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This precision-ground tool steel rectangle bar is ideal for high-performance applications in industries such as aerospace, automotive, and manufacturing. Made from O1 tool steel, it offers exceptional hardness and durability, with a Brinell hardness of 177 BHN and a Rockwell hardness of 88 HRB. Its yield strength of 58,000 psi and tensile strength of 105,000 psi ensure reliable performance under heavy loads. Use it for making precision tools, dies, and molds, or for other applications where high hardness and resistance to wear are required. Its precision ground finish and oil-hardened treatment provide a smooth and durable surface.