Content with Non Pre-Load

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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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? ↬

Size Nominalstress area (mm^2) Class 8.8 [N] Class 10.9 [N] M12 84.3 70000 87700 (M14) 115 95500 120000 M16 157 130000 163000 (M18) 192 159000 200000 M20 245 203000 255000 M22 303 252000 315000 M24 353 293000 367000 M27 459 381000 477000 M30 561 466000 583000 M33 694 576000 722000 M36 817 678000 850000 Suitability test requirements for BS EN 15048 Non-preloaded structural bolting assemblies (CE & UKCA Marked) Property Classes 8.
Read more about Suitability test requirements (BS EN 15048) - CE & UKCA Marking ↬

Structural bolting assemblies (SB) We are a manufacturer of UKCA & CE Marked non-preloaded hexagon bolt assemblies from M12 to M36, grade 8.8 and 10.9. Andrews Fasteners Limited can manufacture and assembly test to EN 15048-2 requirements , in various grades and coatings . Description Specification Size range Hexagon Set Screw (fully threaded bolt) EN ISO 4017 EN ISO 4018 M12–M36 Hexagon Bolt (part threaded) EN ISO 4014 EN ISO 4016 M12–M36 Hexagon Nut (Regular Nuts, fullnut) EN ISO 4032 EN ISO 4033 M12–M36 Washers (Plain, Flat) min.
Read more about BS EN 15048 Non-preloaded structural bolting assemblies (CE & UKCA Marked) ↬