Tap and die help needed
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  1. #1
    Rods 'n' Sods Junkie
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    wheelie is offline

    Tap and die help needed

    Hey Guys,

    I need to tap a hole to fit a 1/2" x 18 bolt, but nowhere seems to sell taps this size. Have I got a really odd size bolt or am I not looking in the right places for a tap?

    Ta, Ady

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  3. #2
    Rods 'n' Sods Junkie goldigger's Avatar
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    Have you tried these?

    RDGTOOLS

    TELEPHONE 01422 845222
    They have an online shop and also sell on fleabay
    Nige
    My wife says I never listen to her.....at least I think that's what she said.

  4. #3
    Semi Proffessional Prat sidspop's Avatar
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    What's it off. UK or US?

    Just had a look through my bible, and it's none of the usual ones.
    Any chance you could drill and cut a new thread such as M14?
    Last edited by sidspop; 18-03-2010 at 23:51.

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  6. #4
    Official RnS Addict fozwanger's Avatar
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    Sounds like a whit thread. Tracy tools is another or ebay?

  7. #5
    Official RnS Addict v8ian's Avatar
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    im fairly sure 1/4 NPT is 1/2"od x 18tpi, it may also be a UK conduit thread? ll have a look tomorrow and see if I have a tap

  8. #6
    Rods 'n' Sods Junkie
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    Hi V8Ian,

    1/4 NPT makes sense as my bolt size measurer would only go half way up the thread in the 1/2" hole. It's an American throttle cable with a threaded bolt attached. How do you tap out a tapered thread or is the tap the same diameter through it's whole length?

    Thanks.

  9. #7
    Official RnS Addict v8ian's Avatar
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    NP & NPT, or it may be NPT & NPTT, cant remember, National Pipe,& National Pipe Taper, then it may be National Pipe Thread, and National Pipe Taper Thread, havent had time to check my boxes of taps yet.

  10. #8
    Official RnS Addict trevd's Avatar
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    it might be 1/4 npt, that is about 1/2" and 18 tpi. im sure i have 1/4 npt taps in the workshop, i will have a look in the morning, could pop one in the post for you to borrow (cheaper than buying one just for one hole). all it will cost is the postage and a donation to charity.

  11. #9
    Rods 'n' Sods Junkie
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    that would be fantastic thanks

  12. #10
    Official RnS Addict trevd's Avatar
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    i had a look and i have bspt but not npt (npt is the american thread) i will see if i can find one at work monday, if i can i will borrow it for you.

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