56″ 4.75″ 1.75″ 4.50″ 1.12″ 8
6″ 5.76″ 14.00″ 11.50″ 8.50″ .250″ 8.75″ 6.63″ 4.87″ 1.88″ 4.62″ 1.12″ 12
8″ 7.63″ 16.50″ 13.75″ 10.62″ .250″ 10.75″ 8.63″ 5.50″ 2.19″ 5.25″ 1.25″ 12
10″ 9.75″ 20.00″ 17.00″ 12.75″ .250″ 13.5″ 10.75″ 6.25″ 2.50″ 6.00″ 1.38″ 16
12″ 11.75″ 22.00″ 19.25″ 15.00″ .250″ 15.75″ 12.75″ 6.37″ 2.62″ 6.12″ 1.38″ 20
14″ 13.00″ 23.75″ 20.75″ 16.25″ .250″ 17.00″ 14.00″ 6.75″ 2.75″ 6.50″ 1.50″ 20
16″ 15.00″ 27.00″ 23.75″ 18.50″ .250″ 19.50″ 16.00″ 7.25″ 3.00″ 7.00″ 1.62″ 20
18″ 17.00″ 29.25″ 25.75″ 21.00″ .250″ 21.50″ 18.00″ 7.50″ 3.25″ 7.25″ 1.75″ 20
20″ 19.00″ 32.00″ 28.50″ 23.00″ .250″ 24.00″ 20.00″ 7.75″ 3.50″ 7.50″ 1.75″ 24
22″ 21.00″ 34.25″ 30.63″ 25.25″ .250″ 26.25″ 22.00″ 8.00″ 3.75″ 7.75″ 1.75″ 24
24″ 23.00″ 37.00″ 33.00″ 27.25″ .250″ 28.25″ 24.00″ 8.25″ 4.00″ 8.00″ 2.00″ 24

WN CLASS 900 (IN INCH)

Weld neck flange dimensions class 900 (ASME B16.5) in inches

Welding Neck Flange Dimensions

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
3″ 2.90″ 9.50″ 7.50″ 5.00″ .250″ 5.00″ 3.50″ 4.25″ 1.50″ 4.00″ 1.00″ 8
4″ 3.83″ 11.50″ 9.25″ 6.19″ .250″ 6.25″ 4.50″ 4.75″ 1.75″ 4.50″ 1.25″ 8
5″ 4.81″ 13.75″ 11.00″ 7.31″ .250″ 7.50″ 5.56″ 5.25″ 3.00″ 5.00″ 1.38″ 8
6″ 5.76″ 15.00″ 12.50″ 8.50″ .250″ 9.25″ 6.63″ 5.75″ 2.19″ 5.50″ 1.25″ 12
8″ 7.63″ 18.50″ 15.50″ 10.63″ .250″ 11.75″ 8.63″ 6.63″ 2.50″ 6.38″ 1.50″ 12
10″ 9.75″ 21.50″ 18.50″ 12.75″ .250″ 14.50″ 10.75″ 7.50″ 2.75″ 7.25″ 1.50″ 16
12″ 11.75″ 24.00″ 21.00″ 15.00″ .250″ 16.50″ 12.75″ 8.13″ 3.13″ 7.88″ 1.50″ 20
14″ 13.00″ 25.25″ 22.00″ 16.25″ .250″ 17.75″ 14.00″ 8.63″ 3.38″ 8.38″ 1.63″ 20
16″ 15.00″ 27.75″ 24.25″ 18.50″ .250″ 20.00″ 16.00″ 8.75″ 3.50″ 8.50″ 1.75″ 20
18″ 17.00″ 31.00″ 27.00″ 21.00″ .250″ 22.25″ 18.00″ 9.25″ 4.00″ 9.00″ 2.00″ 20
20″ 19.00″ 33.75″ 29.50″ 23.00″ .250″ 24.50″ 20.00″ 10.00″ 4.25″ 9.75″ 2.13″ 20
24″ 23.00″ 41.00″ 35.50″ 27.25″ .250″ 29.50″ 24.00″ 11.75″ 5.50″ 11.50″ 2.63″ 20

WN CLASS 1500 (IN INCH)

