Expandable anchors, often known as expansion anchors, are fasteners designed to secure objects to solid materials such as concrete, brick, or stone. The fundamental principle behind their design is the ability to expand under pressure, thereby creating a secure grip within the base material. When installed, the anchor's body expands outward, locking itself firmly in place, making it suitable for heavy loads and dynamic forces.

Hex head bolts are characterized by their hexagonal (six-sided) heads, which allow for easy tightening and loosening using a wrench or a socket. This design feature is one of the key reasons for their widespread use in various industries. The hexagonal shape provides a firm grip, enabling the application of greater torque without slipping, thereby enhancing the bolt's effectiveness in maintaining structural integrity.

While not fasteners in the traditional sense, washers are often used in conjunction with bolts, nuts, and screws to improve their performance. Washers distribute the load of the fastener over a larger surface area, helping to prevent damage to the material being fastened and reducing the risk of loosening due to vibration. There are several types of washers, including flat washers, lock washers, and fender washers, each serving specific functions in various applications.