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Socket Weld Flanges Dimensions & Weights (ASME B16.5)

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The article shows the ASME B16.5 dimensions of Socket-Weld Flanges Classes from 150 to 1500 (NPS, ID, OD, Thickness, and bolting details, tolerances) – both in inches and millimeters.

ASME SOCKET WELD FLANGE DIMENSIONS & WEIGHTS

The article shows the dimensions and weights of ASME/ANSI B16.5 socket-weld flanges (SW)

SOCKET WELD FLANGE SIZES IN INCHES

SOCKET WELD CLASS 150

Dimensions of socket weld flange class 150 (in inches)

Socket Weld Flange Dimensions ASME B16.5

NPSIDODBolt Circle (BC)Raised Face (R)Raised Face (RF)HDID 2*Raised Face Thickness (T)T1Flat Face Thickness (T2)Bolt Hole (B)No. of Bolt Holes
1/2″0.88″3.50″2.38″1.38″.063″1.19″.38″0.62″.62″.38″.56″.62″4
3/4″1.09″3.88″2.75″1.69″.063″1.50″.44″0.82″.62″.44″.56″.62″4
1″1.36″4.25″3.12″2.00″.063″1.94″.50″1.05″.69″.50″.63″.62″4
1-1/4″1.70″4.62″3.50″2.50″.063″2.31″.56″1.38″.81″.56″.75″.62″4
1-1/2″1.97″5.00″3.88″2.88″.063″2.56″.62″1.61″.88″.62″.82″.62″4
2″2.44″6.00″4.75″3.62″.063″3.06″.69″2.07″1.00″.69″.94″.75″4
2-1/2″2.94″7.00″5.50″4.12″.063″3.56″.75″2.47″1.12″.82″1.06″.75″4
3″3.57″7.50″6.00″5.00″.063″4.25″.81″3.07″1.19″.88″1.13″.75″4
3-1/2″4.07″8.50″7.00″5.50″.063″4.81″.88″3.55″1.25″.88″1.19″.75″8
4″4.57″9.00″7.50″6.19″.063″5.31″.94″4.03″1.31″.88″1.25″.75″8
5″5.66″10.00″8.50″7.31″.063″6.44″.94″5.05″1.44″.88″1.38″.88″8
6″6.72″11.00″9.50″8.50″.063″7.56″1.06″6.07″1.56″.94″1.50″.88″8
8″8.72″13.50″11.75″10.62″.063″9.69″1.25″7.98″1.75″1.06″1.69″.88″8
10″10.88″16.00″14.25″12.75″.063″12.00″1.31″10.02″1.94″1.13″1.88″1.00″12
12″12.88″19.00″17.00″15.00″.063″14.38″1.56″12.00″2.19″1.19″2.13″1.00″12
14″14.14″21.00″18.75″16.25″.063″15.75″1.63″13.25″2.25″1.32″2.19″1.12″12
16″16.16″23.50″21.25″18.50″.063″18.00″1.75″15.25″2.50″1.38″2.44″1.12″16
18″18.18″25.00″22.75″21.00″.063″19.88″1.94″17.25″2.69″1.50″2.63″1.25″16
20″20.20″27.50″25.00″23.00″.063″22.00″2.13″19.25″2.88″1.63″2.83″1.25″20
22″22.22″29.50″27.25″25.25″.063″24.25″2.38″21.25″3.13″1.75″3.07″1.38″20
24″24.25″32.00″29.50″27.25″.063″26.12″2.50″23.25″3.25″1.82″3.19″1.38″20

SOCKET WELD CLASS 300

Dimensions of socket weld flange class 300 (in inches)

