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Assembly troubles with positioning pins are largely due to the geometry of the ends. Choosing the appropriate chamfer (C face) or radius (R face) can make a significant difference in assembly efficiency and component lifespan. C face (Chamfer): Excellent for guiding initial contact and correcting position, it allows for smooth guidance. It reduces seizing and deformation, and minimizes positional misalignment during press-fitting. It pairs well with ANSI standard hardened steel, making it ideal for high-precision press fits and improving stability in automated lines. R face (Radius): The curved surface disperses stress, reducing the risk of damage to hole walls and fatigue cracks. It is suitable for ISO/DIN standard non-hardened stainless steel, and is ideal for slip fits, frequent assembly and disassembly, and use with soft materials like aluminum and plastics. It ensures durability and stability even with long-term use. Selection summary: For efficiency, choose C face; for durability, choose R face; for critical structural components or high-precision equipment, a combined design of C + R is appropriate.