Manufacture Process

Screw Manufacturing Process

Producing high-quality screws involves a series of precision-controlled steps to ensure consistent performance, strength, and durability. At our facilities, we follow a strict manufacturing process that meets industry standards and customer expectations for structural fasteners.

1. Wire Preparation

The process begins with selecting the appropriate raw material—usually carbon steel or stainless steel wire—based on the desired mechanical properties and corrosion resistance. The wire is cleaned, straightened, and cut to specific lengths for forming.

2. Cold Heading (Forming the Head)

Cold heading forms the screw head by pressing the wire under high pressure without heating. This ensures a strong, compact grain structure. Head styles such as hex, pan, or countersunk are created at this stage, along with optional recess types like Phillips or Torx.

3. Thread Rolling

Threads are formed using dies that roll the material rather than cutting it, which improves tensile strength by preserving the metal's grain flow. The screw’s point type—self-drilling, self-tapping, Type 17, etc.—is also shaped during this phase.

4. Heat Treatment

For carbon steel and 410 stainless steel screws, heat treatment is applied to increase hardness and mechanical strength. This process includes quenching and tempering to achieve the required balance of strength and ductility, especially critical for drill points and concrete anchors.

5. Surface Coating / Plating

Screws are coated to enhance corrosion resistance and improve appearance. Common coatings include zinc plating, ruspert, black phosphate, or organic finishes. Stainless steel screws may go through passivation instead of coating.

6. Quality Control & Inspection

Every production batch undergoes strict quality inspections, including dimensional checks, hardness testing, thread accuracy, drilling/tapping performance, and corrosion resistance verification. This ensures our screws meet international standards and customer-specific requirements.