Rebar Specifications

Nominal Diameter Range of Rebar:

The nominal diameter of rebar ranges from 6 to 50mm, with standard nominal diameters being 6, 8, 10, 12, 14, 16, 20, 25, 32, 40, and 50mm.

Surface Shape and Dimensional Tolerances for Ribbed Rebar:

The design principles for transverse ribs on ribbed rebar should comply with the following regulations:

- The angle β between the transverse ribs and the rebar axis should not be less than 45 degrees. When this angle is not greater than 70 degrees, the direction of the transverse ribs on opposite sides of the rebar should be reversed.

- The nominal spacing l of the transverse ribs should not exceed 0.7 times the nominal diameter of the rebar.

- The angle α between the side of the transverse ribs and the rebar surface should not be less than 45 degrees.

- The total gap between the ends of the transverse ribs on adjacent sides of the rebar (including the width of the longitudinal ribs) should not exceed 20% of the nominal circumference of the rebar.

- For rebars with a nominal diameter of 12mm or less, the relative rib area should not be less than 0.055; for 14mm and 16mm rebars, it should not be less than 0.060; and for