The process of checking whether it complies with DONGAH’s quality regulations upon arrival at the factory in a hot-rolled state.

To secure forgeability, material scale shot blasting & drawing work for equalizing the diameter of the wire rod

The process of shaping a product through forging.

A process of forming a screw shape that satisfies the fastening conditions through a rolling process.

This is the process of securing the mechanical properties of the product, and is managed by the strict quality system of the Dong-A Changwon Bolt Factory.

Process of checking defects (cracks, incorrect items, poor shape) that occur during the process with an automated inspection device.

Process that assemble the regulated quantity by automated equipment that mix high-tensile bolt, nut and washer together.

Round steel rods, the raw material for nuts, are stored and managed according to first-in, first-out and storage regulations.

A process of forging after heating to approximately 1,200℃ to mold the product into a specified shape.

Process that remove the surface scale after forging.

For fastening conditions of the nut, threads are formed internally by cutting.

This is the process of securing the mechanical properties of the product, and is managed by the strict quality system of the Dong-A Changwon Bolt Factory.

Process of checking defects (cracks, incorrect items, poor shape) that occur during the process with an automated inspection device.

Process that assemble the regulated quantity by automated equipment that mix high-tensile bolt, nut and washer together.