M12 Coach bolt & cup square bolts
The M12 Coach Bolt has a thread diameter of 12 millimetres, in simple terms the M stands for millimetres followed by the size – in this case 12 mm. Our M12 coach bolts can also be referred to as a M12 carriage bolts and sometimes M12 cup square bolt. Coach bolts have a domed top with a square under the head to prevent turning when tightened making them great for creating strong secure joints between timber and metal.
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