ISO 11148-6:2012 applies to hand-held non-electric power tools (hereinafter "assembly power tools for threaded fasteners") intended for tightening or installing of threaded fasteners. The assembly power tools for threaded fasteners can be powered by compressed air, hydraulic fluid or internal combustion engines and are intended for use by one operator and supported by the operator's hand or hands, with or without a suspension, e.g. a balancer.ISO 11148-6:2012 covers air-hydraulic impulse wrenches, impact wrenches, fastener installation tools, nutrunners, open-ended spanners (crow-foot with open-ended socket or tube nut wrench), ratchet wrenches and screwdrivers.ISO 11148-6:2012 does not cover special requirements and modifications of assembly power tools for threaded fasteners for the purpose of mounting them in fixtures.ISO 11148-6:2012 deals with all significant hazards, hazardous situations or hazardous events when the tools are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer, with the exception of the use of assembly power tools for threaded fasteners in potentially explosive atmospheres.