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Does BSP designate a parallel or tapered thread?

Does BSP designate a parallel or tapered thread?

Does BSP designate a parallel or tapered thread?

(OP)
Hi all,

Long time reader, first time poster here. I have a quick question regarding the way in which BSPP and BSPT threads can be called out on drawings.

Where I work, I can often come across sockets and ports on manifolds labelled as 1/8" BSP (mainly on older drawings), for example, and I can't find any references anywhere or a definite answer as to whether that refers to a parallel or tapered thread. It seems to me that it could leave the interpretation wide open, and getting the same part from different manufacturers could lead to parts with two different thread forms.

I basically was just wondering whether, within the experiences of everyone on this site, whether there is an unspoken understanding that calling out the thread BSP (rather than BSPP or BSPT, 'Rc' or 'G') makes it either one or the other, or whether it is completely ambiguous (as it seems to me)? Any thoughts would be much appreciated.

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