The shank also does not contain stress concentrations that could lead to failure, it is therefore important that the shank extends well beyond the interface between parts if a significant shear force will be placed on the bolt.Ī bolt fastening a part to another part with a threaded hole, technically in this application it is acting as a screw.īolts often rely on axial force causing sufficient friction at the threads to remain in place. The unthreaded shank provides an interface with the parts that is more precise and less abrasive. The shaft of the bolt prevents radial movement of the parts, while the head of the bolt and the nut, if fitted, prevents axial movement. The unthreaded part of a bolts shaft is called the shank. Fasteners with their entire shaft threaded are normally called screws. The term bolt is usually used for a fastener which has only part of its shaft threaded. In practice this definition is rarely used. A screw may cut its own threads or mate with a threaded part. A screw may first pass through a first part with a clearance hole but its threads mate with threads in one of the parts being fastened. A bolt is inserted through parts which all have unthreaded holes and a nut is then screwed onto the bolt to provide a clamping force and prevent axial movement. These types of fasteners are typically inserted through two parts, with aligned holes.Īccording to some definitions, whether something is a bolt or a screw depends on how it is used. Bolts are closely related to screws, which are also mechanical fasteners with threaded shafts. A nut and bolt clamping two parts together.Ī bolt is a mechanical fastener with a threaded shaft.
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