Skip to content
Projectmaterials

Welding Neck Flanges Dimensions & Weights (ASME B16.5)

ASME Welding Neck Flange Dimensions and Weights

WN Flange Sizes in Inches

Welding Neck Flange Dimensions

WN Class 150

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

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

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

Welding Neck Flange Dimensions

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

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

Welding Neck Flange Dimensions

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

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

Welding Neck Flange Dimensions

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

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

Welding Neck Flange Dimensions

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

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

Welding Neck Flange Dimensions

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

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

Welding Neck Flange Dimensions

Flange NPSInsideDiameterOutsideDiameterBolt Circle(BC)Raised Face(R)Raised Face(RF)HH1Raised FaceThickness (T)T1Flat FaceThickness (T2)Bolt Hole(B)No. ofBolt 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

WN Flange Sizes in Millimeters

WN Class 150

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

WN flange dimensions in mm

SizeinchDmmXmmGmmtmmB1mmT1mmAmm
1/28930.235.111.215.747.821.3
3/49938.142.912.720.852.326.7
110849.350.814.226.755.633.5
1¼11758.763.515.735.157.242.2
1½12765.073.217.540.962.048.3
215277.791.919.152.663.560.5
2½17890.4104.622.462.769.973.2
3191108.0127.023.978.069.988.9
3½216122.2139.723.990.271.4101.6
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
Size (inch)Bolt Circle Dia. (mm)Holes #Holes Dia. (mm)Bolt Dia. (inch)Length FF FlangeLength RF FlangeLength RTJ Flange
1/260.5415.71/250.857.2–
3/469.9415.71/250.863.5–
179.2415.71/257.263.576.2
1¼88.9415.71/257.269.982.6
1½98.6415.71/263.569.982.6
2120.7419.15/869.982.695.3
2½139.7419.15/876.288.9101.6
3152.4419.15/876.288.9101.6
3½177.8819.15/876.288.9101.6
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
24749.32035.11¼152.4171.5184.2

WN Class 300

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

WN flange dimensions in mm

SizeinchDmmXmmGmmtmmB1mmT1mmAmm
1/29538.135.114.215.752.321.3
3/411747.842.915.720.857.226.7
112453.850.817.526.762.033.5
1¼13363.563.519.135.165.042.2
1½15569.973.220.640.968.348.3
216584.191.922.452.669.960.5
2½191100.1104.625.462.776.273.2
3210117.3127.028.478.079.288.9
3½229133.4139.730.290.281.0101.6
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
Size (inch)Bolt Circle Dia. (mm)Holes #Holes Dia. (mm)Bolt Dia. (inch)Length FF FlangeLength RF FlangeLength 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
1¼98.6419.15/869.982.695.3
1½114.3422.43/476.288.9101.6
2127.0819.15/876.288.9101.6
2½149.4822.43/482.6101.6114.3
3168.1822.43/488.9108.0120.7
3½184.2822.43/495.3108.0127.0
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
16571.52035.11¼165.1190.5203.2
18628.72435.11¼171.5196.9209.6
20685.82435.11¼184.2203.2222.3
24812.82441.11½203.2228.6254.0

WN Class 600

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

WN flange dimensions in mm

SizeinchDmmXmmGmmtmmB1mmT1mmAmm
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
1¼13363.563.520.6B36.10/.1966.542.2
1½15569.973.222.4B36.10/.1969.948.3
216584.191.925.4B36.10/.1973.260.5
2½191100.1104.628.4B36.10/.1979.273.2
3210117.3127.031.8B36.10/.1982.688.9
3½229133.4139.735.1B36.10/.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
Size (inch)Bolt Circle Dia. (mm)Holes #Holes Dia. (mm)Bolt Dia. (inch)Length FF FlangeLength RF FlangeLength 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
1¼98.6419.15/895.388.995.3
1½114.3422.43/4108.0101.6108.0
2127.0819.15/8108.0101.6108.0
2½149.4822.43/4120.7114.3120.7
3168.1822.43/4127.0120.7127.0
3½184.2825.47/8139.7133.4139.7
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
10431.81635.11¼215.9209.6215.9
12489.02035.11¼222.3215.9222.3
14527.12038.113/8235.0228.6235.0
16603.32041.11½254.0247.7254.0
18654.12044.515/8273.1266.7273.1
20723.92444.515/8285.8279.4292.1
24838.22450.817/8330.2323.9336.6

WN Class 900

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

WN flange dimensions in mm

SizeinchDmmXmmGmmtmmB1mmT1mmAmm
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
1¼15963.563.528.4B36.10/.1973.242.2
1½17869.973.231.8B36.10/.1982.648.3
2216104.691.938.1B36.10/.19101.660.5
2½244124.0104.641.1B36.10/.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
Size (inch)Bolt Circle Dia. (mm)Holes #Holes Dia. (mm)Bolt Dia. (inch)Length FF FlangeLength RF FlangeLength 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
1¼111.3425.47/8127.0120.7127.0
1½124.0428.41139.7133.4139.7
2165.1825.47/8146.1139.7146.1
2½190.5828.41158.8152.4158.8
3190.5825.47/8146.1139.7146.1
4235.0831.811/8171.5165.1171.5
5279.4835.11¼190.5184.2190.5
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
14558.82041.11½273.1266.7292.1
16616.02044.515/8285.8279.4298.5
18685.82050.817/8323.9317.5333.6
20749.32053.82349.3342.9362.0
24901.72066.51½438.2431.8457.2

Dimensional Tolerance Welding Neck Flange

DimensionConditionTolerance (inches)Tolerance (mm)Tolerance (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

WN Flange Weights

WN Flange Weight in Kgs.

