ISO/TS 21108:2005规定了脉冲扳手及其电源插座之间接口的尺寸和公差:电动工具的输出主轴/电源插座的内螺纹驱动端。该接口基于以圆柱形主轴为中心的套筒原理。提供了两个选项A和B的备选尺寸和公差。它适用于气动和电动脉冲工具，也可用于其他应用。

ISO/TS 21108:2005 specifies the dimensions and tolerances for the interface between impulse wrenches and their power sockets: output spindle of power tool/female drive end of power socket. This interface is based on the principle of a socket centred on the cylindrical spindle. Alternative dimensions and tolerances for two options, A and B, are provided. It is applicable to both pneumatically and electrically driven impulse tools, and could also be used in other applications.