Which markings are used to identify AN-type aircraft bolts?

AN-type aircraft bolts are specifically identified by code markings on the bolt heads. These markings consist of alphanumeric characters that provide essential information about the bolt, such as its material, size, and strength class. This coding is standardized for AN bolts, ensuring that mechanics can quickly recognize the type and specifications of the bolt they are working with, thereby maintaining safety and adherence to aviation standards.

The presence of these code markings allows for efficient identification and verification of bolts, which is critical in aviation applications where structural integrity and reliability are paramount. This standardization helps prevent accidents that may arise from using incorrect or substandard fasteners.