Steel bar reinforcement, also referred to as rebar, comes in various diameters suitable for different structural concrete applications. This post outlines some of the most frequently used bar size diameters according to ASTM specifications.
#3 bar = 0.375 in diameter
#4 bar = 0.500 in diameter
#5 bar = 0.625 in diameter
#6 bar = 0.750 in diameter
#7 bar = 0.875 in diameter
#8 bar = 1.000 in diameter
#9 bar = 1.128 in diameter
#10 bar = 1.270 in diameter
Metric equivalents are also commonly used:
8mm rebar
10mm rebar
12mm rebar
16mm rebar
20mm rebar
25mm rebar
32mm rebar
Knowing standard rebar diameter designations can help select the appropriately sized bars for construction plans and bending schedules. The diameters listed above cover a wide range of reinforcing needs for slabs, beams, columns and other reinforced concrete elements.
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