Technical data Standard Out Diameter Tolerance of Pipe End Tolerance of Pipe Body API 5L 219.1 273.1 +1.6mm, -0.4mm ±0.75% 274.0 320 +2.4mm, -0.8mm ±0.75% 323.9 457 +2.4mm, -0.8mm ±0.75% 508 +2.4mm, -0.8mm ±0.75% 559 610 +2.4mm, -0.8mm ±0.75% Standard Grade Out Diameter Wall Thickness API 5L A 219.1 457 +15%, -12.5% B 508 610 +17.5%, -12.5% X42-X80 508 610 +19.5%, -8%