fig8 at which the grooves 231 to 235 are arranged is not u2267 180 u00b0 and the five angles at the center are different in size the lugs 331 to 335 together with the annular surface 22 of the plasma cutting torch head interrupted by the grooves 231 to 235 form a virtual closed surface a relative to one another in any position except the joint position see fig4 b with the exception of the joint position the grooves 231 to 235 are always arranged such that the lugs resting on the annular surface 22 of the plasma cutting torch head 2 in fig4 a the lugs 331 333 334 and 335 form a quadrangle with the area a in which the center axis m of the plasma cutting torch 1 is located see fig4 a if the additional condition is not met that the sum of two adjacent angles at the center of the angles at the center u03b1 u03b2 u03b3 u03b4 and u03b5 is repeated only a triangular area a can be formed as is shown in fig9 because of the fact that the center axis m of the plasma cutting torch 1 is located in the area a the plasma cutting torch shaft 3 and the plasma cutting torch head 2 can be twisted in any direction relative to one another until the joint position is reached once the joint position is reached the plasma cutting torch head 2 slides into the plasma cutting torch shaft 3 under the effect of an axial force and the two can be inserted into one another see fig2 4 b and 5 by turning a clamping sleeve.