These rods are hardened for increased abrasion and impact resistance. Also known as chrome-moly steel, 4140 alloy steel resists fracturing from repeated stress.

Often called ETD-150, this modified alloy steel is drawn at high temperatures for excellent strength and machinability.

A hardened surface makes these hex bars more impact and abrasion resistant than untreated bars. They’re also stress relieved to reduce the chance of warping during machining.

Made from 4130 alloy steel, also known as chrome-moly steel, these tubes have low carbon content for good weldability. They’re often used for building frames and supports, since their flat sides make them easier to bolt than round tubes.