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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
a lot really, the thread forms are different aswell, one has 60 degree inc flanks and the other is a whitworth form of 55 degree inc angles. Bsp has the whitworth form of 55 degree angles.
Bsp is a parrallel thread form where the NPT is a tapered form that runs at 1'47" taper
The NPT is 27 tpi where the Bsp is 28 tpi
Unless you meant to say Bspt which is different again