What is primarily shown on an engineering drawing regarding nut plates?

The correct answer focuses on the critical aspect of an engineering drawing related to nut plates, which is the location of the hole for the threaded fastener. This detail is essential in the assembly process because it ensures that the nut plates are installed correctly within the structure, allowing for proper alignment and secure fastening. The precise positioning of the hole is vital for the integrity and functionality of the assembly, as misalignment could lead to structural issues or failure in the fastening system.

While the dimensions of the nut plates are important, they primarily serve to define their size, not necessarily how they interact with surrounding components. The weight of the assembly and the type of fastener used are less central to the immediate aim of accurately placing and installing the nut plates, making the location of the hole significantly more relevant on the engineering drawing. This focuses on ensuring that the parts fit together as intended according to the design specifications.