Grade 4130 alloy steel rods resist impacts, abrasion, and have a high degree of strength. They are easy to machine and weld and are often manufactured into automotive and aerospace parts and components, fasteners, and structural pieces.

Grade 4140 alloy steel rods contain chromium for improved corrosion and wear resistance properties in addition to molybdenum to resist high temperatures and cracking. These rods have good torsional strength and are easy to weld. They are often manufactured into automotive and aerospace components, shafts, gears, axles, and other parts under continual stress. Grade 4140 is also known as chrome-moly and Chromoly steel.

Grade 4340 alloy steel rods resist fatigue and wear and maintain their shape at elevated temperatures. They are easy to weld and machine and are often manufactured into crankshafts, gear shafts, and other automotive and aircraft parts and components. Additional applications include hydraulic parts and machine tools.

Grade 52100 alloy steel rods contain high amounts of carbon and chromium for added wear resistance, strength, and hardness. They are easy to work and form with machine tools and are often manufactured into bearings, mill rolls, fasteners, blades, and automotive and aircraft parts and components. Grade 52100 alloy steel is also called AISI 52100.