Weld neck flange dimensions class 1500 (ASME B16.5) in inches

Welding Neck Flange Dimensions

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
1/2″ 0.55″ 4.75″ 3.25″ 1.38″ .250″ 1.50″ 0.84″ 2.63″ 0.88″ 2.38″ 0.88″ 4
3/4″ 0.74″ 5.13″ 3.50″ 1.69″ .250″ 1.75″ 1.05″ 3.00″ 1.00″ 2.75″ 0.88″ 4
1″ 0.96″ 5.88″ 4.00″ 2.00″ .250″ 2.06″ 1.32″ 3.13″ 1.13″ 2.88″ 1.00″ 4
1-1/4″ 1.28″ 6.25″ 4.38″ 2.50″ .250″ 2.50″ 1.66″ 3.13″ 1.13″ 2.88″ 1.00″ 4
1-1/2″ 1.50″ 7.00″ 4.88″ 2.88″ .250″ 2.75″ 1.90″ 3.50″ 1.25″ 3.25″ 1.13″ 4
2″ 1.94″ 8.50″ 6.50″ 3.63″ .250″ 4.13″ 2.38″ 4.25″ 1.50″ 4.00″ 1.00″ 8
2-1/2″ 2.32″ 9.63″ 7.50″ 4.13″ .250″ 4.88″ 2.88″ 4.38″ 1.63″ 4.13″ 1.13″ 8
3″ 2.90″ 10.50″ 8.00″ 5.00″ .250″ 5.25″ 3.50″ 4.88″ 1.88″ 4.63″ 1.25″ 8
4″ 3.83″ 12.25″ 9.50″ 6.19″ .250″ 6.38″ 4.50″ 5.13″ 2.13″ 4.88″ 1.38″ 8
5″ 4.81″ 14.75″ 11.50″ 7.31″ .250″ 7.75″ 5.56″ 6.38″ 2.88″ 6.13″ 1.63″ 8
6″ 5.76″ 15.50″ 12.50″ 8.50″ .250″ 9.00″ 6.63″ 7.00″ 3.25″ 6.75″ 1.50″ 12
8″ 7.63″ 19.00″ 15.50″ 10.63″ .250″ 11.50″ 8.63″ 8.63″ 3.63″ 8.38″ 1.75″ 12
10″ 9.75″ 23.00″ 19.00″ 12.75″ .250″ 14.50″ 10.75″ 10.25″ 4.25″ 10.00″ 2.00″ 12
12″ 11.75″ 26.50″ 22.50″ 15.00″ .250″ 17.75″ 12.75″ 11.38″ 4.88″ 11.13″ 2.13″ 16
14″ 13.00″ 29.50″ 25.00″ 16.25″ .250″ 19.50″ 14.00″ 12.00″ 5.25″ 11.75″ 2.38″ 16
16″ 15.00″ 32.50″ 27.75″ 18.50″ .250″ 21.75″ 16.00″ 12.50″ 5.75″ 12.25″ 2.63″ 16
18″ 17.00″ 36.00″ 30.50″ 21.00″ .250″ 23.50″ 18.00″ 13.13″ 6.38″ 12.88″ 2.88″ 16
20″ 19.00″ 38.75″ 32.75″ 23.00″ .250″ 25.25″ 20.00″ 14.25″ 7.00″ 14.00″ 3.13″ 16
24″ 23.00″ 46.00″ 39.00″ 27.25″ .250″ 30.00″ 24.00″ 16.25″ 8.00″ 16.00″ 3.63″ 16

WN CLASS 2500 (IN INCH)

