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Blade bolt broken off inside spindle

Discussion in 'Mechanic and Repair' started by IES, May 1, 2013.

  1. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,887

    Future advice. On spindle mounts, blades or anything else subject to corrosion I use premium bolts. Step up to grade 8 or stainless fasteners. Removing broken bolts is one of my least favorite, avoidable repairs.
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  2. Nate'sLawnCare

    Nate'sLawnCare LawnSite Bronze Member
    Posts: 1,001

    I would agree with the grade 8, but I avoid stainless fasteners on applications where they are removed and reinstalled repeatedly. The stainless does not do well in those types of situations, the threads deteriorate and the bolt may get stuck in place after repeated removals. I always put a little grease or never-seize on spindle bolts before reinstalling.
  3. BleedingGreen

    BleedingGreen LawnSite Member
    from SE MI
    Posts: 165

    While I like stainless steel hardware for rust related issues, NEVER use stainless in any applications that are under a lot of stress, jarring/jolts, certainly not to hold a spinning mower blade on. Stainless is rather brittle in comparison to other metals and have a tendency to snap or shear off under these conditions. A zinc coated grade 8 bolt with anti-seize is the best option.
  4. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,887

    Stainless fasteners are available in many grades and far from weak or brittle. Grade tells the whole story. Zinc coatings will chip off just from wrenching and anti seize will give false torque readings. There's a reason why its used so much in aerospace and weapons manufacturing and its not just corrosion resistance.
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    Last edited: May 4, 2013

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