Scope

The ASTM B695 specification covers the requirements for a coating of zinc mechanically deposited on iron and steel basis metals. The coating is provided in several thicknesses up to and including 107μm. The seven thickest classes are usually referred to as “mechanically galvanized”.

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.

B695 Types

Type

Description

I

As coated, without supplementary treatment

II

With colored chromate conversion treatment