EN 14399 High Strength Structural Bolting Assemblies For Preload

The EN 14399 standard, which is a European standard, consists of the following subsections under the main heading of "High-strength structural bolting assemblies for preloading":

• EN 14399-1 Part 1: General requirements. This standard describes general requirements for bolt/nut/washer assemblies for preload, high-strength structural bolting. The intended use of bolting assemblies according to this standard is structural metalworking. High strength structural bolting assemblies according to other parts of this standard are designed to meet the requirements of this standard. High-strength structural bolting assemblies are suitable for preloading steel structures according to EN 1090-2. High strength structural bolting assemblies smaller than M12 are not designed to be preloaded. High-strength structural bolting assemblies are not designed to be welded. Railway track fasteners are not covered by this standard.
• EN 14399-2 Part 2: Compliance for preloading. This standard describes the technical requirements for high-strength structural bolting assemblies to ensure preload suitability of bolted connections in metallic structures. This standard includes a conformity test to check the behavior of structural bolting assemblies to ensure that the required preload is reliably achieved with the tightening methods specified in EN 1090-2, with adequate margins against overtightening and failure.
• EN 14399-3 Part 3: System HR - Hex bolt and nut assemblies. This standard, together with the first part, requires preloaded connections with large widths across flat surfaces, thread sizes M12 to M36, and nuts in feature classes 8.8/8 and 10.9/10.sines are explained. Bolt and nut assemblies covered by this standard are designed to allow certain values ​​of preload and to obtain ductility predominantly by plastic elongation of the bolt.
• EN 14399-4 Part 4: System HV - Hex bolt and nut assemblies. This standard, together with the first part, specifies the requirements for preloaded joints with large widths across the face surfaces, high-strength structural bolt and system HV nuts combinations suitable for thread sizes M 12 to M 36 and feature classes 10.9/10. Bolt and nut assemblies covered by this standard are designed to allow preloading and achieve ductility predominantly through plastic deformation.
• EN 14399-5 Part 5: Flat washers. This standard, along with the first and second parts, describes the requirements for large series hexagonal high-strength structural bolts with threads M12 to M36, and for hardened and tempered flat washers intended for bolting assemblies with nuts. Washers conforming to this standard may only be applied under the nut. According to this standard, washers are not designed for use in direct contact with oversized or slotted holes.
• EN 14399-6 Part 6: Flat bevel washers. This standard, together with the first and second parts, describes the requirements for hardened and tempered chamfered flat washers intended for large series hexagonal high-strength structural bolts and bolting assemblies with thread sizes from M12 to M36. According to this standard, washers are not designed for use in direct contact with oversized or slotted holes.
• EN 14399-7 Part 7: System HR - Countersunk bolt and nut assemblies. This standard, together with the first and second parts, describes the requirements for the installation of high-strength structural countersunk bolts and nuts of the HR system, suitable for preloaded connections with thread sizes M12 to M36 and property classes 8.8/8 or 8.8/10 and 10.9/10. . Bolt and nut assemblies covered by this standard are designed to allow preloading and achieve ductility predominantly through plastic deformation.
• EN 14399-8 Part 8: System HV - Hex bolt and nut assemblies. This standard, along with the first and second sections, describes the requirements for preloaded joints with large widths across flat surfaces, high-strength structural bolt and system HV nuts combinations suitable for thread sizes M12 to M36 and feature classes 10.9/10. Bolt and nut assemblies covered by this standard are designed to allow preloading and achieve ductility predominantly through plastic deformation.
• EN 14399-9 Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies. This standard, along with the first and second sections, describes the requirements for direct tension gauges, nut face washers, and bolt face washers as part of high-strength structural bolting assemblies suitable for preloaded connections. The bolt and nut assemblies covered by this standard are designed to allow preloading and to achieve ductility mainly through plastic deformation by plastic elongation of the bolt for the system HR in it.
• EN 14399-10 Part 10: System HRC - Calibrated preload bolt and nut assemblies. In this standard, high strength structural bolts and nuts of the HRC system, suitable for preloaded connections, with hex head (wide widths), cup head or countersunk head, thread sizes M12 to M36 and feature class 10.9/10, together with the first and second sections, are specified in this standard. The requirements for their installation are described. Bolt and nut assemblies covered by this standard are designed to allow preloading and achieve ductility predominantly through plastic deformation.

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