... ,DIN 971,ISO 8673,ISO 8675,etcNuts Size Metric or inch, Norminal diameter:M1-M160(1/4 ... 1-1/2”)Custom made products are also welcomed. Nuts Materials1.Stainless Steel: SS201, SS303, SS304, SS316, ... SS410, SS420 2.Steel:C45(K1045), C46(K1046),C203.Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58),4.Bronze ... gold plating and etc as per your need. Nuts Salt spray time2 hours, 24 hours, 48 hours, ...