Socket Weld Flange Dimensions ASME B16.5

FLANGE
NPS
Inside
Diameter
Outside
Diameter
Bolt Circle (BC)Raised Face (R)Raised Face (RF)HDID 2*Raised Face Thickness (T)T1Flat Face Thickness (T2)Bolt Hole (B)No. of Bolt Holes
1/2″0.88″3.75″2.62″1.38″.063″1.50″.38″0.62″0.88″0.50″0.82″0.62″4
3/4″1.09″4.62″3.25″1.69″.063″1.88″.44″0.82″1.00″.056″0.94″0.75″4
1″1.36″4.88″3.50″2.00″.063″2.12″.50″1.05″1.06″0.63″1.00″0.75″4
1-1/4″1.70″5.25″3.88″2.50″.063″2.50″.56″1.38″1.06″0.69″1.00″0.75″4
1-1/2″1.97″6.12″4.50″2.88″.063″2.75″.62″1.61″1.19″0.75″1.13″0.88″4
2″2.44″6.50″5.00″3.62″.063″3.31″.69″2.07″1.31″0.82″1.25″0.75″8
2-1/2″2.94″7.50″5.88″4.12″.063″3.94″.75″2.47″1.50″0.94″1.44″0.88″8
3″3.57″8.25″6.62″5.00″.063″4.62″.81″3.07″1.69″1.06″1.63″0.88″8

SOCKET WELD CLASS 600

Dimensions of socket weld flanges class 600 (in inches)

Socket Weld Flange Dimensions ASME B16.5

FLANGE
NPS
IDODBolt Circle (BC)Raised Face (R)Raised Face (RF)HDID 2*Raised Face Thickness (T)T1Flat Face Thickness (T2)Bolt Hole (B)No. of Bolt Holes
1/2″0.88″3.75″2.62″1.38″.250″1.50″.38″0.55″1.13″0.56″0.88″0.62″4
3/4″1.09″4.62″3.25″1.69″.250″1.88″.44″0.74″1.25″0.62″1.00″0.75″4
1″1.36″4.88″3.50″2.00″.250″2.12″.50″0.96″1.31″0.69″1.06″0.75″4
1-1/4″1.70″5.25″3.88″2.50″.250″2.50″.56″1.28″1.37″0.81″1.12″0.75″4
1-1/2″1.97″6.12″4.50″2.88″.250″2.75″.62″1.50″1.50″0.88″1.25″0.88″4
2″2.44″6.50″5.00″3.62″.250″3.31″.69″1.94″1.69″1.00″1.44″0.75″8
2-1/2″2.94″7.50″5.88″4.12″.250″3.94″.75″2.32″1.87″1.12″1.62″0.88″8
3″3.57″8.25″6.62″5.00″.250″4.62″.81″2.90″2.06″1.25″1.81″0.88″8

SOCKET WELD CLASS 1500

Dimensions of socket weld flange class 1500 (in inches)

Socket Weld Flange Dimensions ASME B16.5

SOCKET WELD FLANGE SIZES IN MILLIMETERS

SOCKET WELD CLASS 150 

Socket weld flange dimensions class 150 in millimeters (ASME B16.5)

Socket weld flange dimensions

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
B2
mm
T2
mm
Y
mm
1/28930.235.111.215.722.415.79.7
3/49938.142.912.720.827.715.711.2
110849.350.814.226.734.517.512.7
11758.763.515.735.143.220.614.2
12765.073.217.540.949.522.415.7
215277.791.919.152.662.025.417.5
17890.4104.622.462.774.728.419.1
3191108.0127.023.978.090.730.220.6
216122.2139.723.990.2103.431.822.4
4229134.9157.223.9102.4116.133.323.9
5254163.6185.723.9128.3143.836.623.9
6279192.0215.925.4154.2170.739.626.9
8343246.1269.728.4202.7221.544.531.8
10406304.8323.930.2254.5276.449.333.3
12483365.3381.031.8304.8327.255.639.6
14533400.1412.835.1336.6359.257.241.4
16597457.2469.936.6387.4410.563.544.5
18635505.0533.439.6438.2461.868.349.3
20699558.8584.242.9489.0513.173.254.1
24813663.4692.247.8590.6616.082.663.5
SizeDrillingBolting
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

SOCKET WELD CLASS 300 

Socket weld flange dimensions class 300 in millimeters (ASME B16.5)

