Content with FAQ

03 May 2022
The clamp length is the distance between the bolt head and the nut holding all the components together. It includes steelwork, any shims, plates and washers used. The grip length is the thickness of the steelwork (thats includes plates, shims etc.) that can be gripped together by the bolt and nut assembly. It strictly depends on the specific application (how many washers are used in the assembly). Example For EN 14399-3 hexagon bolt assembly type HR , diameter M30 and 100mm in length, the reference clamp length will be between 48mm up to 69mm, whereas the grip length with one washer will be 44-63mm and two washers 40-57mm.
Read more about What is the difference between Clamp length and Grip length in EN 14399 assemblies?

04 February 2022
Apart from dimensional differences ( bigger head of the bolts and bigger nuts on preloaded assemblies), the main difference is in the way how these goods are installed. Non-preloaded bolting assemblies are generally tightened to at least snug-tight. The connected components are drawn together to achieve firm contact without any specific preload. The “snug-tight” is generally referenced as tightening the assembly by one man using a normal-sized spanner without an extension arm until the wrench starts hammering.
Read more about What is the difference between preloaded and non-preloaded bolting assemblies?

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. Figure 1 Figure 2 Figure 3 Figure 4 Installation methods: Installing DTI under the bolt head when the nut is rotated (Figure 1)
Read more about Do I need Bolt Face Washer or Nut Face Washer (EN 14399-9) with DTI's?

01 September 2017
Customers very often ask for torque figures for the installation of non-preloaded bolt assemblies . Due to the nature of this type of product, assemblies for non-preload connections, there are no torque figures available. There are various guidances available to calculate theoretical torque figures, but following EN 1090-2 (pt. 8.3), tightening of non-preloaded bolts shall be conducted as follow: EN 1090-2:2008+A1:2011 The connected components shall be drawn together such that they archive firm contact.
Read more about Tightening of non-preloaded bolts

01 March 2016
True 3.2 Test Certificate can be issued only from a newly manufactured product and cannot be offered for products that are already manufactured and available from stock (with 3.1 Test Certificates available). Andrews Fasteners Limited in cooperation with Lloyd’s Register (LRQA) can offer independent verification of samples of a product from a selected batch that will be supplied to the customer for a product covered by Type 3.1 Test Certificate. This will be called “intent-of” Type 3.
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29 January 2016
Due to the compression ability of paint, galvanising coating and other types of surface protection , it is required that places of joints are cleaned from any coating before installation. After the installation process, depending on the type of coating of the assemblies, the whole surface can be further covered to restore corrosion protection in joint places.
Read more about Can Preload bolt assemblies (HSFG) be used on painted or galvanised surfaces?

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:
Read more about What is the minimum thread length on preload bolts?

12 January 2016
Andrews Fasteners, is using as an identification mark on their products as follow: Bolts - FAST Nuts - FAST (EN 14399) and A (EN 15048 and others)* For products manufactured starting from January 2016, each main component will retain FAST as a marking relating to manufacturer Andrews Fasteners; Washers (where applicable) - FAST or none, where marking is not required. Until stock least, products can be offered with markings previously used by a company like: AND.
Read more about Which identification mark is used by Andrews Fasteners?

18 December 2015
Currently, Holding Down Bolts doesn’t fall into Construction Product Regulation (CPR) standards and they cannot be CE (UKCA) Marked. Holding Down Bolts are manufactured in accordance with BS 7419 (British Standard). This standard is not a harmonised standard like EN/ISO, that will allow them to be CE (UKCA) marked . More about this you can read in BCSA memorandum No 17-14 . In the new edition of EN 15048:2016 (after standard will become harmonised), holding down bolts can be considered for CE (UKCA) marking after initial testing and suitability test in accordance 5.
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18 December 2015
DOP in full name means Declaration of Performance. It is a document that the manufacturer of the product should supply with every CE (UKCA) approved product in line with the requirements of the Construction Products Regulation (CPR) or equivalent in the United Kingdom. The DOP contains information about the manufacturer, the construction product/s to be CE (UKCA) Marked ; the products intended use/s and the declared essential performance characteristics of the product.
Read more about What is DOP?