ISO 16047

ISO 16047

Standard used for measuring the relationship between tightening torque, friction behavior, and clamp force generation in threaded fasteners.

Significance and Use

ISO 16047:2005 is widely applied to the research of the correlation between tightening torque and clamp force of threaded fasteners, including bolts, screws, studs, nuts, etc. The standard specifically allows manufacturers to assess the friction response, the tightening performance, the preload development, and the joint stability for all automotive, aerospace, industrial machinery, construction, and engineering applications. Torque and clamp force testing is useful in determining how fastener performance during assembly is affected by thread condition, lubrication, coatings, surface finish, and speed of fastener tightening. The method supports product development, fastener quality verification, coating evaluation, supplier comparison, and assembly process validation. Presto Stantest offers advanced torque and force testing systems suitable for ISO 16047 testing with precise torque measurement, clamp force monitoring, controlled loading conditions, and software-based result analysis for laboratory and industrial testing applications.

Scope

This standard specifies the test conditions, apparatus, and calculation methods used for torque and clamp force testing of threaded fasteners. The procedure applies mainly to metric threaded bolts, screws, studs, and nuts used under tensile loading conditions. During testing, tightening torque and generated clamp force are measured simultaneously to study torque coefficient, friction characteristics, and tightening behavior. The standard also supports evaluation of thread friction, bearing surface friction, yield clamp force, and ultimate tightening performance under controlled laboratory conditions. Testing may be carried out using standard test fixtures or application-specific joint configurations depending on the intended use.

Notes

ISO 16047:2005 is commonly followed for evaluating tightening performance and friction characteristics of threaded fasteners used in industrial and engineering assemblies. Presto Stantest provides advanced torque and clamp force testing systems suitable for fastener testing with accurate measurement systems, controlled tightening conditions, and software-based reporting solutions for research, quality control, and product validation laboratories.