Weld neck flange dimensions class 2500 (ASME B16.5) in inches

Welding Neck Flange Dimensions

Flange NPS Inside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
H H1 Raised Face
Thickness (T)
T1 Flat Face
Thickness (T2)
Bolt Hole
(B)
No. of
Bolt Holes
1/2″ 0.55″ 5.25″ 3.50″ 1.38″ .250″ 1.69″ 0.84″ 3.13″ 1.19″ 2.88″ 0.88″ 4
3/4″ 0.74″ 5.50″ 3.75″ 1.69″ .250″ 2.00″ 1.05″ 3.38″ 1.25″ 3.13″ 0.88″ 4
1″ 0.96″ 6.25″ 4.25″ 2.00″ .250″ 2.25″ 1.32″ 3.75″ 1.38″ 3.50″ 1.00″ 4
1-1/4″ 1.28″ 7.25″ 5.13″ 2.50″ .250″ 2.88″ 1.66″ 4.00″ 1.50″ 3.75″ 1.13″ 4
1-1/2″ 1.50″ 8.00″ 5.75″ 2.88″ .250″ 3.13″ 1.90″ 4.63″ 1.75″ 4.38″ 1.25″ 4
2″ 1.94″ 9.25″ 6.75″ 3.63″ .250″ 3.75″ 2.38″ 5.25″ 2.00″ 5.00″ 1.13″ 8
2-1/2″ 2.32″ 10.50″ 7.75″ 4.13″ .250″ 4.50″ 2.88″ 5.88″ 2.25″ 5.63″ 1.25″ 8
3″ 2.90″ 12.00″ 9.00″ 5.00″ .250″ 5.25″ 3.50″ 6.88″ 2.63″ 6.63″ 1.38″ 8
4″ 3.83″ 14.00″ 10.75″ 6.19″ .250″ 6.50″ 4.50″ 7.75″ 3.00″ 7.50″ 1.63″ 8
5″ 4.81″ 16.50″ 12.75″ 7.31″ .250″ 8.00″ 5.56″ 9.25″ 3.63″ 9.00″ 1.88″ 8
6″ 5.76″ 19.00″ 14.50″ 8.50″ .250″ 9.25″ 6.63″ 11.00″ 4.25″ 10.75″ 2.13″ 8
8″ 7.63″ 21.75″ 17.25″ 10.63″ .250″ 12.00″ 8.63″ 12.75″ 5.00″ 12.50″ 2.13″ 12
10″ 9.75″ 26.50″ 21.25″ 12.75″ .250″ 14.75″ 10.75″ 16.75″ 6.50″ 16.50″ 2.63″ 12
12″ 11.75″ 30.00″ 24.38″ 15.00″ .250″ 17.38″ 12.75″ 18.50″ 7.25″ 18.25″ 2.88″ 12

 

WELDING NECK FLANGE DIMENSIONS IN MILLIMETERS

WN CLASS 150 (IN MM)

Weld neck flange dimensions class 150 (ASME B16.5) in millimeters

WN flange dimensions in mm

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
T1
mm
A
mm
1/2 89 30.2 35.1 11.2 15.7 47.8 21.3
3/4 99 38.1 42.9 12.7 20.8 52.3 26.7
1 108 49.3 50.8 14.2 26.7 55.6 33.5
117 58.7 63.5 15.7 35.1 57.2 42.2
127 65.0 73.2 17.5 40.9 62.0 48.3
2 152 77.7 91.9 19.1 52.6 63.5 60.5
178 90.4 104.6 22.4 62.7 69.9 73.2
3 191 108.0 127.0 23.9 78.0 69.9 88.9
216 122.2 139.7 23.9 90.2 71.4 101.6
4 229 134.9 157.2 23.9 102.4 76.2 114.3
5 254 163.6 185.7 23.9 128.3 88.9 141.2
6 279 192.0 215.9 25.4 154.2 88.9 168.4
8 343 246.1 269.7 28.4 202.7 101.6 218.2
10 406 304.8 323.9 30.2 254.5 101.6 273.1
12 483 365.3 381.0 31.8 304.8 114.3 323.9
14 533 400.1 412.8 35.1 336.6 127.0 355.6
16 597 457.2 469.9 36.6 387.4 127.0 406.4
18 635 505.0 533.4 39.6 438.2 139.7 457.2
20 699 558.8 584.2 42.9 489.0 144.5 508.0
24 813 663.4 692.2 47.8 590.6 152.4 609.6

 

