Hardtec screws are 50% harder than 304 Stainless Steel and have greater corrosion resistance than 304 and 410 Stainless. Strength tests show that Hardtec screws have:

• 18% more torsional strength than 410 self drilling screws
• 231% more torsional strength than 305 self drilling screws
• 18% more tensile strength than 410 self drilling screws
• 85% more tensile strength than 305 self drilling screws
• 26% more shear strength than 410 self drilling screws
• 80% more shear strength than 305 self drilling screws

For more information see Hartec Stainless Steel - Technical Information.