Al-Ko Trailer Tongue failure
Remember that "tensile strength" measures a bolt under a longitudinal load. What you are seeing in this instance is a failure under "shear load." Two entirely different situations, and one of the main reasons that aircraft bolts (AN) are not the same as "Grade 8" or the European (DIN) equivalent. High tensile strength bolts often exhibit less than desirable brittleness under shear load.
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