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Mortise, Tenon, and Beyond: The Joinery Quiz
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What is the purpose of the square shoulder directly beneath the rounded head of a carriage bolt?
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Hint
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⚖️
50-50
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Audience
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A
To prevent the bolt head from sinking too deep into soft timber
B
To grip into the wood or a square hole to prevent the bolt from turning when the nut is tightened
C
To provide a flat surface for a standard crescent wrench to hold
D
To distribute the clamping force over a wider surface area
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