Tool Steel H13 Rectangular Bar 4" x 3/8" Retail Price

About H13|Hot work tool steel (5% chromium, 1.35% molybdenum, 1% vanadium). The standard for die-casting dies, extrusion tooling, and hot forging dies. Maintains hardness and toughness at elevated temperatures (up to 1000°F+). Typically used at HRC 44-52. Machines well in the annealed condition with carbide. In the pre-hardened condition, use coated carbide at reduced speeds. Used for aluminum die-casting dies, extrusion mandrels, hot shear blades, and forging dies. Compare to S7 (better impact resistance, lower hot hardness) and A2 (cold work, not for elevated temperatures).

About Rectangular Bar|Solid rectangular cross-section stock. Functionally similar to flat bar but typically available in thicker, chunkier profiles. The naming varies by supplier — what one calls rectangular bar, another calls flat bar. Used for keys, gibs, wear strips, brackets, and any part where a rectangular starting profile saves setup time versus milling from plate.