... .25(SPECIFICATION AND HARDNESS OF FORGING BALL)Nominal diameter (mm)DiameteicalTolerance(mm)Weight of single ball in average(g)Number of piece ... 2,CUTING 3,STOVE 4, FORGING 5,TRANSFERMACHINE 6,QUENCHING 7, PACKING 8,HARDNESSTEST 9,DIMENSIONTEST 10,HEATTREATMENT 11,PACKIN(Product performance)