Tension Control Bolts and the innovative shear wrench system are the lowest cost method of properly installing high strength preloaded bolting assemblies. The standard TCB is recognisable due to the distinctive dome shaped head.

Countersunk head preloaded bolts are available as system HR and HRC (or TCBs) but these should not normally be used, except where a flush finish is essential for functional (not aesthetic) reasons.

Our System HRC structural bolting assemblies are used in a wide range of applications, from bridge splice plates to beam-to-column connections, from stadia roof trusses to rail switches and crossings.

Tension Control Bolts (TCBs) are HRC (High Resistance Calibrated) high strength structural bolting assemblies for preloading and conform to BS EN 14399-1. TCBs provide an easily installed and inspected method of bolting.

AL DATA SHEET 1. Scope and field of application This Technical Data Sheet defines the requirements of high-strength bolt and nut assemblies with calibrated preload, HRC System, …

Type HR (systems HR with or without direct tension indicators, if provided, and HRC) designed to obtain ductility predominantly by plastic elongation of the bolt (minimum nut height ≥ 0,9 D and …

Nov 7, 2018 · Countersunk head preloaded bolts are available as system HR and HRC (or TCBs) and are used where a flush finish is essential for functional reasons. Weathering grade bolting assemblies are not specifically covered in the BS EN 14399 series.

o. 7 Installation of preloaded bolts No. 7.05 Scope This guidance note relates to the use of preloaded System HR bolts to EN 14399-3 (Ref 1) and System H. bolts to EN 14399-10 (Ref 2) in bridge steelwork. The principal uses are in making main girder connections (web-to-web and flange-to-flange) but they are also used in connecting .

HR bolt are preload structural bolts, nuts and washers assemblies for structural steel applications. Both HR bolts BS EN 14399-3 and HV bolts EN 14399-4 are available from our Ningbo Fastenwell's regular production and exporting.

Sep 2, 2021 · Both bolt assemblies require the CE marking and the manufacturer’s trademark. Moreover, the screws and bolts must be stamped with their system designation, HR or HV (H for washers). The HRC system eliminates the doubts related to the application to the correct tightening torque.