Size Bolt Drilling Bolting Requirements
inch Bolt circle
Diameter mm
Holes # Holes Dia. mm Bolt Dia. inch. Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/2 60.5 4 15.7 1/2 50.8 57.2
3/4 69.9 4 15.7 1/2 50.8 63.5
1 79.2 4 15.7 1/2 57.2 63.5 76.2
88.9 4 15.7 1/2 57.2 69.9 82.6
98.6 4 15.7 1/2 63.5 69.9 82.6
2 120.7 4 19.1 5/8 69.9 82.6 95.3
139.7 4 19.1 5/8 76.2 88.9 101.6
3 152.4 4 19.1 5/8 76.2 88.9 101.6
177.8 8 19.1 5/8 76.2 88.9 101.6
4 190.5 8 19.1 5/8 76.2 88.9 101.6
5 215.9 8 22.4 3/4 82.6 95.3 108.0
6 241.3 8 22.4 3/4 82.6 101.6 114.3
8 298.5 8 22.4 3/4 88.9 108.0 120.7
10 362.0 12 25.4 7/8 101.6 114.3 127.0
12 431.8 12 25.4 7/8 101.6 120.7 133.4
14 476.3 12 28.4 1 114.3 133.4 146.1
16 539.8 16 28.4 1 114.3 133.4 146.1
18 577.9 16 31.8 11/8 127.0 146.1 158.8
20 635.0 20 31.8 11/8 139.7 158.8 171.5
24 749.3 20 35.1 152.4 171.5 184.2

WN CLASS 300 (IN MM)

Weld neck flange dimensions class 300 (ASME B16.5) in millimeters

WN flange dimensions in mm

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
T1
mm
A
mm
1/2 95 38.1 35.1 14.2 15.7 52.3 21.3
3/4 117 47.8 42.9 15.7 20.8 57.2 26.7
1 124 53.8 50.8 17.5 26.7 62.0 33.5
133 63.5 63.5 19.1 35.1 65.0 42.2
155 69.9 73.2 20.6 40.9 68.3 48.3
2 165 84.1 91.9 22.4 52.6 69.9 60.5
191 100.1 104.6 25.4 62.7 76.2 73.2
3 210 117.3 127.0 28.4 78.0 79.2 88.9
229 133.4 139.7 30.2 90.2 81.0 101.6
4 254 146.1 157.2 31.8 102.4 85.9 114.3
5 279 177.8 185.7 35.1 128.3 98.6 141.2
6 318 206.2 215.9 36.6 154.2 98.6 168.4
8 381 260.4 269.7 41.1 202.7 111.3 219.2
10 445 320.5 323.9 47.8 254.5 117.3 273.1
12 521 374.7 381.0 50.8 304.8 130.0 323.9
14 584 425.5 412.8 63.8 336.6 142.7 355.6
16 648 482.6 469.9 57.2 387.4 146.1 406.4
18 711 533.4 533.4 60.5 438.2 158.8 457.2
20 775 587.2 584.2 63.5 489.0 162.1 508.0
24 914 701.5 692.2 69.9 590.6 168.1 609.6

 

Size Bolt Drilling Bolting Requirements
inch Bolt circle
Diameter mm
Holes # Holes Dia. mm Bolt Dia. inch. Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/2 66.5 4 15.7 1/2 57.2 63.5 76.2
3/4 82.6 4 19.1 5/8 63.5 76.2 88.9
1 88.9 4 19.1 5/8 63.5 76.2 88.9
98.6 4 19.1 5/8 69.9 82.6 95.3
114.3 4 22.4 3/4 76.2 88.9 101.6
2 127.0 8 19.1 5/8 76.2 88.9 101.6
149.4 8 22.4 3/4 82.6 101.6 114.3
3 168.1 8 22.4 3/4 88.9 108.0 120.7
184.2 8 22.4 3/4 95.3 108.0 127.0
4 200.2 8 22.4 3/4 95.3 114.3 127.0
5 235.0 8 22.4 3/4 108.0 120.7 133.4
6 269.7 12 22.4 3/4 108.0 120.7 139.7
8 330.2 12 25.4 7/8 120.7 139.7 152.4
10 387.4 16 28.4 1 139.7 158.8 171.5
12 450.9 16 31.8 11/8 146.1 171.5 184.2
14 514.4 20 31.8 11/8 158.8 177.8 190.5
16 571.5 20 35.1 165.1 190.5 203.2
18 628.7 24 35.1 171.5 196.9 209.6
20 685.8 24 35.1 184.2 203.2 222.3
24 812.8 24 41.1 203.2 228.6 254.0

