The most common type of reinforcing steel is the form of round bars , available in a
large range of diameters from about 0.375 to 1.375 in. for ordinary applications
and in two heavy bar sizes of about 1.75 and 2.25 in. these bars are furnished
with surface deformations for the purpose of increasing resistance to slip between
steel and concrete.
For a number of years ASTM standards have included
a second designation for bars size , the International System of Units (SI),
with the size being identified using the normal diameter in millimeters to
limit the number of bar designations, reinforcing bar producers in United
States have converted to SI for making the bars
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