The CUPLOCK standards are the vertical elements of the system scaffold. They are manufactured from 48.3mm diameter by 3.2mm wall thickness, high yield steel tube. They incorporate fixed lower cups and 0.5m vertical centers with a captive free upper cup to form horizontal connections to up to four other components from the system. The lowest connection is some 80mm from the standards base and there is a fixed spigot to the top to allow connections to other standards with a locking nut to allow the development of tensile forces.