Where to find mounting bolts?

Discussion in 'General Questions' started by caprirs302, Aug 23, 2009.

  1. caprirs302

    caprirs302 New Member

    Okay, so i had replaced the factory studs with American bolts, but nonetheless the torque of the motor managed to shear off one of the mounting bolts.

    Now I am in the midst of finding a stronger replacement bolts so that hopefully this doesn't happen again, but when I went to my local hardware store, they said that they didn't carry any "grade 8" metric bolts. Is there such a thing? If so, where can I track down some hardened metric bolts?
     

  2. Al.Fisherman

    Al.Fisherman Active Member

    Metric bolt grades and torque specs..

    Bolt size....Low Grade....Grade 8.8....Grade 10.9....Grade 12.9
    6mm............3-5................7..............10....................12
    8mm...........8-12..............17..............24....................29
    10mm........15-22..............33..............47....................57
    12mm............39...............59..............83..................100
    14mm............60..............101............131..................158
     
    Last edited: Aug 23, 2009
  3. GearNut

    GearNut Active Member

    Are those torque specs in inlb, ftlb, or nm?
     
  4. Al.Fisherman

    Al.Fisherman Active Member

    Sorry...that would help....Foot #'s
     
  5. mattysids

    mattysids Member

    Sick Bike Parts carries a kit based on replacing all of the old studs coming off the engine and all other screws/bolts for $10
     
  6. Porkchop

    Porkchop Member

    So what is this telling us ? Are these torque settings for the stated grade and size bolts for these engines only ? I'd be afraid to torque anything to 158 ft/lbs on these engines. The bolt it's self may take it, but I don't think the engine block would. I too need to know as I'm fixing to replace all factory nuts and bolts on a Grubee. Thanks !
     
  7. Al.Fisherman

    Al.Fisherman Active Member

    I did a edit but it didn't post. This chart shows what he was asking about grades. I had posted that I, myself wouldn't go beyond the 8.8. The stud would take it but the case wouldn't. I delt with Volkswagen's back in the early 80's and had a problem with studs pulling out of the block. Had to either use over size studs or a heli coil.
     
  8. Porkchop

    Porkchop Member

    Thanks for clarifying. I'm a firm believer in torque wrenches.
     
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