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Thread: Front Suspension Thread Sizes

Discuss the Austin Healey Sprite and the MG Midget. Two different but similar cars sometimes referred to collectively as the Spridget.

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    Front Suspension Thread Sizes

    On the front suspension wishbone (sometimes called the A-arm), what are the thread sizes for the tubes that the fulcrum pin screws into? I make the small one to be 9/16-16 and the big one to be 5/5-16, but not sure.

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    Re: Front Suspension Thread Sizes

    I meant to type 5/8-16 and not 5/5-16.

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    Jedi Trainee Dug's Avatar
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    Re: Front Suspension Thread Sizes

    James, I wished it was that easy. The O.D. of the large thread is 0.650. It's over 5/8" and under 11/16" bit of an odd thread diameter.
    Dug
    59 MKI unmolested.
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    68 MKII mini van
    62 MKII sprite in waiting
    67 MKI Cooper S
    70 Midget


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    Re: Front Suspension Thread Sizes

    Dug: Thanks for the info. Just as I suspected, it's never a simple answer with these crazy little cars is it?
    I have some old A-arms laying around and thought I see what I could salvage by chasing the crud out of the threads by running a tap through. 0.650 spec's out to be right between 5/8 and 11/16 or 23/32. Probably not a size that I can go to my local Home Depot and get a 23/32-16 tap.

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    Yoda Jim_Gruber's Avatar
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    Re: Front Suspension Thread Sizes

    James,

    Send those A Arms over Peter C. and he can rebuild them for you. I've got to pull a pair off of a '67 that is being scrapped in Cincinnati in the next week or so and send them over to Peter C as well for Bugsy. Got a serious K-Chunk from LF Wheel when I hit a sewer lid. I'll have a fresh set of A-Arms to install and minimize down time especially with driving time fast approaching.
    Jim Gruber - Apollo Beach, FL
    Bugsy I - '68 Sprite w BE Bonnet - Gone but not forgotten
    Bugsy IV - '60 Bugeye - 1,275+.040 and a 5-Speed - CA Car - 2nd Owner from new - 10/12 Painting done, reassembly, cutting, and buffing in progress.

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    Re: Front Suspension Thread Sizes

    Jim; Thanks! Thats probably the best advice, just let someone who knows what he is doing handle it.

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    Great Pumpkin JPSmit's Avatar
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    Re: Front Suspension Thread Sizes

    Quote Originally Posted by James_the_elder
    Jim; Thanks! Thats probably the best advice, just let someone who knows what he is doing handle it.
    Although I must say advice like that has no place on a respectable board like this. After all, it disqualifies almost all of us. I say let the people (like me) who have no clue handle it!

    It's the LBC way.
    John-Peter Smit
    1976 MG Midget
    1969 Vauxhall Viva GT
    1958 Fiat Multipla (Barn art)

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    Yoda Jim_Gruber's Avatar
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    Re: Front Suspension Thread Sizes

    Since rebuild usually require a special $250+ reamer which MOSS now shows as NA. It's time to ship them off to be rebushed properly.
    Jim Gruber - Apollo Beach, FL
    Bugsy I - '68 Sprite w BE Bonnet - Gone but not forgotten
    Bugsy IV - '60 Bugeye - 1,275+.040 and a 5-Speed - CA Car - 2nd Owner from new - 10/12 Painting done, reassembly, cutting, and buffing in progress.

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