Everything you NEED to know about Banjo bolts in 5 minutes

Table Of Contents:

• what is a banjo bolt?
• where are banjo bolts used?
• Advantages of using them
• Disadvantages of using them
• Banjo Bolts here at Coler

What Is A Banjo Bolt?

Banjo bolts are bolts with a hole through the center and a flat, ring-like fitting. Often used in hydraulic systems, particularly in motorcycles, cars, and some aircraft. They connect fluid lines to components like brake calipers or master cylinders, using washers to create a secure seal. The bolt typically goes through the fitting, and then a washer is used on either side to create a tight seal. This design helps manage fluid flow while maintaining a secure connection in tight spaces.

Where can they be used?

As stated above, they are often used in hydraulic systems, the automotive industry, some aircraft, and industrial machines. Here at Coler, we are a leading manufacturer and supplier of high-quality banjo bolts. We can supply any metric or imperial sized washers, these are supplied across many different sectors such as automotive, health care, agriculture and more.

Advantages of using Banjo Bolts…

1) One of the main advantages of using Banjo Bolts is the versatility of them. They can be used in various systems like brakes, fuel, oil, and clutch lines, making them adaptable for different applications. Specially, at Coler, we have the capabilities to manufacture any standard size and are able to work with your team to meet your exact specifications – our specialty is custom sizes of banjo bolts.

2) A second advantage, is the fact they are extremely durable and reliable: Banjo bolts are typically made from high-quality materials such as stainless steel. This ensures that they can withstand harsh conditions, including exposure to moisture, chemicals, and extreme temperatures, without deteriorating or corroding. Stainless steel’s resistance to rust and wear makes banjo bolts particularly well-suited for use in demanding environments, such as automotive, aerospace, and hydraulic systems.

3) Reduced Stress on Components: Since the banjo bolt system provides a uniform clamping force and can handle vibration well, it reduces the chances of stress on the components it connects, helping to extend their lifespan. They reduce stress by distributing clamping force evenly across the connection. Their design, often featuring sealing washers, ensures a uniform pressure on the mating surfaces, minimising the risk of localized deformation or damage. This is particularly important in high-vibration environments, as banjo bolts are more resistant to loosening and wear compared to traditional fittings.

Disadvantages of using Banjo Bolts…

1) Stress on the bolt: The design can sometimes put stress on the bolt, leading to wear or failure if not properly maintained or if subjected to high pressure. Since the banjo bolt connects a fluid line to a component, it can face significant pressure from the fluid passing through it. Over time, this can cause stress on the bolt, especially if it’s frequently removed and reinstalled, or if subjected to excessive pressure. If the bolt becomes weakened or damaged, it may fail and cause leaks or loss of fluid, which could lead to system malfunction.

2) Leak potential: If washers aren’t properly seated or the bolt isn’t torqued correctly, leaks can occur at the connection point. Banjo bolts rely on washers to create a seal between the bolt, fitting, and fluid line. If the washers aren’t correctly positioned, damaged, or made of the wrong material, fluid can leak. Even a small issue with torque can cause a weak seal, which is especially problematic in hydraulic systems where even minor leaks can affect performance or safety.

3) Complex Instillation: Installing a banjo bolt often requires precise alignment of the washers, the bolt, and the fitting. In tight spaces, this can be a challenge, making installation more time-consuming. If you’re working in an area with limited access or using multiple banjo bolts, it can become tedious to ensure everything is perfectly lined up and torqued correctly.

Banjo Bolts here at Coler

Here at Coler, We have the capabilities to manufacture any standard size and are able to work with your team to meet your exact specifications – our specialty is custom sizes of banjo bolts. We can also supply any metric or imperial sized washers, these are supplied across many different sectors such as automotive, health care, agriculture and more. We can manufacture banjo bolts out of plastic, steel, aluminium or brass. We can offer a range of plating options, with anything from zinc plating to GeoMet 500 to phosphating. Let us know your plating requirements and we will be able to find a solution that suits you.

For more information, or to place an order, get in touch with our team via Sales@Coler.co.uk

We manufacture banjo bolts to drawing in steel and stainless, single or double, in prototype and production quantities.