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  1. #1
    car dodger norskagent's Avatar
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    stripped stem bolt solution

    What do you guys think of this fix for a stripped stem bolt (stripped threads) vs retapping the hole?
    http://www.emhart.com/products/helicoil/standard.asp
    I don't think retapping will work for my stem, unless I enlargen the bolt head area also...the helicoil method would use the same size bolt.

  2. #2
    Sometimes knows stuff. rmfnla's Avatar
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    The biggest downside is buying the tools, but if done properly the repair will be stronger than the original and you will be able to use the original bolts.
    Today, I believe my jurisdiction ends here...

  3. #3
    car dodger norskagent's Avatar
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    my auto mechanic has the tools, and offered to do the fix. Just wanted some opinions here first, so far it looks pretty good.

  4. #4
    "Purgatory Central" Wino Ryder's Avatar
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    [QUOTE]
    Quote Originally Posted by norskagent
    What do you guys think of this fix for a stripped stem bolt (stripped threads) vs retapping the hole?


    There is no retapping the hole in conventional stems. What you're retapping is the metal wedge anchor the stem bolt threads into, which is separate from the stem. Thats why the bolt is so long. But yeah, you could retap the wedge anchor and screw in the heli-coil. But once you got that far with it, would'nt it be easier to just replace the wedge?


    just my thoughts
    ~ "I like the way the brake cables come out of the top of the levers and loop around to the brake calipers!...I like those downtube shifters too!...No no no, don't take 'em off, don't take 'em off,...leave 'em on, leave 'em on! - Thats right baby!!

    ~BF - Steel Club Member #00051

  5. #5
    Sometimes knows stuff. rmfnla's Avatar
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    [QUOTE=Wino Ryder]



    There is no retapping the hole in conventional stems. What you're retapping is the metal wedge anchor the stem bolt threads into, which is separate from the stem. Thats why the bolt is so long. But yeah, you could retap the wedge anchor and screw in the heli-coil. But once you got that far with it, would'nt it be easier to just replace the wedge?


    just my thoughts

    You are assuming he stripped the wedge on a quill-type stem; I assumed he meant one of the bar clamp bolt holes.

    Maybe we should ask for clarification before we go any further?
    Today, I believe my jurisdiction ends here...

  6. #6
    car dodger norskagent's Avatar
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    I'm sorry, I should have clarified - it's the stem clamp bolt hole that is stripped, and the stem is an OS threadless. The clamp is 2 bolt.

  7. #7
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    I wonder if there is enough metal around the stripped hole to allow drilling and tapping it oversize for a helicoil. A lot of the threadless stems I'm familiar with don't have a lot of "meat" around the bolt holes.

    If the bolt isn't threaded into a "blind" hole but the stripped hole is drilled all the way through you could drill out the hole to a clearance size for the bolt (usually 5 mm so a 7/32" drill bit will work) and then use a longer bolt and nut.

  8. #8
    "Purgatory Central" Wino Ryder's Avatar
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    Quote Originally Posted by norskagent
    I'm sorry, I should have clarified - it's the stem clamp bolt hole that is stripped, and the stem is an OS threadless. The clamp is 2 bolt.

    I guess I'm a bit old school. When someone says "stem bolt hole" I'm thinking old quill stem that uses the long bolt. But yeah, the heli-coil would sure enough work on your stripped handlebar clamp. It would greatly increase the clamping strength over the threaded aluminum. In fact, if you do one hole, then do the other holes too.
    ~ "I like the way the brake cables come out of the top of the levers and loop around to the brake calipers!...I like those downtube shifters too!...No no no, don't take 'em off, don't take 'em off,...leave 'em on, leave 'em on! - Thats right baby!!

    ~BF - Steel Club Member #00051

  9. #9
    car dodger norskagent's Avatar
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    my local bike store was concerned that the steel sleeve of the helicoil would still strip out of the aluminum clamp hole, being so small...

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