DIN EN ISO 16047:2025-08

The standard specifies the conditions for carrying out torque/clamp force tests on threaded fasteners and related parts. The test basically applies to bolts and nuts made of carbon steel and alloy steel whose mechanical properties are specified in the standards DIN EN ISO 898-1 and DIN EN ISO 898-2 with metric thread sizes M3 to M39. The standard is also applicable to the combination of other externally and internally threaded fasteners, but not to set screws and similar threaded fasteners not under tensile stresses, and to screws which form their own mating thread. This method allows determination of the tightening characteristics of threaded fasteners and related parts. The underlying International Standard ISO 16047 has been prepared by ISO/TC 2 "Fasteners", Subcommittee SC 12 "Fasteners with metric internal thread" in collaboration with CEN/TC 185 "Fasteners" (all three secretariats: DIN, Germany). Committee NA 067-00-03 AA "Verbindungselemente mit metrischem Innengewinde" ("Fasteners with metric internal thread") at DIN Standards Committee Fasteners (FMV) at DIN e. V. is responsible for this standard.