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

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Table of Contents

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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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 NPSInside
Diameter
Outside
Diameter
Bolt Circle
(BC)
Raised Face
(R)
Raised Face
(RF)
HH1Raised Face
Thickness (T)
T1Flat 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
1/28930.235.111.215.747.821.3
3/49938.142.912.720.852.326.7
110849.350.814.226.755.633.5
11758.763.515.735.157.242.2
12765.073.217.540.962.048.3
215277.791.919.152.663.560.5
17890.4104.622.462.769.973.2
3191108.0127.023.978.069.988.9
216122.2139.723.990.271.4101.6
4229134.9157.223.9102.476.2114.3
5254163.6185.723.9128.388.9141.2
6279192.0215.925.4154.288.9168.4
8343246.1269.728.4202.7101.6218.2
10406304.8323.930.2254.5101.6273.1
12483365.3381.031.8304.8114.3323.9
14533400.1412.835.1336.6127.0355.6
16597457.2469.936.6387.4127.0406.4
18635505.0533.439.6438.2139.7457.2
20699558.8584.242.9489.0144.5508.0
24813663.4692.247.8590.6152.4609.6

 

SizeBolt DrillingBolting Requirements
inchBolt circle
Diameter mm
Holes #Holes Dia. mmBolt Dia. inch.Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/260.5415.71/250.857.2
3/469.9415.71/250.863.5
179.2415.71/257.263.576.2
88.9415.71/257.269.982.6
98.6415.71/263.569.982.6
2120.7419.15/869.982.695.3
139.7419.15/876.288.9101.6
3152.4419.15/876.288.9101.6
177.8819.15/876.288.9101.6
4190.5819.15/876.288.9101.6
5215.9822.43/482.695.3108.0
6241.3822.43/482.6101.6114.3
8298.5822.43/488.9108.0120.7
10362.01225.47/8101.6114.3127.0
12431.81225.47/8101.6120.7133.4
14476.31228.41114.3133.4146.1
16539.81628.41114.3133.4146.1
18577.91631.811/8127.0146.1158.8
20635.02031.811/8139.7158.8171.5
24749.32035.1152.4171.5184.2

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
1/29538.135.114.215.752.321.3
3/411747.842.915.720.857.226.7
112453.850.817.526.762.033.5
13363.563.519.135.165.042.2
15569.973.220.640.968.348.3
216584.191.922.452.669.960.5
191100.1104.625.462.776.273.2
3210117.3127.028.478.079.288.9
229133.4139.730.290.281.0101.6
4254146.1157.231.8102.485.9114.3
5279177.8185.735.1128.398.6141.2
6318206.2215.936.6154.298.6168.4
8381260.4269.741.1202.7111.3219.2
10445320.5323.947.8254.5117.3273.1
12521374.7381.050.8304.8130.0323.9
14584425.5412.863.8336.6142.7355.6
16648482.6469.957.2387.4146.1406.4
18711533.4533.460.5438.2158.8457.2
20775587.2584.263.5489.0162.1508.0
24914701.5692.269.9590.6168.1609.6

 

SizeBolt DrillingBolting Requirements
inchBolt circle
Diameter mm
Holes #Holes Dia. mmBolt Dia. inch.Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/266.5415.71/257.263.576.2
3/482.6419.15/863.576.288.9
188.9419.15/863.576.288.9
98.6419.15/869.982.695.3
114.3422.43/476.288.9101.6
2127.0819.15/876.288.9101.6
149.4822.43/482.6101.6114.3
3168.1822.43/488.9108.0120.7
184.2822.43/495.3108.0127.0
4200.2822.43/495.3114.3127.0
5235.0822.43/4108.0120.7133.4
6269.71222.43/4108.0120.7139.7
8330.21225.47/8120.7139.7152.4
10387.41628.41139.7158.8171.5
12450.91631.811/8146.1171.5184.2
14514.42031.811/8158.8177.8190.5
16571.52035.1165.1190.5203.2
18628.72435.1171.5196.9209.6
20685.82435.1184.2203.2222.3
24812.82441.1203.2228.6254.0

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
1/29538.135.114.2B36.10/.1952.321.3
3/411747.842.915.7B36.10/.1957.226.7
112453.850.817.5B36.10/.1962.033.5
13363.563.520.6B36.10/.1966.542.2
15569.973.222.4B36.10/.1969.948.3
216584.191.925.4B36.10/.1973.260.5
191100.1104.628.4B36.10/.1979.273.2
3210117.3127.031.8B36.10/.1982.688.9
229133.4139.735.1B36.10/.1985.9101.6
4273152.4157.238.1B36.10/.19101.6114.3
5330189.0185.744.5B36.10/.19114.3141.2
6356222.3215.947.8B36.10/.19117.3168.4
8419273.1269.755.6B36.10/.19133.4219.2
10508342.9323.963.5B36.10/.19152.4273.1
12559400.1381.066.5B36.10/.19155.4323.9
14603431.8412.869.9B36.10/.19165.1355.6
16686495.3469.976.2B36.10/.19177.8406.4
18743546.1533.482.6B36.10/.19184.2457.2
20813609.6584.288.9B36.10/.19190.5508.0
24940717.6692.2101.6B36.10/.19203.2609.6

