Abstract: The present invention pertains to the technical field of network structures and more particularly it relates to a knot joint of the kind adapted to engage a number of rods converging in the joint itself.According to the invention the joint (1) comprises a central core (2) and first and second couplings in alignment with said rods (3) and connected to said core (2) and said rods (3) respectively, as well as suitable to be engaged with each other by a restrained fixing, said first and second couplings consisting of clamps (8) and inserts (9), the shape of which mates with that of said clamps (8), insertable into the latter by causing them to slide in a sense transverse to the extension direction of said rods (3).