Chains following the enclose image D- 5,5 mm(+/- 0,2) x P-18,5 mm (0,4/-0,2) A- 7,2 mm , B -19,2 mm 1500-2000 meters as first order MATERIAL AISI 304 breaking force 15kN ,core hardness -240 HV .3, surface hardness - 280 HV 0,3