Zinc aluminum flake coating provides excellent protection against corrosion. It is also very helpful in preventing galvanic corrosion. Zinc aluminum flake coating as per ASTM F1136 with different classes applied by SEF will protect high tensile fasteners and parts from hydrogen embrittlement. On modern ers this coating has replaced hot dip galvanizing and electroplating with much better corrosion protection ,lubricity and better surface finish. Coating development on surface will be minimum and so no any modification on threads will be required .This will help to avoid compromising thread strength by over-tapping.This type of coatings are widely used by reputed brands in automotive industries.