Herculock’s signature repair method, often called metal locking or metal stitching, is a precision cold process. It mechanically bonds fractured cast iron without introducing heat. That means no warping, no shrinkage, and no thermal stress.

The process involves cutting out irreparable sections, drilling and connecting precision slots along the break, inserting custom locking elements, and lacing the repair with tensioned bolts to restore structural integrity. Surfaces are then blended or machined as required, followed by inspection using dye penetrant or magnetic particle testing.

This process remains the preferred solution when a component cannot be welded, when downtime is critical, or when OEM replacements are weeks or months away.