Automotive key blades are essential components of car keys, providing mechanical security and precise operation within locks. Their manufacturing process combines material selection, precision machining, and quality control to ensure durability and compatibility.

Material Selection and Preparation

The production begins with choosing high-quality metals, commonly brass, nickel-silver, or stainless steel. These materials are selected for strength, corrosion resistance, and wear durability. Raw metal rods or sheets are cut into blanks that will later be shaped into key blades. Proper material choice ensures the key blade can withstand repeated insertion and rotation in locks without deforming.

Cutting and Shaping

The next step involves precise cutting and shaping of the key blank. CNC machines or stamping processes are used to form the specific profile and grooves that correspond to the vehicle’s locking mechanism. For certain keys, milling or laser cutting may be applied to achieve high precision. This stage determines the mechanical compatibility of the key with its lock cylinder.

Finishing Processes

After cutting, the key blades undergo surface finishing, including polishing, deburring, and sometimes coating. Polishing removes sharp edges and burrs, ensuring smooth insertion and operation. Some key blades receive a protective plating or coating, such as nickel or chrome, to enhance corrosion resistance and improve appearance.

Quality Control and Inspection

Each key blade undergoes strict quality checks. Dimensions, groove accuracy, and surface quality are verified to ensure proper function and long-term durability. Random testing may be conducted to confirm performance under repeated use. Once approved, the key blades are packaged and sent for assembly with key heads or electronic components.

https://www.hc-key.com/product/smart-key-blade/
Abridged edition For Benz (Dual battery holder) A-Class B-Class C-Class E-Class S-Class Smart Key Blade
Applicable models：    Benz (Dual battery holder) A-Class B-Class C-Class E-Class S-Class
Product material:    Brass-electroplated
Product specification:     /
Product unit weight:    7.4 g
Product advantages:     Easy cutting, easy processing.