This standard BS EN ISO 5830:2021 Resistance spot welding. Male electrode caps is classified in these ICS categories:
25.160.30 Welding equipment
This International Standard specifies the dimensions and tolerances for male electrode caps for resistance spot welding when a female taper (see ISO 1089) is used to fix the electrode adaptor (see ISO 5829).
It only applies to electrode caps for which the electrode force Fmax, given for the diameter d1, does not exceed 4,0 kN.