4340 3.5" x 1.375" RD Top Tool / Hardy Blank 168 Manufacturing Due to its forgiving nature

Due to its forgiving nature

The high flexibility backing holds up to the toughest applications and will conform to even the tightest curves with minimal grit shedding

Chromium: 0

4340 is a medium carbon alloy steel similar to 4140 but with the addition of a higher nickel content which gives it extra toughness

and shock resistance

4340 3.5" x 1.375" RD Top Tool / Hardy Blank 168 Manufacturing Due to its forgiving nature4340 is a medium carbon alloy steel similar to 4140 but with the addition of a higher nickel content which gives it extra toughness, especially at slightly higher temperatures. It is suitable for making most blacksmiths told such as hammers, punches, top and bottom tools, dies, etc. It is oil hardening but displayed some slight air hardening properties so caution should be exercised to ensure struck ends of tools are soft. Element: Content % Iron: 95.