Socket weld flange dimensions

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
B2
mm
T2
mm
Y
mm
1/29538.135.114.215.722.422.49.7
3/411747.842.915.720.827.725.411.2
112453.850.817.526.734.526.912.7
13363.563.519.135.143.226.914.2
15569.973.220.640.949.530.215.7
216584.191.922.452.662.033.317.5
191100.1104.625.462.774.738.119.1
3210117.3127.028.478.090.742.920.6
229133.4139.730.290.2103.444.522.4
4254146.1157.231.8102.4116.147.823.9
5279177.8185.735.1128.3143.850.823.9
6318206.2215.936.6154.2170.752.326.9
8381260.4269.741.1202.7221.562.031.8
10445320.5323.947.8254.5276.466.533.3
12521374.7381.050.8304.8327.273.239.6
14584425.5412.863.8336.6359.276.241.4
16648482.6469.957.2387.4410.582.644.5
18711533.4533.460.5438.2461.888.949.3
20775587.2584.263.5489.0513.195.354.1
24914701.5692.269.9590.6616.0106.463.5
SizeDrillingBolting
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

SOCKET WELD CLASS 600 

Socket weld flange dimensions class 600 in millimeters (ASME B16.5)

Socket weld flange dimensions

Size
inch
D
mm
X
mm
G
mm
t
mm
B1
mm
B2
mm
T2
mm
Y
mm
1/29538.135.114.2B36.10/.1922.422.49.7
3/411747.842.915.7B36.10/.1927.725.411.2
112453.850.817.5B36.10/.1934.526.912.7
13363.563.520.6B36.10/.1943.228.414.2
15569.973.222.4B36.10/.1949.531.815.7
216584.191.925.4B36.10/.1962.036.617.5
191100.1104.628.4B36.10/.1974.741.119.1
3210117.3127.031.8B36.10/.1990.746.020.6
229133.4139.735.1B36.10/.19103.449.322.4
4273152.4157.238.1B36.10/.19116.153.823.9
5330189.0185.744.5B36.10/.19143.860.523.9
6356222.3215.947.8B36.10/.19170.766.526.9
8419273.1269.755.6B36.10/.19221.576.231.8
10508342.9323.963.5B36.10/.19276.485.933.3
12559400.1381.066.5B36.10/.19327.291.939.6
14603431.8412.869.9B36.10/.19359.293.741.4
16686495.3469.976.2B36.10/.19410.5106.444.5
18743546.1533.482.6B36.10/.19461.8117.349.3
20813609.6584.288.9B36.10/.19513.1127.054.1
24940717.6692.2101.6B36.10/.19616.0139.763.5
SizeDrillingBolting
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

TOLERANCE OF SOCKET WELD FLANGES

ASME B16.5 provides specific tolerances for socket-weld flanges, which are designed for small-size high-pressure piping. These tolerances ensure proper fit, alignment, and sealing capability within the piping systems. Socket-weld flanges have a recessed area where the pipe is inserted before being welded around the outer diameter. Below is a summary of general tolerance values for key dimensions of socket-weld flanges according to ASME B16.5. For precise values, especially for specific sizes and classes, consulting the ASME B16.5 standard is essential.

Diameter of Bolt Circle (P):

Tolerance: ±1.6 mm (±1/16 inch) for flanges up to and including NPS 24. This ensures even distribution of bolt loads and proper alignment.

Diameter of Bolt Holes (Q):

Tolerance: Typically, bolt holes are oversized relative to the bolt diameter by +3 mm (1/8 inch) to facilitate alignment and assembly.

Flange Thickness (T):

Tolerance: Can vary but a general guideline for flanges up to NPS 24 is ±3 mm (±1/8 inch). This tolerance accounts for the necessary strength and pressure containment without adding unnecessary weight.

Outside Diameter of Flange (O):

Tolerance: ±1.6 mm (±1/16 inch) for sizes up to NPS 24, ensuring compatibility with mating components and equipment.

Socket Depth (D):

Tolerance: The depth of the socket is crucial for ensuring that the pipe fits properly before welding. Tolerances ensure that there is enough room for the pipe to be inserted to the correct depth, facilitating a proper weld.

Bore Diameter (B):

Tolerance: The tolerance on the bore diameter ensures the flange will not impede fluid flow or cause excessive turbulence. The tolerance typically allows for a slight clearance over the outside diameter of the pipe, ensuring a fit that facilitates welding without excessive gap or interference.

Counterbore Diameter (G) and Depth:

Tolerance: Specific tolerances apply to the counterbore’s diameter and depth, ensuring the pipe sits properly within the flange socket for a secure weld.

Facing Finish:

Tolerance: The surface finish of the flange face is specified in terms of Ra (Roughness Average) to ensure compatibility with the gasket material and a proper seal. Tolerances are provided based on the type of facing and gasket used.

