In China's national standard GB/T 1499.2-2018 "Steels for Concrete Reinforcement Part 2: Hot-rolled ribbed steel rebars" specifies the requirements for diameter, rib shape and rib spacing in specifications and standards for cold-rolled ribbed steel rebars . The first is the diameter, which specifies the nominal diameter range of cold-rolled ribbed steel rebars, usually between 6mm and 50mm. The second is the rib shape. The rib shape of cold-rolled ribbed steel rebars is usually defined as "transverse rib" or "spiral rib". Transverse ribs are short, straight ribs running perpendicular to the longitudinal axis of the rebar. Spiral ribs are continuous spiral ribs along the length of the rebar. Finally there is the rib spacing, which specifies the maximum rib spacing for cold-rolled ribbed steel rebars. Rib spacing, also known as rib pitch or rib spacing, is measured from the peak of one rib to the peak of an adjacent rib. The maximum rib spacing depends on the nominal diameter of the reinforcement and ranges from 0.6 times to 3 times the diameter.

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