What type of hole do all nut plates possess?

Nut plates universally feature a threaded hole to accommodate screws or bolts. This design is essential for secure fastening in aerospace applications, ensuring that components are reliably linked together under various operational conditions. The threaded hole allows for a strong mechanical grip when a fastener is inserted, enabling components to withstand the stresses and vibrations typical in aerospace environments.

While other options like a plain hole or countersunk hole may be used for specific purposes or in different contexts, they do not provide the necessary functionality that the threaded hole offers in a nut plate. A recessed hole, on the other hand, serves a different purpose for space-saving or aesthetic considerations and is not a standard feature of nut plates. Thus, the presence of a threaded hole is a defining characteristic that supports the primary function of nut plates in assembly processes.