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No they aren't - BSP are similar overall dimension to NPT, 1/4" BSP is typically around 3/8" ID and 1/2" OD.
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Really? I have barbs here with 1/2" (well, 16mm really) OD on the thread, and 3/8" ID. They were sold to me as 3/8" BSP thread barbs. I get the impression there are as many variations as there are barbs...