HR Bolt | Preload Bolts | Structural Bolt BS EN 14399 Manufacturer
What is a HR bolt?
HR Bolt are high resistance preload structural bolts assembled with nuts and washers, usually HR bolt are grade 10.9 and hot dip galvanized and available with two types, one is BS EN 14399 3 bolt and another is EN 14399 4 bolt. Both types of HR bolts are availalble in our regular production and exporting business.
What does HR mean on a bolt?
HR bolts meaning that high resistance bolts assemblies, and there are also high resistance calibrated bolts assemblies(HRC bolt), as well as HV bolts assemblies from German standard, which have a short bolt thread and use a thinner nut to obtain ductility by plastic deformation of the threads within the nut. Both preload bolts HR and HV bolt are grade 10.9, hot dip galvanized.
What is the difference between HR bolt and HV bolt?
When compare HR bolt with HV bolt, the first difference is that they are for different standard from different country. HR bolt is a french bolt standard EN 14399 3 and HR is the abbreviation of high resistance.
While HV bolt is a German bolt EN 14399 4 and HV is the short of Hochfest Vorgespannt. Another main difference should be their breakage in case of stress. HV bolts EN 14399-4 use a lower nut so that they will be the first to break when under tensile strength. The internal thread will tear only afterwards, while HR bolts EN 14399-3 use a higher bolt and longer thread lengths than HV Bolt EN 14399-4.
Both HR bolts and HV bolts are mostly used in predominantly dynamic steel constructions.
What are the main applications for HR bolt?
HR bolt are preload bolts, which compared with non preloaded bolts, are assemblies of structural bolts, nuts and washers for structural steel applications. For examples, high resistance bolts (HR Bolt) are used in the construction of bridges, buildings, stadiums and other large structures that require high strength and durability.
Preload HR bolts with high resistance properties, which make them perfect fasteners solution to secure the entire structure of wind turbines that are exposed to harsh weather conditions. With the development of wind energy, we receive more and more HR bolts request from contractors and wholesalers in worldwide market.
High resistance bolts also play an important role in the construction of power plants and for securing large equipment and machinery. Meanwhile, HR bolts are widely used in the automotive industry for applications such as engine assembly, wheels and suspension components.
If you are looking for HR bolts BS EN 14399, grade 10.9 and hot dip galvanized, please feel free to contact our export engineers at info@fastenwell.cn. We look forward to talk with you and provide most reliable solutions for your clients and projects.
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