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ASME B16.5 Lap Joint Flange Dimension Lookup
Select a nominal pipe size and pressure class to read the key drilling dimensions for a lap joint backing flange. Because ASME B16.5 drilling is shared across flange types, these bolt circles also match your weld-neck and blind flanges at the same size and class.
Request the full ASME B16.5 dimension chart and matched stub-end schedule →
Source: ASME B16.5 — Pipe Flanges and Flanged Fittings (NPS 1/2–24, Class 150 and 300 carbon-steel lap joint pattern). 1 inch = 25.4 mm. Class 600 and above ship in the downloadable spec sheet.
