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Center-to-end tol.
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ASME B16.9 Elbow Dimension & Tolerance Calculator
Center-to-end and the B16.9 / B16.28 tolerance window for carbon steel (A234 WPB) buttweld elbows.
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center-to-end
OD at bevel tol.
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Min wall thickness
≥ 87.5% nominal
Radius rule
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Center-to-end computed from the ASME B16.9 / B16.28 radius rule (90 deg LR = 1.5 x NPS; SR = 1.0 x NPS; 45 deg = radius x tan 22.5 deg). Tolerances per ASME B16.9. Minimum wall (87.5% of nominal, no upper limit) per ASME B16.9 / U.S. DOE-OSTI. B16.9 is dimensional only and assigns no pressure rating — verify the pressure-temperature limit from the matching pipe schedule and governing piping code.
Request the full B16.9 dimension & tolerance sheet (PDF)
