What type of bolts are used to fasten door hangers to the doors?

The appropriate type of bolts used to fasten door hangers to the doors is hex bolts. Hex bolts are specifically designed for structural applications and provide a strong connection. Their six-sided head allows for a secure grip with a wrench, facilitating greater torque and making it easier to achieve the proper tightness. This is crucial in maintaining the stability and security of the door mechanisms, which must withstand frequent use and varying loads.

Using other types of bolts such as pendant, wood, or anchor bolts may not offer the same level of strength or compatibility with the door hangers. Pendant bolts are not typically used in this context, as they are designed for different applications. Wood bolts would not be suitable for metal or heavy-duty doors, while anchor bolts are intended for securing fixtures to solid surfaces like concrete rather than for fastening moving components like door hangers. Therefore, hex bolts stand out as the best option for ensuring reliable and durable installation of door hangers.