(Balls Diameter)  No. of balls per kg   (Balls Diameter) No. of balls per kg MM Weight (kg) MM Weight (kg) 　 1960784 　 478 0.68 0.00128 8.5 2.5 　 478469 11/12 369 1 0.00408 9 2.97 　 141844 3/8 284 1.3 0.00893 10 4.08 　 80645 13/32 223 1.588 0.016 11 5.42 　 45872 7/16 179 2 0.0326 11.5 6.22 3/32 18182 29/64 161 2.5 0.0637 11.9062 6.88 　 9091 　 142 3.175 0.131 12.3031 7.6 　 5714 1/2 120 3.9688 0.255 13.4938 10 　 3831 　 89 4.7625 0.441 14.2875 11.9 　 1961 19/32 71 5.1594 0.56 15.875 16.3 7/32 1431 　 60 5.9531 0.86 16.6682 18.9 　 1135 　 50 6.35 1.04 17.4625 21.7 　 894 23/32 40 6.7469 1.25 19 27.96 9/32 671 3/4 35 7.9375 2.04 19.8438 31.9 (Size) G10 G50 G200 G1000 　 AISI1015-AISI1085; AISI52100, GCR15, 100CR6 Etc (Standard)