<p><span lang="EN-GB">This document specifies calculation methods for nuts designed to be mated with bolts, screws and studs in accordance with ISO 898-1, for use in bolted joints under tensile loading and for tightening with tension and torsion taking into account the three possible failure modes: bolt breaking, bolt thread stripping and nut thread stripping (see </span>Clause 5<span lang="EN-GB">).</span></p>
<p><span lang="EN-GB">The terms “bolt” and “nut” are used as the general terms in this document for externally threaded fasteners (i.e. bolts, screws and studs) and internally threaded fasteners (i.e. tapped holes), respectively.</span></p>
<p><span lang="EN-GB">This document is primarily applicable to steel hexagon nuts:</span></p>
<ul>
<li><span lang="EN-GB">with ISO metric thread (coarse pitch and fine pitch, see ISO 68-1);</span></li>
<li><span lang="EN-GB">with diameter/pitch combinations according to ISO 261 and ISO 262;</span></li>
<li><span lang="EN-GB">with thread tolerances according to ISO 965-1 and ISO 965-2;</span></li>
<li><span lang="EN-GB">with nominal thread diameters 5 mm ≤ D ≤ 39 mm, and additionally with D < 5 mm and D > 39 mm (see </span>Annex C<span lang="EN-GB">);</span></li>
<li><span lang="EN-GB">with a hexagon shape and width across flats s ≥ 1,4D.</span></li>
</ul>
<p><span lang="EN-GB">The calculation methods are also applicable to non-standard nuts or internally threaded parts with ISO metric threads. However, dimensional factors affecting the rigidity of nuts such as the width across flats, outer diameter of cylindrical nuts or other features (e.g. shape of flange) as well as thread tolerances can affect the loadability of the individual bolt/nut assemblies, see </span>Annex A<span lang="EN-GB"> for influencing factors.</span></p>
Registration number (WIID)
84884
Scope
<p><span lang="EN-GB">This document specifies calculation methods for nuts designed to be mated with bolts, screws and studs in accordance with ISO 898-1, for use in bolted joints under tensile loading and for tightening with tension and torsion taking into account the three possible failure modes: bolt breaking, bolt thread stripping and nut thread stripping (see </span>Clause 5<span lang="EN-GB">).</span></p>
<p><span lang="EN-GB">The terms “bolt” and “nut” are used as the general terms in this document for externally threaded fasteners (i.e. bolts, screws and studs) and internally threaded fasteners (i.e. tapped holes), respectively.</span></p>
<p><span lang="EN-GB">This document is primarily applicable to steel hexagon nuts:</span></p>
<ul>
<li><span lang="EN-GB">with ISO metric thread (coarse pitch and fine pitch, see ISO 68-1);</span></li>
<li><span lang="EN-GB">with diameter/pitch combinations according to ISO 261 and ISO 262;</span></li>
<li><span lang="EN-GB">with thread tolerances according to ISO 965-1 and ISO 965-2;</span></li>
<li><span lang="EN-GB">with nominal thread diameters 5 mm ≤ D ≤ 39 mm, and additionally with D < 5 mm and D > 39 mm (see </span>Annex C<span lang="EN-GB">);</span></li>
<li><span lang="EN-GB">with a hexagon shape and width across flats s ≥ 1,4D.</span></li>
</ul>
<p><span lang="EN-GB">The calculation methods are also applicable to non-standard nuts or internally threaded parts with ISO metric threads. However, dimensional factors affecting the rigidity of nuts such as the width across flats, outer diameter of cylindrical nuts or other features (e.g. shape of flange) as well as thread tolerances can affect the loadability of the individual bolt/nut assemblies, see </span>Annex A<span lang="EN-GB"> for influencing factors.</span></p>