 

SizeBolt DrillingBolting Requirements
inchBolt circle
Diameter mm
Holes #Holes Dia. mmBolt Dia. inch.Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/266.5415.71/276.269.976.2
3/482.6419.15/888.982.688.9
188.9419.15/888.982.688.9
98.6419.15/895.388.995.3
114.3422.43/4108.0101.6108.0
2127.0819.15/8108.0101.6108.0
149.4822.43/4120.7114.3120.7
3168.1822.43/4127.0120.7127.0
184.2825.47/8139.7133.4139.7
4215.9825.47/8146.1139.7146.1
5266.7828.41165.1158.8165.1
6292.11228.41171.5165.1171.5
8349.31231.811/8190.5184.2196.9
10431.81635.1215.9209.6215.9
12489.02035.1222.3215.9222.3
14527.12038.113/8235.0228.6235.0
16603.32041.1254.0247.7254.0
18654.12044.515/8273.1266.7273.1
20723.92444.515/8285.8279.4292.1
24838.22450.817/8330.2323.9336.6

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
1/212138.135.122.4B36.10/.1960.521.3
3/413044.542.925.4B36.10/.1969.926.7
114952.350.828.4B36.10/.1973.233.5
15963.563.528.4B36.10/.1973.242.2
17869.973.231.8B36.10/.1982.648.3
2216104.691.938.1B36.10/.19101.660.5
244124.0104.641.1B36.10/.19104.673.2
3241127.0127.038.1B36.10/.19101.688.9
4292158.8157.244.5B36.10/.19114.3114.3
5349190.5185.750.8B36.10/.19127.0141.2
6381235.0215.955.6B36.10/.19139.7168.4
8470298.5269.763.5B36.10/.19162.1219.2
10546368.3323.969.9B36.10/.19184.2273.1
12610419.1381.079.2B36.10/.19200.2323.9
14641450.9412.885.9B36.10/.19212.9355.6
16705508.0469.988.9B36.10/.19215.9406.4
18787565.2533.4101.6B36.10/.19228.6457.2
20857622.3584.2108.0B36.10/.19247.7508.0
241041749.3692.2139.7B36.10/.19292.1609.6

 

SizeBolt DrillingBolting Requirements
inchBolt circle
Diameter mm
Holes #Holes Dia. mmBolt Dia. inch.Length
FF Flange
Length
RF Flange
Length
RTJ Flange
1/282.6422.43/4108.0101.6108.0
3/488.9422.43/4114.3108.0114.3
1101.6425.47/8127.0120.7127.0
111.3425.47/8127.0120.7127.0
124.0428.41139.7133.4139.7
2165.1825.47/8146.1139.7146.1
190.5828.41158.8152.4158.8
3190.5825.47/8146.1139.7146.1
4235.0831.811/8171.5165.1171.5
5279.4835.1190.5184.2190.5
6317.51231.811/8190.5184.2196.9
8393.71238.113/8222.3215.9222.3
10469.91638.113/8235.0228.6235.0
12533.42038.113/8254.0247.7254.0
14558.82041.1273.1266.7292.1
16616.02044.515/8285.8279.4298.5
18685.82050.817/8323.9317.5333.6
20749.32053.82349.3342.9362.0
24901.72066.5438.2431.8457.2

 

DIMENSIONAL TOLERANCE WELDING NECK FLANGE

CertificatePlate thickness in mmWidth in mmLength in mm
Outside DiameterWhen O is 24″ or less. When O is over 24″.±0.06″ ±0.12″±1.6 mm±3.2 mm
Diameter of Contact Face0.06″ (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 WeldingNPS 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 DiameterNPS 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 BaseHub Base is 24″or less. Hub Base is over 24″.+0.06″ +0.12″+1.6 mm+3.2 mm
ThicknessNPS 18 and smaller. NPS 20 and larger.+0.12″ +0.19″+3.2 mm+4.8 mm
Drilling and FacingsBolt circle diameter Bolt Hole Spacing±0.06″ ±0.03″±1.6 mm±0.8 mm
Eccentricity of Bolt Circle and FacingNPS 2 1/2 and smaller. NPS 3 and larger.±0.03″ ±0.06″±0.8 mm±1.6 mm
Length Through HubNPS 10 and smaller. NPS 12 and larger.±0.06″ ±0.12″±1.6 mm±3.2 mm

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