The SRM push on fastener is a one-use fastener designed for use in assemblies which are not normally dismounted, as in order to do this it would be necessary to break the SRM. It is normally fitted to shafts with no groove but it can also be used with grooved shafts, which would help to improve its resistance to axial forces. It is used in applications which do not require great force such as electrical devices, electricity, gas or water meters, measuring instruments, etc.