A bolt is a mechanical fastener characterized by a threaded shaft. Typically, bolts are inserted through unthreaded holes in components, and a nut is screwed onto the threaded end to create a clamping force. This clamping force helps secure multiple parts together, preventing axial movement and contributing to the formation of a bolted joint.
Bolts come in various types, shapes, and sizes, and they are widely used in construction, machinery, and various other applications to join and fasten components securely.
The design of a bolt includes a head, often hexagonal, and a shaft with external threading. The specific type and characteristics of bolts can vary based on their intended use and the materials involved.
A bolt is a mechanical Fastener characterised by a threaded shaft.
Hex Bolt
Hex Bolts and Nuts are the most common types of bolts. These bolts feature a flat hexagonal shaped head that are used with hex nuts and washers to fasten metal components. Union fasteners offer Imperial (INCH) and metric measurements.
FLANGE/ PURLIN BOLT
Flange Bolts and Nuts are designed to provide a connection between steel flange, commonly used in the construction of steel-framed buildings. Both the bolts and nuts are typically flanged, eliminating the need for washers, while the serrations under the flange help to bite into the materials being fixed.
Union fasteners offer Serrated and non serrated Flange Bolts in metric measurements.
Structural Assemblies
HSFG Bolts are structural bolts that are tightened to create specific tension in the bolt. This tension prevents the steel members in a joint from moving relative to each other because of the frictional resistance.
Designed to be used in heavy-duty engineering applications, HSFG (High Strength Friction Grip) Bolts are made from Class 5.6, 8.8 or 10.9 high tensile and “structural grade” steels which boast superior tensile strength, fatigue, and corrosion resistance. For this reason, HSFG Bolts will often be found in structures like bridges, where strength, vibration resistance and shock resistance are essential. Batch tracked items with full traceability and test certificates available.
Carriage/ Coach Bolt
Coach bolts slso known as carriage bolts, Coach Bolts feature a rounded head and a square neck that prevents the bolt from turning when tightened. Designed to be used with nuts, these bolts are ideal for applications where a flush finish is required on one side of the assembly. Commonly used in outdoor timber structures such as pergolas and fence posts.
