Content with tag faq

It is Andrews Fasteners’ standard practice to supply customers a Declaration of Conformity and Test Certificates for purchased products (in general this is only on products grade 8.8 and above). These documents may not be supplied for every customer we serve, as we know, that some of them may not need them, or need them at a later time. We operate an automatic Test Certificates list where, for a customer who requests it with us, test certificates are sent automatically by our staff in the Quality Department every morning or through the working day once goods have been invoiced.
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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 (that 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.
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Apart from dimensional differences ( bigger heads of 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.
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When ordering Preloaded Assemblies (EN 14399-1) to be installed with Direct Tension Indicator Washers (DTIs) , 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? ↬

Customers very often ask for torque figures for the installation of non-preloaded structural bolting 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.
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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 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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Due to the compression ability of paint, galvanising coating and other types of surface protection , it is required that places of joints for high-strength structural bolting assemblies for preloading 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. Please refer to EN 1090-2:2018 pt. 8.
Read more about Can high-strength structural bolting assemblies for preloading (HSFG) be used on painted or galvanised surfaces? ↬

The minimum thread length is calculated strictly according to EN 14399-3 for high-strength structural bolting assemblies for preloading - System HR and EN 14399-7 for high-strength structural countersunk bolting assemblies for preloading - 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 the first full thread.
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Andrews Fasteners is using as an identification mark on their products as follows: 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.
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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 per BS 7419 ](/standards/bs-7419-holding-bolts-basic-dimensions) (British Standard). This standard is not a harmonised standard like EN/ISO, which will allow them to be CE (UKCA) marked . More about this can be read in BCSA memorandum No 17-14**](/downloads/news/2014/Holding-Down-Bolts-and-CE-marking.pdf). In the new edition of EN 15048:2016 (after the standard will become harmonised), holding down bolts can be considered for CE (UKCA) marking after initial testing and suitability test following 5.
Read more about Can holding down bolts (foundation bolts) be CE (UKCA) marked? ↬