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Norm Abram replies: The 5/8-inch, fire-code drywall (called Type X) increases a wall's fire rating to a minimum of 1 hour, from the 30-minute rating for standard Â½-inch drywall. And it's not just thickness that makes the difference. Type X has a denser core and contains glass fibers that keep it from crumbling in the heat.
USS pattern is the most common type of flat washer. 1  Zinc plated steel A low carbon steel for general use. Zinc plated for moderate corrosion resistance. 2  Zinc plated grade 5 steel A tempered medium carbon steel. Grade 5 falls between grade 2 and grade 8 in strength, and is commonly found in automotive applications.