Waterjet nozzle tubes, also known as focusing tubes or jewel orifices, are essential components within the waterjet cutting system. These tubes are designed to house the orifice, which is the small precision-made opening that controls the waterjet stream's size and shape.

Here are some key points about waterjet nozzle tubes:

1. Orifice Housing: Nozzle tubes serve as the housing for the orifice, ensuring its stability and precise alignment within the cutting head assembly.

2. Material: They are commonly made from materials like sapphire, ruby, or other hard materials known for their wear resistance, durability, and ability to withstand the high-pressure water flow and abrasive materials (if used).

3. Precision Machining: Nozzle tubes undergo precise machining processes to create a perfectly aligned channel for the waterjet stream, contributing to accurate cutting.

4. Variety of Sizes: Nozzle tubes are available in various sizes and configurations to accommodate different orifice sizes, allowing for flexibility in adjusting the waterjet stream's characteristics, such as flow rate and cutting precision.

5. Compatibility: They are designed to be compatible with specific waterjet cutting heads and systems, ensuring proper fit and functionality within the overall cutting assembly.

6. Wear Resistance: Nozzle tubes are engineered to withstand wear caused by the high-velocity waterjet stream and, if applicable, abrasive particles, prolonging their operational lifespan.

7. Critical Component: The proper functioning and alignment of the nozzle tube and orifice are crucial for maintaining the accuracy and efficiency of the waterjet cutting process.

Waterjet nozzle tubes play a vital role in housing and aligning the orifice within the cutting head assembly, contributing to the precise and controlled generation of the waterjet stream used for cutting various materials in waterjet systems.