Screws are the primary fasteners in mechanical equipment, and hex keys (Allen wrenches) are essential tools for processing, production, and maintenance in the machinery industry. This project represents a revolution in traditional wrench tools. Based on the different materials of hex keys, corresponding surface treatment requirements are proposed.

1.Bright Chromium: As shiny as a mirror.

2.Satin Chromium: Matte finish.

3.Electrophoresis: Black with a certain degree of brightness. It involves applying an external direct current to cause charged particles to move directionally in a dispersed medium towards the cathode or anode, promoting the separation of substances.

4.Phosphating: Black but with a dull shine. It involves immersing the material in a phosphating solution, where a layer of insoluble crystalline phosphorus deposits on the surface, a process involving the conversion of hydrochloric acid.

5.Gray Nickel: A brand-new surface treatment method with strong rust prevention capabilities, which increases the service life of the product.

6.Other treatments include blackening, nickel-iron alloy, pearl nickel, black nickel, and titanium plating.