Adherence to these tolerances is critical for the functionality and integrity of the socket-weld flange connections. The correct implementation ensures proper alignment, weld quality, and sealing performance, contributing to the safety and reliability of the overall piping system. For detailed and specific tolerance values, it’s crucial to refer to the latest edition of ASME B16.5.

SW FLANGE WEIGHTS 

SW FLANGE WEIGHT in KGS.

The table shows the ASME B16.5 socket-weld (SW) 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
150
Class
300
Class
400
Class
600
Class
900
Class 1500
 1/20.91.40.90.92.72.7
 3/40.91.41.41.42.72.7
10.91.41.61.83.43.6
1.41.822.34.54.5
1.42.72.93.26.36.3
22.33.23.64.19.911.3
3.64.55.45.913.916.2
34.15.96.87.216.221.6
47.79.59.5
45.99.911.716.723.932.9
56.812.613.928.437.459.4
68.617.619.83649.574.3
813.526.130.251.877.4117
1019.436.54079.7110.3196.2
1228.851.858.596.8146.7300.2
1440.574.385116.6180423
1644.185.5113.9164.7206.6562.5
1858.5112.5139.5214.2291.2731.3
2074.3141.8170.1275.4356.4922.5
2283.3166.5182.3265.5
2499213.8242.6394.26661271

SW FLANGE WEIGHT in LBS.

The table shows the ASME B16.5 socket-weld (SW) 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 SizeSocket Weld Weight in Lbs./unit
½2
¾2
12
3
3
25
8
39
11
413
515
619
830
1043
1264
1490
1698
18130
20165
22185
24220
CLASS 300Nominal Pipe SizeSocket Weld Weight in Lbs./unit
½3
¾3
13
4
6
27
10
313
17
422
528
639
858
1081
12115
14165
16190
18250
20315
22370
24475
CLASS 400Nominal Pipe SizeSocket Weld Weight in Lbs./unit
½2
¾3
13.5
4.5
6.5
28
12
315
21
426
531
644
867
1091
12130
14191
16253
18310
20378
22405
24539
CLASS 600Nominal Pipe SizeSocket Weld Weight in Lbs./unit
½2
¾3
14
5
7
29
13
316
21
437
563
680
8115
10177
12215
14259
16366
18476
20612
22590
24876
CLASS 900Nominal Pipe SizeSocket Weld Weight in Lbs./unit
½6
¾6
17.5
10
14
222
31
336
453
583
6110
8172
10245
12326
14400
16459
18647
20792
241480
CLASS 1500Nominal Pipe SizeSocket Weld Weight in Lbs./unit
½6
¾6
18
10
14
225
36
348
473
5132
6165
8260
10436
12667
14940
161250
181625
202050
242825

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About the Author

Projectmaterials Team

Projectmaterials Team

Blog.projectmaterials.com is an online resource dedicated to providing in-depth information, analysis, and educational content related to the fields of project materials management, engineering, and procurement, particularly within the oil & gas, construction, shipbuilding, energy, and renewable energy sectors. It aims to serve professionals and enthusiasts in these industries by offering valuable insights into materials, equipment, and techniques used in various projects, focusing on the selection, application, and maintenance of these resources.Key features of the blog include:* Educational Articles: Comprehensive posts that cover topics ranging from the technical aspects of piping products (pipes, valves, fittings, flanges, gaskets, bolts, instrumentation) to structural steel and process equipment (including oil extraction systems, drilling rigs, wellheads, pumps, compressors, and separation systems). * Industry Insights: Updates on the latest trends, technologies, and regulatory changes affecting the industries covered. * Guides and How-Tos: Practical advice on selecting the right materials and equipment for specific applications, as well as tips on installation, maintenance, and troubleshooting. * Safety and Standards: Information on safety equipment for production sites, risk mitigation procedures, and an overview of relevant industry standards and regulatory frameworks.The website is designed to support the professional development of engineers, procurement specialists, project managers, and other stakeholders involved in project plant businesses, by disseminating critical know-how and best practices. Whether readers are new to the field or seasoned professionals, blog.projectmaterials.com offers resources to enhance their understanding and performance in managing project materials effectively.

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