What is the standard lead content in a brass fitting?

Brass fittings traditionally have varying levels of lead content, which affects their strength, machinability, and corrosion resistance. The correct answer indicates that the standard lead content in a brass fitting is 5%. This level is significant because it balances the desirable characteristics that lead imparts to brass, such as improved workability and reduced friction during use, while also considering health and safety regulations, particularly concerning drinking water applications.

In many jurisdictions, guidelines and regulations exist to minimize lead exposure, especially in plumbing fixtures, leading manufacturers to often adhere to or strive for lower lead contents in their brass products. As for the other options, while brass can contain up to 10% or even higher lead content in some specific applications, the standard for general use in fittings has moved towards the 5% mark to promote better safety practices. Hence, although higher percentages do exist in certain contexts, the most accepted standard for fittings in many industries is indeed 5%.