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Originally Posted by nexxo
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...
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Check the link posted by pauldenton - BSP is defined by the OD of the thread, not the ID. For reference a 3/8" BSP should be 0.656" (16.6624mm) OD so your barb is indeed a 3/8" BSP. 16mm isn't even close to 1/2" though.