Whitworth form thread

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Thread: Whitworth form thread

  1. #1
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    Default Whitworth form thread

    got a question maybe someone can help
    55 degree vs a 60 degree thread
    does anyone still do 55 degree thread?

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    Default Re: Whitworth form thread

    Hi,
    unless its a really critical high torque/load thread who cares? The only thread for which there is a clash between UNC and BSW is at 1/2 inch,
    the pitches are different.

    Craig



  3. #3

    Default Re: Whitworth form thread

    The difference is geometry.



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    Default Re: Whitworth form thread

    It's not a matter for strength - or rather a 60 degree PA nut if fitted on a 55 degree PA bolt would hold well enough for most purposes. Consider bearing: the line bearing of the 60-degree crest to the 55-degree root would lead to instant galling. The whole idea of matching pressure angles is to ensure and area bearing. There is always some mismatch the bearing is never perfect but metal is also a little forgiving. It will deflect and flow to a microscopic extent but not much; certainly not 5 degrees.
    If you can't think the problem through in a technical sense, try personally.
    Fitting Unified or DIN(?) 60-degree threads to 55 degrees Whitworth is a classic "a guy ole me.." piece of technical idiocy. I'm surprised anyone would seriously consider it - which is a caveat to noobs. Not everyone in an assured manner is worth listening to.



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    Default Re: Whitworth form thread

    thank you for the replies
    so i have been looking for a 2 1/4 x 4 tap and for some reason nobody sells them does some know where i can get one?
    thank you



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    Default Re: Whitworth form thread

    Hi,
    a 2-1/4 tap will cost a fortune even if you can get one. Not to mention the huge torque you be required to apply to cut the thread.
    Can you not cut it on a lathe or mill it?

    Craig



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    Default Re: Whitworth form thread

    Hi Cob - Do you mean a 2-1/4" diameter 4tpi tap in whitworth? Peter

    https://wallersindustrialonline.com/...RoC3qwQAvD_BwE

    try these guys Peter

    or these in USA - they have 2-1/4x4 tpi in their catalogue
    https://www.newmantools.com/taps/tapsbritish.htm



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    Default Re: Whitworth form thread

    Quote Originally Posted by cob View Post
    got a question maybe someone can help
    55 degree vs a 60 degree thread
    does anyone still do 55 degree thread?
    If you have a need or are repairing something then yes anything you want is available I have threading inserts for 55 degree thread cutting and most manufactures still make 55 degree carbide threading inserts and Taps

    If you have something that has a 55 degree thread then you will have to make the matching part or make both parts with 60 degree threads

    Mactec54


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    Default Re: Whitworth form thread

    thank you guys for all the sudjestion
    ( 2-1/4" diameter 4tpi tap in whitworth) yes this is the whitworth thread .
    yea I dont think i will be buying a tap, its to expensive,

    my next question is do you guys know if theres a place that sells nuts that are already threaded to 2-1/4 x 4tpi?

    thank you



  10. #10
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    Default Re: Whitworth form thread

    Quote Originally Posted by cob View Post
    thank you guys for all the sudjestion
    ( 2-1/4" diameter 4tpi tap in whitworth) yes this is the whitworth thread .
    yea I dont think i will be buying a tap, its to expensive,

    my next question is do you guys know if theres a place that sells nuts that are already threaded to 2-1/4 x 4tpi?

    thank you
    This company may be able to help they have those big sizes will most likely have to make it

    https://www.lawsonproducts.com/catal...jsp.sortByForm

    Mactec54


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