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Thread: Suspension bolts tensile ratings

  1. #1
    Member cis6409's Avatar
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    Suspension bolts tensile ratings

    Hi guys
    I'm doing a front and rear suspension rebuild as part of my frame restoration.

    I'm Replacing the pivot and lower link bolts and wanna make sure I get the correct ones. What tensile or grade strength should i go for.? 10.9 or 12.9 or are they all imperial "graded" bolts.

    Thanks
    Shane
    only from the past can we choose the correct path for the future...

  2. #2
    Senior Member Rich's Avatar
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    I don't know the answer to the question. Two comments may help:

    A. Did you look for grading marks? The old ones may have their strength grade, at least if it is special-grade, embossed on each bolthead.

    B. Given your location perhaps getting in touch with DeloreanGo in the UK would be appropriate if you haven't pinged them already.

    Looks like they stock what you want. Here is a link to the first of their several Suspension parts pages.

    Other vendors certainly can sell you what you need, too.
    March '81, 5-speed, black interior

  3. #3
    LS Swapper Josh's Avatar
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    All the pivot bolts in the suspension are 1/2" Grade 8. Some are course thread, some are fine thread. Just replace them with that came out.

    Supercharged 5.3L LS4 + Porsche 6spd
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  4. #4
    Senior Member Bitsyncmaster's Avatar
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    Your old bolts should be marked as follows:

    https://www.fastenersuperstore.com/f...-head-markings
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    Member cis6409's Avatar
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    Thanks guys for the tips and info, that answers my question. Cool.


    Cheers
    Shane
    only from the past can we choose the correct path for the future...

  6. #6
    APRIL 81
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    Quote Originally Posted by Bitsyncmaster View Post
    Your old bolts should be marked as follows:

    https://www.fastenersuperstore.com/f...-head-markings
    Great resource. Thanks for posting this!
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