WN CLASS 600 (IN MM)

Weld neck flange dimensions class 300 (ASME B16.5) in millimeters

WN flange dimensions in mm

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
T1
mm
A
mm
1/2 95 38.1 35.1 14.2 B36.10/.19 52.3 21.3
3/4 117 47.8 42.9 15.7 B36.10/.19 57.2 26.7
1 124 53.8 50.8 17.5 B36.10/.19 62.0 33.5
133 63.5 63.5 20.6 B36.10/.19 66.5 42.2
155 69.9 73.2 22.4 B36.10/.19 69.9 48.3
2 165 84.1 91.9 25.4 B36.10/.19 73.2 60.5
191 100.1 104.6 28.4 B36.10/.19 79.2 73.2
3 210 117.3 127.0 31.8 B36.10/.19 82.6 88.9
229 133.4 139.7 35.1 B36.10/.19 85.9 101.6
4 273 152.4 157.2 38.1 B36.10/.19 101.6 114.3
5 330 189.0 185.7 44.5 B36.10/.19 114.3 141.2
6 356 222.3 215.9 47.8 B36.10/.19 117.3 168.4
8 419 273.1 269.7 55.6 B36.10/.19 133.4 219.2
10 508 342.9 323.9 63.5 B36.10/.19 152.4 273.1
12 559 400.1 381.0 66.5 B36.10/.19 155.4 323.9
14 603 431.8 412.8 69.9 B36.10/.19 165.1 355.6
16 686 495.3 469.9 76.2 B36.10/.19 177.8 406.4
18 743 546.1 533.4 82.6 B36.10/.19 184.2 457.2
20 813 609.6 584.2 88.9 B36.10/.19 190.5 508.0
24 940 717.6 692.2 101.6 B36.10/.19 203.2 609.6

 

Size Bolt Drilling Bolting Requirements
inch Bolt circle
Diameter mm
Holes # Holes Dia. mm Bolt Dia. inch. Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/2 66.5 4 15.7 1/2 76.2 69.9 76.2
3/4 82.6 4 19.1 5/8 88.9 82.6 88.9
1 88.9 4 19.1 5/8 88.9 82.6 88.9
98.6 4 19.1 5/8 95.3 88.9 95.3
114.3 4 22.4 3/4 108.0 101.6 108.0
2 127.0 8 19.1 5/8 108.0 101.6 108.0
149.4 8 22.4 3/4 120.7 114.3 120.7
3 168.1 8 22.4 3/4 127.0 120.7 127.0
184.2 8 25.4 7/8 139.7 133.4 139.7
4 215.9 8 25.4 7/8 146.1 139.7 146.1
5 266.7 8 28.4 1 165.1 158.8 165.1
6 292.1 12 28.4 1 171.5 165.1 171.5
8 349.3 12 31.8 11/8 190.5 184.2 196.9
10 431.8 16 35.1 215.9 209.6 215.9
12 489.0 20 35.1 222.3 215.9 222.3
14 527.1 20 38.1 13/8 235.0 228.6 235.0
16 603.3 20 41.1 254.0 247.7 254.0
18 654.1 20 44.5 15/8 273.1 266.7 273.1
20 723.9 24 44.5 15/8 285.8 279.4 292.1
24 838.2 24 50.8 17/8 330.2 323.9 336.6

WN CLASS 900 (IN MM)

