BSP or NPT threads?
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  1. #1
    Rods 'n' Sods Junkie petespops's Avatar
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    QuestionBSP or NPT threads?

    I have a SBF alloy inlet manifold and need some unions and blanking plugs.

    Are they BSP or NPT threads?


    Cheers

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  3. #2
    richard rawlplug Torment's Avatar
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    probably npt (national pipe taper)...or something..

    bsp is british standard pipe...hope this helps...

    (unzips anorak,returns it to the cupboard.)


    The Oddlot Drag Racing Team...havin fun is usual
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  4. #3
    Official RnS Addict fozwanger's Avatar
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    In a nut shell, they are almost the same. A BSP will screw into an NPT hole and an NPT will screw into a BSP thred although there will only be a couple of threads with full engagement in both instances (i.e thread will not be of full strength).
    The only difference is the flank angle on the thread form. If my memory serves me correctly (poof, blow away cobwebs from my hydraulic days) the flank angle on a BSP is 60 deg and NPT is 55 deg.
    If it's yank then it'll be NPT although BSP fittings are easier to obtain over here. Good hydraulics shop will have both.
    Are the fittings under pressure (I mean anything above about 100 psi?) as gas is far more searching than a fluid so will need a getter fit.
    Hope this helps, sorry to waffle. If you want me to check flank angles for you let me know and I'll dig out mt thread charts.

    Jeff

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  6. #4
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    They are definitly NPT, I keep them in stock if you need. Some are 1/2" or 3/8"

  7. #5
    Official RnS Addict fozwanger's Avatar
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    There you go :-)

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