scope:

This part of ISO 28927 specifies a laboratory method for measuring hand-transmitted vibration emission at the handles of hand-held power-driven wrenches and nutrunners with impact or impulse action. It also covers screwdrivers; shut-off, ratchet or stall types and nutrunners; shut-off or stall types. It is a type-test procedure for establishing the magnitude of vibration in the gripping areas of a power tool when operating on a specified load. This standard covers all types of designs; straight, pistol grip, angle, bow handles.
This part of ISO 28927 applies to hand-held power tools intended for tightening and unfastening threaded fasteners. The method has been tested for fastening tasks only. This part of ISO 28927 covers power tools with 6,3 mm to 40 mm (1/4 in to 1 ½ in) male or female drive output shafts; other geometries are also included.
The power tools covered by this part of ISO 28927 may be pneumatically driven, or driven by other means.
Typical tools are illustrated in figures 1-9.
This part of ISO 28927 applies to the tools mentioned in clause 5. It does not apply to nutrunners designed to be used only in torque reaction arms.
It is intended that the results be used to compare different models of the same type of power tool.