API 6B
Type 6B Flanges for 5000 PSI Rated Working Pressure
HUB AND BORE DIMENSIONSNominal Size and Bore of FlangeHub Length Threaded Line-Pipe FlangeHub Length Threaded Casing FlangeHub Length Tubing FlangeHub Length Welding Neck Line-Pipe FlangeNeck Diameter Welding Neck Line-Pipe FlangeToleranceMax. Bore of Welding Neck FlangeMaximum BoreOutsde Diameter of FlangeToleranceMaximum ChamferDiameter of Raised FaceTotal Thickness of FlangeBasic Thickness of FlangeDiameter of HubDiameter of Bolt CircleNumber of BoltsDiameter of BoltsDiameter of Bolt HolesBolt Hole Tolerance (see note)Length of BoltsRing Number. R or RX
L1L2L3L4 ± 0.06AABBDDCFTGAP
2.1/162.56-2.564.312.38+0.09 / -0.031.722.098.50±0.060.124.881.811.504.126.5087/81.00+0.066.0024
2.9/162.81-2.814.442.88+0.09 / -0.032.162.599.62±0.060.125.381.941.624.887.50811.12+0.066.5027
3.1/83.19-3.194.943.50+0.09 / -0.032.653.2210.50±0.060.126.622.191.885.258.0081.1/81.25+0.067.2535
4.1/163.883.883.885.194.50+0.09 / -0.033.474.2812.25±0.060.127.622.442.126.389.5081.1/41.38+0.068.0039
5.1/84.444.44-6.445.56+0.09 / -0.084.345.1614.75±0.060.129.003.192.887.7511.5081.1/21.62+0.0610.0044
7.1/165.065.06-7.136.63+0.16 / -0.035.227.1615.50±0.120.259.753.623.259.0012.50121.3/81.50+0.0610.7546
96.066.06-8.818.63+0.16 / -0.036.849.0319.00±0.120.2512.504.063.6211.5015.50121.5/81.75+0.0912.0050
116.696.69-10.4410.75+0.16 / -0.038.5311.0323.00±0.120.2514.634.694.2514.5019.00121.7/82.00+0.0913.7554
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