To limit the probability that the performance and physical properties of steel screws, with respect to withdrawal resistance, pull-through resistance or shear strength, will fall significantly below expectations, which could lead to an inability to resist expected lateral and gravity loads.
For assemblies that are required to provide fire resistance, this is to limit the probability of excessive movement, deformation or failure under expected loads, which could lead to compromised fire resistance of the assemblies, which could lead to harm to persons.