12 January 2022
12 January 2022
We understand the difficulties by the end-users and purchasing departments in choosing the right components for different installation methods of High-strength structural bolting assemblies for preloading (HR).
Different installation methods and product grades may require additional components like DTI washers, hardened washers, bolt face or nut face washers. Sometimes, the number and type of component change, depending on which part is rotated (the nut or the bolt head).
We have prepared the HR configurator below to simplify this task.
about BS EN 14399 (HR) Configurator
02 March 2021
When ordering Preloaded Assemblies (EN 14399-1) to be installed with Direct Tension Indicator Washers (DTI’s) , there are 4 different methods of how they can be installed. Depending on the access or preference, you may choose one method, over another.
At the purchase stage, we may not know how you will be installing your assemblies. Please read below, as you may require an additional washer(s) to be purchased.
about Do I need Bolt Face Washer or Nut Face Washer (EN 14399-9) with DTI's?
26 January 2021
02 February 2018
Following certification renewal audit carried out by Lloyd’s Register Quality Assurance (LRQA) on 31st January 2018 and 1st February 2018, Andrews Fasteners Limited has been found to comply with the requirements and been recommended for the renewal of its certificates for ISO 9001:2015, National Highway Sector Scheme 3 (NHSS 3) and Construction Product Regulations approvals (EN 15048-1:2007 and EN 14399-1:2015).
Our final certificates, once issued will be published on our Certificates and Approvals section.
about Andrews Fasteners Limited - Certificate Renewal (2018)
11 July 2017
Preloaded assemblies with specified k-Class shall be tightened using below methods
(See BS EN 1090-2:2008+A1:2011, Table 20 for more details).
Method k-Class Torque method K2 Combined method (torque / part-turn) K2 or K1 Direct Tension Indicators (DTI) K2, K1 or K0 k-Class K2 using Torque Method Torque method uses a torque wrench in two steps of assembling.
about Torque values for preload bolt assemblies with specified k-Class
03 July 2017
Andrews Fasteners Limited, following recent transitional process with Lloyd’s Register Quality Assurance (LRQA) gained approval to the latest version of EN 14399-1:2015.
We are proud to be the first company in the United Kingdom to become approved to the latest edition of the standard and one of the first companies in the world.
Following new approvals, new assemblies for preloading will be associated with a new type of CE Labels and a new layout of Declaration of Performances following the strict requirements of the new standard.
about Andrews Fasteners Limited – The first fastener company to be approved to EN 14399-1:2015
29 January 2016
12 January 2016
The minimum thread length is calculated strictly according to EN 14399-3 for preload bolts - System HR and EN 14399-7 for preload countersunk head bolts - System HR.
In calculation, you need to consider standard reference thread length (b), minimum length of the shank - un-threaded part of the bolt, and distance from the head of the bolt till first full thread.
To help with that, we have created two useful calculators:
about What is the minimum thread length on preload bolts?
18 December 2015