Banjo fitting

A pair of banjo bolts as used in automotive braking.

Two banjo fittings atop automotive brake calipers. Note the copper 'crush washer' in the 'gap' between the fitting and body of the caliper; this completes the seal.

A Banjo fitting comprises a perforated hollow bolt and spherical union for fluid transfer. They are commonly found in automotive fuel, oil and hydraulic systems (i.e.: brakes and clutch). The main advantage of the fitting is in high pressure applications, i.e. more than 50 bar. The name stems from the shape of the fitting, having a large circular section connected to a thinner pipe, generally similar to the shape of a banjo.

Also called an internally relieved bolt, see description at http://www.tpub.com/content/logistics/53/06/299/01-259-2116.htm

Common applications

• Brake caliper connectors
• Turbo charger oil feeds
• Power steering fluid
• Fuel filter connectors
• Hydraulic clutch systems

External links

• http://www.autospeed.com/cms/A_2608/article.html