A Banjo Elbow fitting (also known as an internally relieved bolt) consists of a hollow perforated bolt and a spherical fluid transfer union. The Banjo Elbows with a cutting ring are frequently discovered in gas, oil and hydraulic structures in the automotive industry (e.g.: engines and clutch).

The linked pipe to the Banjo Elbow can be either stiff or elastic.

High pressure applications (i.e. more than 50 bar) are the primary benefit of the Banjo Elbow fitting. The name derives from the appropriate form, having a big circular segment attached to a thicker pipe, usually comparable to a banjo form.

Banjo Elbow fittings have the benefit that they do not have to be twisted close to the host fitting compared to pipe fittings which force the twisting of a hose or pipe.

The Banjo Elbows by DIN 2353 prevent the danger of harm when the fitting is screwed into position by squeezing the hose. It also enables adjustment of the pipe release path relative to the fitting, then tightening the bolt separately.