Jergens Standard Tooling Balls/test Ball/checking Ball Buy Tooling .
Jergens standard tooling balls/test ball/checking ball. 1, Introduction. Tooling ball is a positioning, looking for the spherical tool, the material is 440C stainless steel, quenching treatment to 58~60HRC, the ball to axis eccentricity tolerance of not more than 0.005mm. 2, Application. Automobile mold Processing Inspection.