double end threaded stud with wrench flats

In addition to their strength and durability, galvanized A325 bolts offer several advantages over other types of fasteners
structural
structural bolts a325 galvanized. The zinc coating provides a barrier against rust and corrosion, extending the lifespan of the bolts and reducing the need for frequent maintenance and replacement. This can result in cost savings over time and contribute to the overall longevity and stability of the structure.

...

In addition to material compatibility, the design and installation of aircraft structural fasteners are also critical factors in ensuring the integrity of the aircraft. Fasteners must be properly torqued to the manufacturer's specifications to ensure that they provide the necessary clamping force to hold parts together securely Fasteners must be properly torqued to the manufacturer's specifications to ensure that they provide the necessary clamping force to hold parts together securelyaircraft Fasteners must be properly torqued to the manufacturer's specifications to ensure that they provide the necessary clamping force to hold parts together securely Fasteners must be properly torqued to the manufacturer's specifications to ensure that they provide the necessary clamping force to hold parts together securelyaircraftaircraft structural fasteners. Improperly tightened fasteners can lead to structural failures, in-flight vibrations, and even catastrophic accidents.

...