TimberMate Cup Sq Hex M8x60 SS DIN603 Bx 100A cup square bolt (or carriage bolt) is a specialized fastener featuring a rounded dome head and a square neck directly beneath it. The square neck locks into the material during installation, preventing rotation while the nut is tightened.
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• A cup square bolt (or carriage bolt) is a specialized fastener featuring a rounded dome head and a square neck directly beneath it. The square neck locks into the material during installation, preventing rotation while the nut is tightened.