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The bearings enable relative linear or rotational motion between the two parts by reducing the friction coefficient. Plain bearings are a frequently used bearing sub-type, most likely due to their fairly simple geometry and low manufacturing cost. Since no additional rolling elements are required, their outer diameter is small, while the large contact surface increases the load-carrying capacity. The performance of a plain bearing can be evaluated through a number of criteria, such as its efficiency [1], durability [2], or load-carrying capacity [3]. As such, it is influenced by several parameters: load, sliding velocity, operating temperature, surface roughness, clearance between the plain bearing and the shaft [4], and material. Composite materials are often used in the design of machine elements to provide engineers with a wider range of possibilities in terms of material mechanical properties. The composites have diverse mechanical properties, which are usually achieved by combining different matrix, filler, and reinforcement materials. For example, polymer matrices are chemically resistant but are adversely affected by an increase in temperature. As noted by Prehn et al. [5], a chemically resistant polymer matrix (polyetheretherketone and epoxy resin were used in the referenced study) embedded with fibre reinforcement (CF) and filler (SiC) has improved wear properties while also enabling use in adverse environments, such as seawater [6]. Further, the working temperature often narrows the suitable matrix materials to thermally resistant ones; for example, an increase in temperature decreases the mechanical properties of polymers [7], such as the tensile strength, permissible Hertzian stress, and Young modulus, rendering them unusable. Increase in temperature reduces the tensile strength, permissible Hertzian (contact) stress, and Young modulus of polymer materials. Building on these premises, a compromise during the selection of composite materials may be required to achieve the desired bearing properties, such as the high load capacity or low power losses. As a plain bearing material, composites have several advantages when compared to the traditionally used bronze alloys [8]: higher chemical resistance, lower wear rate, vibration damping, and lower weight. For that reason, there has been a steady rise in composite use for plain bearing manufacturing. It should be noted that the composites used as plain bearing materials are thermal insulators, meaning that an increase in the working temperature will be higher. Moreover, to better understand the overall performance and limitations of the composite plain An Experimental Study of Composite Plain Bearings: The Influence of Clearance on Friction Coefficient and Temperature Miler, D., – Škec, S. – Katana, B. – Žeželj, D. Daniel Miler1 – Stanko Škec1,2* – Branko Katana1 – Dragan Žeželj1 1 University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Croatia 2 Technical University of Denmark, Denmark