EN 74-3 specifies for non adjustable base plates and loose spigots to be used with 48,3 mm diameter tubes in scaffolds and falsework:-materials; -design requirements; -test procedure; -assessment.A base plate with a means of limited vertical adjustment, called a "base jack", is dealt with in EN 12811 1. NOTEIn the text of this standard, the term "loose spigot" is used instead of the "spigot pin" in the title.