M4 M5 M6 Grade 12.9 High Strength Hex Socket Cap Screws Half Thread Black Oxide for Machinery & Equipment

These grade 12.9 high-strength hex socket cap screws are specially designed for heavy-duty machinery, industrial equipment, mechanical assembly, and engineering applications. Made from alloy steel with a black oxide finish, they provide exceptional hardness, tensile strength, and wear resistance, meeting strict industrial standards.

 

Featuring a half-thread design, these cylindrical head bolts offer stable clamping force and are easier to insert into mounting holes, making installation more efficient. The internal hex socket drive ensures reliable torque with no slippage, suitable for high-pressure working environments.

 

With excellent toughness and fatigue resistance, these black cup head screws are widely used in automation equipment, molds, automotive parts, machine tools, and precision machinery. Available in M4, M5, and M6, they fit most industrial fastening requirements.

 

Ideal for factory production, maintenance, mechanical engineering, and professional use, these grade 12.9 half-thread screws deliver superior performance for heavy-duty, long-lasting fastening.