Content with Non-preloaded

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?

01 September 2017
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.
Read more about Tightening of non-preloaded structural bolting assemblies

18 December 2015
To accommodate the thickness of zinc it is normal practice to over-tap the nut thread. This operation reduces the strength of the nut and the overall strength of the nut and bolt assembly. To improve the strength of the assembly manufacturers use either a thicker nut (increasing the number of threads between the nut and the bolt in the assembly) or a higher grade nut. BS EN 15048-1: To achieve full tensile resistance, hot-dip galvanized assemblies can require special measures, see EN ISO 10684, Annex F.
Read more about Should higher grade nuts be specified for use with galvanized or sherardized set screws and bolts on CE (UKCA) approved assemblies?