Flat key pins are precision-engineered fasteners widely used in MRO and automation industries for aligning and securing components in machinery and equipment. These pins feature a flat surface or keyway that prevents rotation, ensuring stable and accurate positioning. Common types include dowel pins, parallel pins, and tapered pins, available in various materials like steel, stainless steel, and alloy. Applications include jig and fixture alignment, automotive assemblies, and robotic systems. Key specifications include diameter, length, tolerance, and hardness. Flat key pins are essential for maintaining mechanical integrity and reducing wear in high-precision environments.