Filter by
Material
System of Measurement
Yield Strength
Fabrication
Heat Treatment
Specifications Met
Hardness Rating
Maximum Hardness After Heat Treatment
Hardness
Appearance
Heat Treatable
DFARS Specialty Metals
Export Control Classification Number (ECCN)
Maximum Yield Strength @ Maximum Hardness
REACH
RoHS
Maximum Temperature
Elongation
About Carbon Steel, Alloy Steel, Spring Steel, and Cast Iron
More
High-Strength Ultra-Fatigue-Resistant 300M Alloy Steel
- Yield Strength: 100,000 psi
- Hardness: Rockwell C25 (Hard)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Rockwell C54
- Fabrication: Hot Rolled
- Specifications Met: ASTM A579
A modified version of 4340 alloy steel, this 300M alloy steel combines high yield strength with extreme resistance to cracking. It’s often used to create parts that require both, such as torsion bars and drive shafts. This alloy steel has been heat treated to relieve internal stresses, making it easier to machine. Additional heat treatment can be applied to harden the surface and make it more wear resistant. This alloy steel meets strict ASTM A579 standards for manufacturing and performance.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.