Banjo bolts are hollow bolts used in fluid systems to control flow and pressure. They can create a tight seal, handle high pressure, and are commonly used in brake systems. Replacement parts are readily available, but it’s important to get the correct size and configuration.
Banjo bolts are hollow bolts used with fluid systems to control flow through fluid supply lines and other components. Superficially, some designs resemble banjos, which explains the name. They are also known as internally discharged bolts. Manufacturers of bolts and other components for liquid systems, particularly hydraulics, typically offer a range of banjo bolts in their product lineup. It is also possible to manufacture them for custom projects, if the technicians have access to metalworking equipment.
The hollow interior of the banjo bolt allows fluid to flow in and out through a small hole in the side. The bolt can get stuck in a system to control fluid pressure and performance; a common use of banjo bolts is for example in brake systems. The bolt connects the brake lines to the cylinder to control pressure in response to brake pedal actuation. Hydraulic systems turn relatively light pressure into more power, allowing the brakes to do most of the work to stop the car, rather than the driver.
This design confers a number of advantages. Banjo bolts can create a very tight seal and are often fitted with washers to prevent leaks. As long as a technician installs a bolt correctly, it should hold without leaks and other problems. Over time, your washing machine may fail, requiring replacement to prevent system leaks. Corrosion can also contribute to a banjo bolt breaking earlier than expected, making it important to keep systems clean and free of road salt and other potential corrosives.
These bolts can also handle very high pressures which is important for many fluid systems. In hydraulics, for example, the fluid is kept under pressure and this is what allows the system to work. Loss of pressure makes hydraulic systems much weaker, as can be seen when brake lines have a leak and a driver is no longer able to stop a car with the brake pedal. Pressure resistance can vary, depending on the design, and a bolt usually carries a rating with information about recommended pressure limits.
Drivers can replace banjo bolts and the entire fitting that houses the bolt as components wear out or systems adapt in a vehicle. Replacement parts are readily available. It is important to get a bolt of the correct size and configuration to avoid problems with a vehicle. Parts books usually provide detailed information, and for drivers installing aftermarket systems or parts, it’s wise to read the documentation carefully to select the right banjo fitting.
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