Water jet is an industrial tool capable of cutting a wide variety of materials using a very high-pressure jet of water, or a mixture of water and an abrasive substance. The term abrasive jet refers to the use of a mixture of water and abrasive to cut hard materials such as metal or granite, while the terms pure waterjet and water-only cutting refer to waterjet cutting without the use of added abrasives, often used for softer materials such as wood or rubber.
The nozzle design created a mix of high-pressure water and abrasive for the purpose of wet blasting. Waterjets can make parts to very tight tolerances, some systems can create parts with a tolerance as close as 0.001″ (0.025 mm). Typical part tolerances range from between 0.003″ and 0.005″ of an inch.
Waterjet cutting is often used during fabrication of machine parts. It is the preferred method when the materials being cut are sensitive to the high temperatures generated by other methods. Waterjet cutting is used in various industries, including mining and aerospace, for cutting, shaping, and reaming.