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  1. #1
    Silver Member
    Join Date
    Aug 2001
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    245

    Default shear bolt grades

    I sent a family member to the hardware store to get a few extra shear bolts for my snowblower. The manual calls for grade 2. They came back with 8.8 metric bolts. That's all they had in the size I needed but I thought 8.8 was equal to a grade 5. Who's right, here ?

  2. #2
    Old Timer Soundguy's Avatar
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    Mar 2002
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    51,530
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: shear bolt grades

    If you like your tractor an implements.. you should only use grade 2 shear bolts... Unles sthe manual specifically calls for somehting else.

    If that hardware store only has grade 5.. shop elsewhere.. your tractor is to expensive to let a 50 cent bolt rip the rear end out of it..

    Soundguy

  3. #3
    Veteran Member BillyP's Avatar
    Join Date
    Dec 2002
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    1,769
    Location
    Eagletown, OK
    Tractor
    JD 4610 ehydro MFWD

    Default Re: shear bolt grades

    You are right, an 8.8 metric is equal to a grade 5 SAE. If your manual calls for grade 2 SAE then that's what you should use.

    I have a tiller that calls for 8.8 shear bolts and it came with a package of 4 spares. I've had to use one spare so far (3 years).

  4. #4
    Silver Member
    Join Date
    Aug 2001
    Posts
    245

    Default Re: shear bolt grades

    I might add that the original shear bolt had a triangle stamped on the head. In metric terms that must have been equal to a grade 2. It's the first one I've ever seen. Last winter I caught a rock and stalled the tractor, the bolt did not shear off ! The assembly was rusted tight. I cleaned it up and lubed everthing. The bottom line is ; make sure those parts are free to move or the shear bolt is useless. Same for a slip clutch. If the clutch packs are rusted or frozen they can't work.That's why you don't see slip clutches on snowblowers.

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