What is the standard finish of Auto-Lok Nut?

Auto-Lok Nut are available in various materials. According to the material grade, the nuts have a standard finish. The standard finishes can be found below Steel Class 8 and Class 10, have as standard finsh a white lanthanum coating. A2 grade nuts are left blank. A4 grade nuts are standard finished with an antigalling Stanal 400, making them look more grey.  
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