The traditional method for earthing the gland and enclosure when terminating armoured cable is to use a tag, commonly called a ‘banjo’ bolted through the enclosure or mounting plate:
Thanks to Spark123 for the photos.
This takes more time, it occupies space inside the enclosure and for external use it creates a route for possible water ingress and it damages any protective coatings, creating a corrosion risk.
An alternative is to use earthing nuts, aka Piranha nuts.
