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Why do Coach Bolts Have a Bevelled Edge?

Postby collectors » Mon Aug 10, 2015 6:44 am

Just a daft question.
Why do square edged coach bolts have a bevel/slopping on the corners of the bolt head that only just let you get a spanner on them let alone a socket set. Seems like a daft design, but maybe I am missing something.
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