The Brinell Hardness of Tool Steel constant displays the value of the Brinell hardness for A2 tool steel (630 BHN).
Brinell hardness test determines the ability of a metal to resist permanent indentation deformation through the scale of penetration of an indenter that is loaded onto a material sample. Brinell hardness is one of several definitions of hardness for materials science.
The Brinell hardness of A2 tool steel is 630 Brinell hardness numbers (BHN).
Material Properties (https://material-properties.org/tool-steel-density-strength-hardness-melting-point/)