In mechanical engineering, hydraulic systems of various sizes are used in many applica-tions. A hydraulic system that is as ideal as possible should have as little mass and volume as possible, so their development involves the optimisation of mass and size. In many hydraulic systems, hydraulic elements are combined into hydraulic manifolds for this pur-pose, especially frequently in mobile hydraulics. Closing and sealing technological bores is a major challenge for engineers in the design and manufacture of hydraulic manifolds. In this thesis, we first presented the existing methods for pluging and sealing the bores of hydraulic manifolds. Then, we conducted an experimental investigation of the quality of hole closure using standard threaded pins in combination with sealant. For the needs of the test, we made test specimens and a test site. The paper presents the results of measurements of leakage of various threaded pins with and without the use of sealant.
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