zeskantbout

A zeskantbout, known in English as a hex bolt or hex cap bolt, is a fastener with a hexagonal head designed to be driven with a wrench or socket. It is used to clamp two or more parts together, typically with a nut or in a tapped hole, and relies on a threaded shank to apply clamping force.

Most hex bolts come in two main variants: fully threaded and partially threaded. The overall length is specified to describe the bolt’s total length, while the threaded portion may extend along the full length or only part of it. Hex bolts are produced in metric and imperial sizes and are standardized under various international and national standards, including ISO and DIN, to define dimensions, tolerances, and mechanical properties.

Materials and finishes vary by application. Common choices include carbon steel, stainless steel, and alloy steels, with protective finishes such as zinc plating, galvanizing, black oxide, or passivation for corrosion resistance. Strength is indicated by metric property classes (for example 8.8 and 10.9) or by imperial grades (such as Grade 5 or Grade 8), reflecting yield and tensile strength.

Applications and usage considerations: hex bolts are widely used in machinery, automotive, construction, and furniture assembly. Correct selection depends on load requirements, thread engagement, and environmental conditions. Proper torque, compatible with thread pitch and material grade, is essential to achieve the desired clamping force and to avoid over-tightening or loosening under vibration.