A black iron washer is a type of washer made from non-galvanized steel. The term "black iron" refers to the fact that the washer has not been galvanized—the process of coating the steel with a layer of zinc to protect it from rust and corrosion. Black iron washers are more susceptible to rust and corrosion, as compared to galvanized washers, but are also more resistant to wear and abrasion. Typically black, these iron washers have a slightly rough finish, which gives them a distinct appearance.
Black Iron Washer
They are commonly used in plumbing and piping applications, especially for those who want an industrial, rustic look. Black iron washers must not be used in gas lines as they may react to gas and cause flaking.
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