The DexRobot DexHand021 Mass Production version is a 19-DOF tendon-driven five-finger dexterous hand weighing 1 kg and measuring 292.6 by 113.2 by 56.5 mm. It features intelligent thermal management with active cooling for continuous 24/7 operation and over 1 million lifespan cycles. Twenty-three integrated sensors provide multi-modal perception including position, temperature, multi-dimensional force, and proximity with 0.1 N sensitivity. The hand ships with the DexTac simulation framework and DexCanvas datasets, along with an open-source ecosystem for end-to-end development from tutorials to deployment. It targets embodied intelligence algorithm validation, industrial automation and high-risk environment operations, education and quick prototyping, and service robot interaction modules.