The table shows the ASME B16.5 welding-neck flange weights in Kgs. by Flange NPS and Class (carbon/alloy steel materials; for higher grades, consider adjusting weight using the delta-specific weight carbon/other grades)

NPSClass 150Class 300Class 400Class 600Class 900Class 1500Class 2500
1/20.90.91.41.43.23.23.6
3/40.91.41.61.83.23.24.1
11.41.81.81.83.84.15.9
1¼1.42.322.74.54.59
1½1.83.23.63.66.36.312.6
22.74.14.55.410.811.318.9
2½4.55.46.38.113.916.223.4
35.28.18.110.416.221.642.3
3½5.4911.711.7–
47.411.915.818.923.932.965.7
59.516.219.430.638.759.4109.8
611.720.325.736.549.574.3170.1
818.931.140.15484.2123.8259.2
1024.34556.385.5120.6204.8480.6
1239.663.978.8101.7167.4310.5723.6
1451.392.7104.9156.2252.9423
1663112.5132.8216.5308.3562.5
1874.3144162249.8415.8731.3
2088.7180200.3310.5523.8922.5
22101.3209.3227.3324––
24120.6261288439.7948.21496

WN Flange Weight in Lbs.

The table shows the ASME B16.5 weld-neck flange weights in Lbs. by Flange NPS and Class (carbon/alloy steel materials; for higher grades, consider adjusting weight using the delta-specific weight carbon/other grades)

CLASS 150Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½2
¾2
13
1¼3
1½4
26
2½10
311.5
3½12
416.5
521
626
842
1054
1288
14114
16140
18165
20197
22225
24268
CLASS 300Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½2
¾3
14
1¼5
1½7
29
2½12
318
3½20
426.5
536
645
869
10100
12142
14206
16250
18320
20400
22465
24580
CLASS 400Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½3
¾3.5
14
1¼4.5
1½8
210
2½14
318
3½26
435
543
657
889
10125
12175
14233
16295
18360
20445
22505
24640
CLASS 600Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½3
¾4
14
1¼6
1½8
212
2½18
323
3½26
442
568
681
8120
10190
12226
14347
16481
18555
20690
22720
24977
CLASS 900Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½7
¾7
18.5
1¼10
1½14
224
2½31
336
453
586
6110
8187
10268
12372
14562
16685
18924
201164
242107
CLASS 1500Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½7
¾7
19
1¼10
1½14
225
2½36
348
473
5132
6165
8275
10455
12690
14940
161250
181625
202050
243325
CLASS 2500Nominal Pipe SizeWeld Neck Weight in Lbs./unit
½8
¾9
113
1¼20
1½28
242
2½52
394
4146
5244
6378
8576
101068
121608

Comments (Scroll to the end to post a comment)

Murat Niksic

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.

jayanti mehta

REQUEST FOR YOUR REQUIREMENT FOR STAINLESS STEEL, CARBON STEEL, ALLOY STEEL, COPPER ALLOYS & EXOTIC NICKEL ALLOYS IN FORM OF PIPE, TUBE, SHEET, PLATES, FITTINGS & FLANGES We STELCO INOX INC are Fastest growing International Suppliers & Exporters of Industrial Raw material to world renowned companies in India & abroad, providing them with world class quality material and service. Our products are supplied & accepted by our clients in various sphere of industries ranging from basic industries such as Paper, Textile, Sugar, Dairy, Cement, Engineering to more complex such as Petroleum, Chemicals, Power, Offshore, Onshore & Nuclear Industries. We have dedicated sources, expertise & full technical know-how to supply quality products as per Client's basic & special requirements. We deal in Stainless Steel, Carbon Steel, Alloy Steel, Copper Alloys & Exotic Nickel Alloys in form of Pipe, Tube, Sheet, Plates, Fittings & Flanges. We can fulfill Client's requirement of all size as we stock huge amount of material from both indigenous & foreign manufactures. Our major advantage is our qualified workforce, we have pool of specialist in field of Technical, Sales & Logistic, who are fully committed to provide with best solution for your business & can help you solve all your procurement problems. At STELCO INOX INC Quality is Guaranteed, we take use of innovative & latest available technology to meet client's full requirements regarding Quality & Value for money. We hope the information provide on our site to be useful to you & you will forward us your regular enquiry and requirements & provide us with an opportunity to work with your esteem Organisation. If you have any suggestion or query, how we can serve you better please do inform us. your suggestion are heartily welcomed. Thank you and assuring you our best co-operation always. Thank you and Warm Regards, Jayanti K. Metha+91 922 22 44 084 GST No : 27BBHPM2810H1ZTSTELCO INOX INCOffice No.29, Plot No.156,2nd Floor,1,Callian Building ,Khadilkar Road,Kandewadi,Girgaon,Mumbai-400004T : +91 92222 44084 / 2381 2828W : www.stelcoinox.comE : [email protected]

Mohammed Khalid

Hi Please I would like file pdf of neck flange dimensions table

Projectmaterials

Dear Mohammed Khalid, Thank you for your comment. We appreciate your interest in obtaining the PDF file of the neck flange dimensions table. Unfortunately, as mentioned in our previous conversation, we don't have the capability to directly share files or provide downloads on this platform. However, we highly recommend visiting our website or conducting a quick internet search for the specific neck flange dimensions table you are looking for. Many manufacturers and suppliers offer comprehensive tables in PDF format that can be easily downloaded from their websites. By utilizing these resources, you should be able to find the exact information you need regarding weld neck flange dimensions in various classes such as 150, 300, 900, 1500, and 2500. We hope this helps, and please feel free to reach out if you have any further questions or require additional assistance. Best regards,

Balsam Elalem

Hello, We are BRONSI PETROLEUM SERVICES, We would like to contact you about order? Thank you

Leave a Comment

Have a question or feedback? Send us a message.

Your comment will be reviewed and may be published on this page.