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This article provides an engineering-focused comparison between 316L Stainless Steel and Titanium for micro-diameter medical locking pins. It highlights why 316L is the default choice for achieving ±0.01mm tolerance stability in batch production, while Titanium remains the superior option for permanent, biocompatible implantation. It serves as a decision-making framework for procurement managers and medical device designers to balance cost, performance, and clinical safety.