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What does the B mean on US10B?

According to ANSI/BHMA A156.18, “Materials and Finishes,” 2000, the finish referred to as US10B (613) is a category “B.” 

To quote the category listing: “Category B finishes are those that are unstable and are applied to the base material or are the base material defined by the description in 5.2. These finishes shall be compatible with the BHMA match plates, but these finishes cannot and do not match from one alloy or form of material to the next and from one manufacturer to the next.”

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