Alloy Steel Round Bar 4140 Annealed Cold Finish, also referred to as Chromoly Steel, is known for strength, resistance to fracturing, abrasion, and impact in high stress applications 4140 is popular for a wide range of applications and is ductile and easily machined in the annealed state It is commonly used for gears, shafts, spindles, fixtures, bolts, valves, sprockets, pistons, and collars in various highstress and heavyduty applications