BS EN ISO 2320-2015 pdf download.Fasteners一Prevailing torque steel nuts – Functional properties. 5 Thread Threads for prevailing torque nuts shall be in accordance with ISO 965-2 except for the prevailing torque feature: a) for prevailing torque non-metallic insert type nuts, the GO gauge shall be suitable for free installation (by hand) until it Is seated against the prevailing torque feature; b) for prevailing torque all metal type nuts, the GO gauge shall be suitable for free installation (by hand) to one pitch at least. 6 Lubrication At the option of the manufacturer, a lubricant may be applied to the manufacturing lot to fulfil the functional requirements. 7 Mechanical properties of prevailing torque nuts The mechanical properties of prevailing torque nuts shall conform to ISO 898-2. With regard to proof load, the test method specified in 92 shall apply. 8 Functional requirements for prevailing torque properties The prevailing-on torque shall not exceed the value specified br the applicable nut in Tables ito 7. The prevailing-off torque shall exceed the value specified for the applicable nut in Tables ito 7. For delivery inspection, the first installation/removal test applies, unless otherwise agreed. For initial type testing and in case of dispute, a 5th removal test shall also be applied unless otherwise agreed. Prevailing torque performance decreases as a function of the number of reuses; the consumer shall take into consideration the consequences of the decreased performance before any reuse of the nut. By request of the customer, a temperature influence test for prevailing torque non-metallic insert type nuts as specified in Annex A may be carried out.BS EN ISO 2320 pdf download.
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