Stem bolts

dan shard
dan shard Posts: 722
edited December 2010 in MTB workshop & tech
My stem bolts, both at the bar end and the headset end are looking a little rusty and need replacing, but they seem to be a very strange size (23mm long) is this normal? and if so are there any replacement kits made specifically for stems? I cant be bothered hacksawing them down as it will probably chew the thread up and then wreck the stem thread so was hoping to be able to buy them made to measure.

I havent found any 23mm bolts on any site Ive looked at so far...

TIA

Comments

  • dan shard
    dan shard Posts: 722
    Oh and before I forget, I also dont fancy using 6 washers :D
  • nicklouse
    nicklouse Posts: 50,673
    yes there are many kits out there. yes 23mm is a standard length.

    but there are many different sized bolts used in stems. so you will nee to get all the correct infos. bolt size M4,M6 or... then the thread pitch and of cause the length.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • dan shard
    dan shard Posts: 722
    Its an M6 cap head. Not seen anywhere I can buy them from though..

    /Edit
    At 23mm long, even ebay
  • 02gf74
    02gf74 Posts: 1,171
    stem bolts I've seen have always been high tensile 12.9 or 14.0 ; do not fit any old bolt.
  • redvee
    redvee Posts: 11,922
    Some suppliers give the bolt measurement including the head. Have a look at Westfield Fasteners. They seem to have risen from the ashes of Stagonset.
    I've added a signature to prove it is still possible.
  • konadawg
    konadawg Posts: 447
    No big deal, 25/23 what's with 2mm poking out the back (likely won't anyway).

    Must ask are yo measuring properly (sorry) it's the thread only that wants measuring not the OAL.

    The standard issue bolts are usually hypercrap, as are most bolts you find on bikes, any half decent s/s or regular steel even basic 8.8 grade will be far stronger than the norm.
    Giant Reign X1
  • dan shard
    dan shard Posts: 722
    Im a graduate mechanical engineer so no worries on the thread measurement :D

    Im replacing them with 316 s/s but after trying to fit them last night it appears that they are rather bespoke as although the thread is M6 the head is 5mm so a standard m6 wont fit into the recess

    grrrrr
  • dan shard
    dan shard Posts: 722
    On the plus side it means Ive got something new to look at on ebay as I'll probably end up looking at carbon stems now to replace the easton ea30
  • The Rookie
    The Rookie Posts: 27,812
    02GF74 wrote:
    stem bolts I've seen have always been high tensile 12.9 or 14.0 ; do not fit any old bolt.
    Either of which is really stupid to use for a stem unless expensively coated, the hydrogen embrittlement could literally prove fatal, certainly painful, 10.8 max.

    Simon
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • konadawg
    konadawg Posts: 447
    dan shard wrote:
    although the thread is M6 the head is 5mm so a standard m6 wont fit into the recess

    grrrrr

    Ahhh, those. :(
    Giant Reign X1

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