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Thread: Bedford Taper Thread Query

  1. #1
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    Default Bedford Taper Thread Query

    Probably a daft question to some . I'm in the process of making some new Rocker cover studs for the MW and the 3\8" UNC thread on the stud is tapered . The query I have is .............. will the thread in the head be parallel ? if I re cut the new stud with a std die will it suffice ? as its not a sealing joint................. or is it .

    What's the reason for using a tapered thread for the rocker cover stud ? I thought a std parallel thread would have been sufficient .


    Dave
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  3. #2
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    Default Re: Bedford Taper Thread Query

    Try a known parallel thread bolt in the head to see if it locks before bottoming out. Tappered threads will provide a mechanical thread lock for the stud so that the unf nut on the top undoes first.
    Last edited by john1950; 18-05-2017 at 10:09.

  4. #3
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    Smile Re: Bedford Taper Thread Query

    I very much doubt if you in fact have a tapered thread. They look a machine cut thread , so it is just due the short length of thread using a chaser (probably a Coventry Diehead used or such as Kendel & Gent screw machine chasers ) ,,
    FULLTILT

  5. #4
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    Default Re: Bedford Taper Thread Query

    Thanks John

    Quote Originally Posted by john1950 View Post
    Try a known parallel thread bolt in the head to see if it locks before bottoming out. Tappered threads will provide a mechanical thread lock for the stud so that the unf nut on the top undoes first.
    1942 Willys MB Script
    Nov 1943 MBT Trailer
    1944 Para Bicycle
    1942 Welbike Mk2 Series 1
    1943 Bedford MW
    1944 RE Flying Flea

  6. #5
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    Default Re: Bedford Taper Thread Query

    Are you sure that's a UNC thread? I would have thought more likely to be Whitworth. Same 16 tpi but a different thread form. I would also think that the finer thread for the nuts will be BSF. Just a thought. Ron
    Morris PU8/4 1940
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  7. #6
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    Default Re: Bedford Taper Thread Query

    Quote Originally Posted by Ron View Post
    Are you sure that's a UNC thread? I would have thought more likely to be Whitworth. Same 16 tpi but a different thread form. I would also think that the finer thread for the nuts will be BSF. Just a thought. Ron
    No British threads on a Bedford, all NF and NC
    Richard Farrant

    1943 Bedford QLD - 1941 BSA WM20 - 1943 Daimler Scout Car Mk.2
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  8. #7
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    Default Re: Bedford Taper Thread Query

    Thanks for that . I thought it was a taper ,when I held it against a flat it gave me that impression . Reading your response I can see what you mean by a short thread with a chaser . Thanks again

    Dave
    Quote Originally Posted by ruxy View Post
    I very much doubt if you in fact have a tapered thread. They look a machine cut thread , so it is just due the short length of thread using a chaser (probably a Coventry Diehead used or such as Kendel & Gent screw machine chasers ) ,,
    1942 Willys MB Script
    Nov 1943 MBT Trailer
    1944 Para Bicycle
    1942 Welbike Mk2 Series 1
    1943 Bedford MW
    1944 RE Flying Flea

  9. #8
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    Default Re: Bedford Taper Thread Query

    Quote Originally Posted by Richard Farrant View Post
    No British threads on a Bedford, all NF and NC
    Cheers Richard, you learn something everyday. I've never owned a Bedford. I have a Morris and Austin and loads of other stuff and the only general NF and NC is on my Jeep. Ron
    Last edited by Ron; 19-05-2017 at 04:20.
    Morris PU8/4 1940
    Austin Tilly 1942
    Willys MB 1942 (British)
    U/C MK2 1944
    2 Pounder anti tank gun 1941
    24 motorcycles 1939-44
    BSA parabike

  10. #9
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    Default Re: Bedford Taper Thread Query

    General Motors owned Bedford from 1932, iirc, so much North American influence.
    Tanks are mighty fine things
    1939 Caterpillar D4
    1944 M5 High speed tractor
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