... steel and are installed in stainless steel sheet.Threaded size for steel nuts are : M2,M2.5,M2.6,M3,M4,M5 ... M8,M10,M12,M16,M20; Surface treatment for steel nuts are : cementite ,plating Thread size for stainless steel are:M2.6,M3,M4 ... ,M5,M6,M8Thread size for brass nuts are: M3,M4,M5.Characters:1.The Kalei nut ... obtained.4.Still can be used after surface treatment. Incline Knurled Nuts