Sechskant

Sechskant is a German term that denotes a hexagonal shape with six equal sides. In engineering and construction, Sechskant is commonly used to refer to fasteners and components that have an external hexagonal profile designed to be driven with a wrench or socket. The most familiar examples are hex bolts and hex nuts, which are sized by their diameter and thread pitch and by the distance across the flats of the hex head or nut.

Hex fasteners are valued for their ability to transmit high torque, their ease of manufacturing, and their compatibility with standard hand and power tools. The hexagonal geometry provides a reliable grip in confined spaces and allows multiple wrench sizes to engage the fastener. In practice, terms such as Sechskantbolzen (hexagonal-headed bolt), Sechskantschraube (hex bolt), and Sechskantmuttern (hex nut) are used to describe the main variants. Related drives include Innensechskant (internal hex, Allen drive) and Außensechskant (external hex).

Standards and dimensions for Sechskant fasteners are defined internationally, primarily under ISO metric and DIN specifications. Hex bolts and nuts are specified by diameter, thread pitch, length, and the size across flats of the hex profile. The hex form is standardized to ensure interchangeability across manufacturers and applications, from light assemblies to heavy machinery. Materials commonly used include carbon steel, stainless steel, and various alloy steels, with finishes such as zinc plating or galvanizing to improve resistance to corrosion.

In use, Sechskant fasteners appear throughout mechanical engineering, automotive, construction, and consumer products, where reliable clamping and straightforward installation are required. The term highlights the geometric simplicity and practical utility of six-sided drive systems.