crossbars

Crossbars are horizontal structural members that span between supports and join together to form a framework. They are designed to resist bending, shear, and torsional stresses and to provide mounting points for other components. The specific shape and material depend on the application, but crossbars generally function to distribute loads and maintain spacing within a structure.

In vehicles, roof rack crossbars provide a stable platform for carrying equipment. They typically run across the width of the roof, perpendicular to the longitudinal rails, and are mounted to the vehicle body or to track systems. Common materials are aluminum alloys for lightness and corrosion resistance, or steel for strength. Modern crossbars may be aerodynamically shaped to reduce wind noise, and many incorporate locking mechanisms and load ratings set by the manufacturer. Correct installation and adherence to vehicle load limits are essential to prevent damage or handling issues.

In architecture, crossbars appear as crossbeams or structural members in trusses, frames, and bracing systems. They help transfer loads, stabilize against lateral forces, and provide attachment points for cladding or other elements. In scaffolding and timber framing, crossbars connect uprights and help distribute weight along a structure.

In furniture and equipment design, crossbars provide support between frames, for example in beds, chairs, and certain shelving systems, helping to distribute weight and maintain shape.

Materials range from wood and steel to aluminum and composites. Designers consider span, stiffness, connection details, corrosion resistance, and maintenance. See also bracing, truss, roof rack.