Weld neck flange dimensions class 300 (ASME B16.5) in millimeters

WN flange dimensions in mm

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
T1
mm
A
mm
1/2 121 38.1 35.1 22.4 B36.10/.19 60.5 21.3
3/4 130 44.5 42.9 25.4 B36.10/.19 69.9 26.7
1 149 52.3 50.8 28.4 B36.10/.19 73.2 33.5
159 63.5 63.5 28.4 B36.10/.19 73.2 42.2
178 69.9 73.2 31.8 B36.10/.19 82.6 48.3
2 216 104.6 91.9 38.1 B36.10/.19 101.6 60.5
244 124.0 104.6 41.1 B36.10/.19 104.6 73.2
3 241 127.0 127.0 38.1 B36.10/.19 101.6 88.9
4 292 158.8 157.2 44.5 B36.10/.19 114.3 114.3
5 349 190.5 185.7 50.8 B36.10/.19 127.0 141.2
6 381 235.0 215.9 55.6 B36.10/.19 139.7 168.4
8 470 298.5 269.7 63.5 B36.10/.19 162.1 219.2
10 546 368.3 323.9 69.9 B36.10/.19 184.2 273.1
12 610 419.1 381.0 79.2 B36.10/.19 200.2 323.9
14 641 450.9 412.8 85.9 B36.10/.19 212.9 355.6
16 705 508.0 469.9 88.9 B36.10/.19 215.9 406.4
18 787 565.2 533.4 101.6 B36.10/.19 228.6 457.2
20 857 622.3 584.2 108.0 B36.10/.19 247.7 508.0
24 1041 749.3 692.2 139.7 B36.10/.19 292.1 609.6

 

Size Bolt Drilling Bolting Requirements
inch Bolt circle
Diameter mm
Holes # Holes Dia. mm Bolt Dia. inch. Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/2 82.6 4 22.4 3/4 108.0 101.6 108.0
3/4 88.9 4 22.4 3/4 114.3 108.0 114.3
1 101.6 4 25.4 7/8 127.0 120.7 127.0
111.3 4 25.4 7/8 127.0 120.7 127.0
124.0 4 28.4 1 139.7 133.4 139.7
2 165.1 8 25.4 7/8 146.1 139.7 146.1
190.5 8 28.4 1 158.8 152.4 158.8
3 190.5 8 25.4 7/8 146.1 139.7 146.1
4 235.0 8 31.8 11/8 171.5 165.1 171.5
5 279.4 8 35.1 190.5 184.2 190.5
6 317.5 12 31.8 11/8 190.5 184.2 196.9
8 393.7 12 38.1 13/8 222.3 215.9 222.3
10 469.9 16 38.1 13/8 235.0 228.6 235.0
12 533.4 20 38.1 13/8 254.0 247.7 254.0
14 558.8 20 41.1 273.1 266.7 292.1
16 616.0 20 44.5 15/8 285.8 279.4 298.5
18 685.8 20 50.8 17/8 323.9 317.5 333.6
20 749.3 20 53.8 2 349.3 342.9 362.0
24 901.7 20 66.5 438.2 431.8 457.2

 

DIMENSIONAL TOLERANCE WELDING NECK FLANGE

Certificate Plate thickness in mm Width in mm Length in mm
Outside Diameter When O is 24″ or less. When O is over 24″. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm
Diameter of Contact Face 0.06″ (1.6 mm) raised face. 0.25″ (6.4 mm) raised face. ±0.03″ ±0.02″ ±0.8 mm ±0.5mm
Diameter of Hub at Point of Welding NPS 5 and smaller. NPS 6 and larger. +0.09″, -0.03″ +0.16″, -0.03″ +2.4 mm, -0.8mm +4.0 mm, -0.8 mm
Inside Diameter NPS 10, 12, 18, 20 and larger. +0.03″ +0.06″ +0.12″, -0.06″ +0.8 mm +1.6 mm +3.2 mm, -1.6 mm
Diameter of Hub at Base Hub Base is 24″or less. Hub Base is over 24″. +0.06″ +0.12″ +1.6 mm +3.2 mm
Thickness NPS 18 and smaller. NPS 20 and larger. +0.12″ +0.19″ +3.2 mm +4.8 mm
Drilling and Facings Bolt circle diameter Bolt Hole Spacing ±0.06″ ±0.03″ ±1.6 mm ±0.8 mm
Eccentricity of Bolt Circle and Facing NPS 2 1/2 and smaller. NPS 3 and larger. ±0.03″ ±0.06″ ±0.8 mm ±1.6 mm
Length Through Hub NPS 10 and smaller. NPS 12 and larger. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm

One Response

  1. There are mistake on the drawings and tables for metric units for threaded and WN flanges rated class 600 & 900 (other types were not checked).
    Note that the RF (raised face dimension is not always 1.6 mm. For these flanges the height of raised face is 6.4 mm (0.25″). Also that height is not included in the overall length (or height) of the flange.

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