Carriage bolt (coach bolt): Has a domed or countersunk head, and the shank is topped by a short square section under the head.The square section grips into ...是什么意思_Carriage bolt (coach bolt): Has a domed or countersunk head, and the shank is topped by a short square section under the head.The square section grips into ...在线翻译_英语_读音_用法_例句