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Imperial sizes

Imperial bar appellations represent rebar stick diameters in fractions of an inch, such that #8 = 8/8 inch = 1 inch diameter.

Imperial

Bar Size

"Soft"

Metric Size

Weight

(lb/ft)

Nominal Diameter

(in)

Nominal Diameter

(mm)

Nominal Area

(in²)

#3 #10 0.376 0.375 9.525 0.11
#4 #13 0.668 0.500 12.7 0.20
#5 #16 1.043 0.625 15.875 0.31
#6 #19 1.502 0.750 19.05 0.44
#7 #22 2.044 0.875 22.225 0.60
#8 #25 2.670 1.000 25.4 0.79
#9 #29 3.400 1.128 28.65 1.00
#10 #32 4.303 1.270 32.26 1.27
#11 #36 5.313 1.410 35.81 1.56
#14 #43 7.650 1.693 43 2.25
#18 #57 13.60 2.257 57.33 4.00

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Metric sizes

Metric bar designation represents the specified rebar stick diameter in millimeters, rounded to the nearest 5 mm.

Metric

Bar Size

Mass

(kg/m)

Nominal Diameter

(mm)

Cross-Sectional

Area (mm2)

#10 M 0.785 11.3 100
#15 M 1.570 16.0 200
#20 M 2.355 19.5 300
#25 M 3.925 25.2 500
#30 M 5.495 29.9 700
#35 M 7.850 35.7 1000
#45 M 11.775 43.7 1500
#55 M 19.625 56.4 2500

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