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  1. #41
    rv is offline
    Join Date
    Dec 2000
    Hawthorn Woods, IL
    I contacted Hillman Fasteners (large supplier for typical hardware store). I spoke with their quality engineer regarding the shear strength of their 7/16" stainless bolt. He indicated it was 6,300#'s. The bolts are ~ a grade 5 bolt. They tested from 100,000 to 150,000# (grade 5 is 120,000).

    For the engine mount at the L bracket that would be a shear situation. 6,300 * 12 bolts = 75,600#'s.

    Assume 5 G's of force from big wave:
    1,200#'s * 5 = 6,000#'s for engine

    Assume safety factor of 4:
    75,600 / 4 = 18,900#'s

    Seems like that should hold and still have room if assumptions are off a little.

  2. #42
    Registered 2112's Avatar
    My Boats:
    04' Gladiator powered by Ford
    Join Date
    Dec 2003
    Socialist Republic of Washington State
    I would never argue a stainless bolt is a tough as Grade 8 but this logic sounds reasonable. I would also assume that if the bolts were replaced with new on each and every R&R, the chances of shearing would be even smaller. Factor in larger diameter than 7/16ths and get an even smaller chance.

    Thanks RV

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