Metal lathing materials may vary from specified weights in accordance with customary mill tolerances established by which organization?

Metal lathing materials may vary from specified weights in accordance with customary mill tolerances established by which organization?

• A. AISI
• B. ASTM
• C. ISO
• D. DIN

Answer: (A)

When metal lath is manufactured, there’s a small range of variation in weight per area due to mill tolerances. For steel products used in the United States, those customary mill tolerances are set by the American Iron and Steel Institute. This provides a uniform allowance for slight differences from the nominal weight, which helps contractors predict material usage and plaster behavior. While standards bodies like ASTM set the specifications the product must meet, the actual allowable deviation in weight is defined by AISI. International bodies would handle different contexts, but in this context, AISI is the reference for mill tolerances.

When metal lath is manufactured, there’s a small range of variation in weight per area due to mill tolerances. For steel products used in the United States, those customary mill tolerances are set by the American Iron and Steel Institute. This provides a uniform allowance for slight differences from the nominal weight, which helps contractors predict material usage and plaster behavior. While standards bodies like ASTM set the specifications the product must meet, the actual allowable deviation in weight is defined by AISI. International bodies would handle different contexts, but in this context, AISI is the reference for mill tolerances.