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 InchSize in mmOuter Dia.Flange Thick.Hub ODFlange LengthRF Dia.RF HeightSocket DepthPCDSocket BoreNo of BoltsBolt Size UNCMachine Bolt LengthRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDEFGHJ
1/215909.6301434.921060.322.241/250555/8M140.8
3/42010011.2381442.921169.927.741/250655/8M140.9
12511012.7491650.821379.434.541/255655/8M140.9
1 1/43211514.3591963.521488.943.241/255705/8M141.4
1 1/24012515.965217321698.449.541/265705/8M141.4
25015017.5782492.1217120.761.945/870853/4M162.3
2 1/26518020.79027105219139.774.645/875903/4M163.2
38019022.310829127221152.490.745/875903/4M163.7

Class 300 Socket Neck Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.Hub ODFlange LengthRF Dia.RF HeightSocket DepthPCDSocket BoreNo of BoltsBolt Size UNCMachine Bolt LengthRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDEFGHJ
1/2159512.7382134.921066.722.241/255655/8M141.2
3/42011514.3482442.921182.627.745/865753/4M161.4
12512515.9542550.821388.934.545/865753/4M161.4
1 1/43213517.5642563.521498.443.245/870853/4M161.8
1 1/24015519.1702973216114.349.543/475907/8M202.7
25016520.7843292.121712761.985/875903/4M163.2
2 1/26519023.910037105219149.274.683/4851007/8M204.6
3802102711741127221168.390.783/4901107/8M205.9
Piping Courses

Class 600 Socket Neck Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.Hub ODFlange LengthRF Dia.RF HeightSocket DepthPCDSocket BoreNo of BoltsBolt Size UNCRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDEFGHJ
1/2159514.3382234.971066.722.241/2755/8M141.3
3/42011515.9482542.971182.627.745/8903/4M161.4
12512517.5542750.871388.934.545/8903/4M161.8
1 1/43213520.7642963.571498.443.245/8953/4M162.3
1 1/24015522.3703273716114.349.543/41107/8M203.2
25016525.4843792.171712761.985/81103/4M164.1
2 1/26519028.610041105719149.274.683/41207/8M205.9
38021031.811746127721168.390.783/41257/8M207.3

Class 1500 Socket Neck Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.Hub ODFlange LengthRF Dia.RF HeightSocket DepthPCDSocket BoreNo of BoltsBolt Size UNCRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDEFGHJ
1/21512022.3383234.971082.622.243/41107/8M201.8
3/42013025.4443542.971188.927.743/41157/8M202.3
12515028.6524150.8713101.634.547/81251M243.7
1 1/43216028.6644163.5714111.143.247/81251M244.1
1 1/24018031.8704473716123.849.5411401 1/8M275.5
25021538.11055792.1717165.161.987/81451M249.8
2 1/26524541.312464105719190.574.6811601 1/8M2716.4
38026547.7133N/A1277203.2N/A81 1/81801 1/4M3021.8

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

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