GR5 titanium alloy Banjo bolts M10*1.0 Pitch

Why are they called Banjo bolts?

A Banjo fitting or internally relieved bolts comprises a perforated hollow bolt and spherical union for fluid transfer...

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.

What is the purpose of a banjo bolt?

A banjo bolt is one half of a banjo fitting.Banjo fitting are frequently used to pass pressurized fluid...That hole allows fluid transfer into the other part of the fitting,which is also hollow.

The Banjo bolts passes through the center of the fitting,which also has a hole in it.