Hot Rods Crank Pin - 21 x 40 x 74

This is the Hot Rods Crank Pin, measuring 21mm x 40mm x 74mm. It's crafted from hot-rolled ASTM 4115 steel, a strong material chosen for its durability in engine components. After forming, it's case-hardened to a hardness of 58-62 on the Rockwell C scale, which significantly increases the surface toughness and resistance to wear. This process is crucial for parts like crankshaft pins that endure high stress and friction during engine operation.

The case-hardening process creates a hard outer layer while keeping the core material slightly more ductile, helping to prevent brittle fracture under load. This combination of strong base material and a tough, wear-resistant surface makes this crank pin a reliable choice for engine builds where performance and longevity are important.