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Thread: Which bolt material for upper shock mount?
          
   
   

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  1. #14
    wingman9's Avatar
    wingman9 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: '32 Ford Tudor
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    Quote Originally Posted by enjenjo View Post
    That is an old wives tale. A grade 5 bolt will bend, and break, before a grade 8 bolt will even bend. A grade 8 bolt is nearly 50 percent stronger in shear than a grade 5 bolt.
    I stand corrected. Upon further review...

    “As an empirical guide, shear strengths of carbon steel fasteners may be assumed to be approximately 60 percent of their specified minimum tensile strengths. For example, an SAE grade 5 hex cap screw has a specified minimum tensile strength of 120,000 psi. Therefore, for design purposes, its shear strength could be reasonably assumed to be 70,000 psi.”
    The Industrial Fastener Institute (Inch Fastener Standards, 7th ed. 2003. B-8)

    Since the tensile strength of a grade 8 bolt is considerably higher the shear strength must be as well. Consider this chart:
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    Hans
    If you can't use me as a good example, then use me as a horrible warning.

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