Best bolts you can buy?

Discussion in 'Lawn Mowing' started by Envy Lawn Service, Apr 15, 2004.

  1. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Messages: 11,062

    I need some really high quality, really strong 5/16 bolts. What kind/grade do I need to buy? I snapped one from Lowes which was just a standard bolt (long story).
  2. specialtylc

    specialtylc LawnSite Bronze Member
    Messages: 1,656

    Caterpillar Tractors use a grade #9. or just go back to Lowes and get the grade #8.
  3. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Messages: 11,062

    OK, thanks.... looks like my thinking was backwards. I would have thought the cheaper bolts would be softer and just bend instead of snapping in half.
  4. relakst

    relakst LawnSite Member
    from Canada
    Messages: 27

    Try aircraft-grade bolts.
  5. grassredneck

    grassredneck LawnSite Member
    Messages: 150

    Grade 8 bolts should be plenty strong enough, if they aren't strong enough-I'd suggest going to a specialty supply store that specializes in fasteners
  6. Luscious Lawns

    Luscious Lawns LawnSite Member
    Messages: 133

    Grade 8 bolts have 5 raised "stars" on the heads. They should be strong enough for most L/S engineering. Try checking if some other fastner has failed and is shifting the load to the bolt that is actually failing.
  7. DennisF

    DennisF LawnSite Bronze Member
    from Florida
    Messages: 1,381

    If you need some really good bolts, look into a company called ARP. They make all sorts of different fasteners for high performance applications. But they are expensive.
  8. rookiemower

    rookiemower LawnSite Senior Member
    Messages: 766

    different bolts work good in differernt applications, sometimes different grades are more brittle than others thats why some lower grades might be a little more flexible instead of just snapping which usually takes a whole sh*t load of pressure
  9. Shady Brook

    Shady Brook LawnSite Bronze Member
    from Indiana
    Messages: 1,517

    I am with Rookiemower, it depends on the application.

    If you have something that takes alot of abuse and shock, you may want a grade 5, a grade 8 will be stronger, but will be more inclined to shear. Look at the bolts on plow rigs...grade 5. Look at the bolts used to mount big strong trailer hitches...grade 5. I don't think there will be much need for anything beside a 5 in a lawn type application.


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