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B695 Coating Classifications

Class Minimum Thickness, μm
110 107
80 81
70 69
65 66
55 53
50 50
40 40
25 25
12 12
8 8
5 5
Class 55 is the most common class used for ASTM fasteners and is roughly the same thickness as hot dip galvanizing per ASTM F2329. 53μm is equivalent to 0.002087 inches or 2.087 mils.
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