A process for the production of a sulfur containing organosilicon compound of the formula (I) Z-Alk-Sx-Alk-Z, where Z is the grouping: ##STR8## in which R1 is an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, benzyl, phenyl or phenyl substituted with at least one methyl, ethyl or chloro group and R2 is alkoxy of 1 to 8 carbon atoms, methoxyethoxy, cycloalkox