The two end-cap parts have some reference pins which are housed in special counter-seats. Two cavities inside the end-cap are provided for housing two hexagonal nuts DIN 934. Thanks to the tapered shape of the cavity, the end-cap exerts a pressure on the inner walls of the tube, due to the tightening of the nuts, thus ensuring the tensile strength of the connection. The level of the tensile strength depends on the tube dimensional tolerances, the condition of the tube inner surfaces and the tightening torque applied.
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