Socket weld flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47. Socket weld flanges are available only up to 3″ NPS Size.

During a dimensional inspection of socket weld flange, you should check for

  • Outer & Inner Diameter of body
  • Bolt Circle & Bolt Hole Diameter
  • Depth of the socket
  • Length of the Hub and
  • Straightness and alignment of the bolt hole
socket weld flange dimensions

Class 150 Socket Neck Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 90 9.6 30 14 34.9 2 10 60.3 22.2 4 1/2 50 55 5/8 M14 0.8
3/4 20 100 11.2 38 14 42.9 2 11 69.9 27.7 4 1/2 50 65 5/8 M14 0.9
1 25 110 12.7 49 16 50.8 2 13 79.4 34.5 4 1/2 55 65 5/8 M14 0.9
1 1/4 32 115 14.3 59 19 63.5 2 14 88.9 43.2 4 1/2 55 70 5/8 M14 1.4
1 1/2 40 125 15.9 65 21 73 2 16 98.4 49.5 4 1/2 65 70 5/8 M14 1.4
2 50 150 17.5 78 24 92.1 2 17 120.7 61.9 4 5/8 70 85 3/4 M16 2.3
2 1/2 65 180 20.7 90 27 105 2 19 139.7 74.6 4 5/8 75 90 3/4 M16 3.2
3 80 190 22.3 108 29 127 2 21 152.4 90.7 4 5/8 75 90 3/4 M16 3.7

Class 300 Socket Neck Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 95 12.7 38 21 34.9 2 10 66.7 22.2 4 1/2 55 65 5/8 M14 1.2
3/4 20 115 14.3 48 24 42.9 2 11 82.6 27.7 4 5/8 65 75 3/4 M16 1.4
1 25 125 15.9 54 25 50.8 2 13 88.9 34.5 4 5/8 65 75 3/4 M16 1.4
1 1/4 32 135 17.5 64 25 63.5 2 14 98.4 43.2 4 5/8 70 85 3/4 M16 1.8
1 1/2 40 155 19.1 70 29 73 2 16 114.3 49.5 4 3/4 75 90 7/8 M20 2.7
2 50 165 20.7 84 32 92.1 2 17 127 61.9 8 5/8 75 90 3/4 M16 3.2
2 1/2 65 190 23.9 100 37 105 2 19 149.2 74.6 8 3/4 85 100 7/8 M20 4.6
3 80 210 27 117 41 127 2 21 168.3 90.7 8 3/4 90 110 7/8 M20 5.9
Piping Courses

Class 600 Socket Neck Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 95 14.3 38 22 34.9 7 10 66.7 22.2 4 1/2 75 5/8 M14 1.3
3/4 20 115 15.9 48 25 42.9 7 11 82.6 27.7 4 5/8 90 3/4 M16 1.4
1 25 125 17.5 54 27 50.8 7 13 88.9 34.5 4 5/8 90 3/4 M16 1.8
1 1/4 32 135 20.7 64 29 63.5 7 14 98.4 43.2 4 5/8 95 3/4 M16 2.3
1 1/2 40 155 22.3 70 32 73 7 16 114.3 49.5 4 3/4 110 7/8 M20 3.2
2 50 165 25.4 84 37 92.1 7 17 127 61.9 8 5/8 110 3/4 M16 4.1
2 1/2 65 190 28.6 100 41 105 7 19 149.2 74.6 8 3/4 120 7/8 M20 5.9
3 80 210 31.8 117 46 127 7 21 168.3 90.7 8 3/4 125 7/8 M20 7.3

Class 1500 Socket Neck Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 120 22.3 38 32 34.9 7 10 82.6 22.2 4 3/4 110 7/8 M20 1.8
3/4 20 130 25.4 44 35 42.9 7 11 88.9 27.7 4 3/4 115 7/8 M20 2.3
1 25 150 28.6 52 41 50.8 7 13 101.6 34.5 4 7/8 125 1 M24 3.7
1 1/4 32 160 28.6 64 41 63.5 7 14 111.1 43.2 4 7/8 125 1 M24 4.1
1 1/2 40 180 31.8 70 44 73 7 16 123.8 49.5 4 1 140 1 1/8 M27 5.5
2 50 215 38.1 105 57 92.1 7 17 165.1 61.9 8 7/8 145 1 M24 9.8
2 1/2 65 245 41.3 124 64 105 7 19 190.5 74.6 8 1 160 1 1/8 M27 16.4
3 80 265 47.7 133 N/A 127 7 203.2 N/A 8 1 1/8 180 1 1/4 M30 21.8

Disclaimer –  Please check with ASME B16.5 Before using.