Industrial hydraulic technology is expanding and is as fascinating as ever. Hydraulic systems provide the muscle power to run the machines with the smoothest control possibilities. Many professionals design, construct, and maintain hydraulic systems every day. Several budding engineers are initiated into the technology of fluid power now and then. Therefore, spreading technological information on fluid power is essential for advancing fluid power technology. The textbook on 'Industrial Hydraulics - Basic Level (in the SI Units)' is written to meet this objective. The textbook provides a thorough and detailed exploration of hydraulic systems, covering all essential components and circuits. It begins by laying down the fundamental principles necessary to understand the topic comprehensively. The content includes in-depth discussions on hydraulic fluids, filters, reservoirs, pumps, pressure relief valves, cylinders, and motors. It also delves into the intricacies of control valves, encompassing directional control valves, flow control elements, and pressure control valves. The book thoroughly examines hydraulic accumulators, fluid conductors, and various hydraulic applications, concluding with a comprehensive look at maintenance, troubleshooting, and safety considerations specific to hydraulic systems. Throughout the text, using the SI system of units is consistently emphasised. The publication is designed to provide a comprehensive understanding of hydraulic system components, encompassing their functions, cross-sectional views, mathematical relations, symbols, advantages, and drawbacks. It extensively covers various terms, definitions, and mathematical relations related to hydraulic components, accompanied by many numerical examples to facilitate thorough analysis. Furthermore, it presents typical circuits utilising these components sequentially, progressing from simple to complex setups. Circuits in multiple positions and a summarisation of controls in a dedicated chapter offer a comprehensive overview of the different control aspects. At the end of each chapter, objective-type questions and review/numerical questions are provided to assess your comprehension of the subject matter. The appendices contain a wealth of valuable information. The language used throughout the book is straightforward, and the topics are logically arranged for enhanced comprehension. The book has been authored by an experienced professional who has trained thousands of professiona