709M40 Alloy Steel – Complete Guide, Properties, and Applications

709M40 Alloy Steel gives you the strength, toughness, and reliability you need for demanding applications. Known internationally as EN19, 42CrMo4, and 4140, this engineering grade has a proven track record in industries that can’t compromise on performance. With its balance of strength, ductility, and machinability, you’ll see it used in shafts, gears, high-tensile bolts, and automotive parts.

At Nifty Alloys, we supply 709M40 round bars, plates, and forgings that meet strict international standards. Every batch is tested, traceable, and certified, so you know exactly what you’re working with. Our experience ensures you get material that’s ready for your critical applications without delays or doubts.

Key Features of 709M40 Alloy Steel

• High tensile strength – ideal for demanding applications.
• Excellent toughness and shock resistance.
• Good machinability in both annealed and heat-treated states.
• Suitable for heat treatment (quenching and tempering).
• Wide availability in bars, plates, and custom-cut sizes.