BSP threads seal in the same ways as NPT threads but are different dimensions, just, it sometime seems, to make life complicated for the distributor. BSP is very common on many types of European equipment as well as some Japanese machinery. The differences between BSP and NPT threads are detailed in the chart at the end of this section. BSP threads may be tapered but more often are parallel threads, with females relying on a cone seat for sealing. Male parallel threads seal with a chamfered end on a female with a cone seat, or with a copper gasket on a flat seat, with an o-ring in a recessed port, or finally with a bonded seal in a machined face port.

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