Reinforcing Bar Identification
Each individual reinforcing bar is manufactured with a series of individual markings:
The top letter or symbol identifies the producing mill and deformation pattern.
The next marking is the bar size.
The third marking symbol designates the manufacturing material - usually either "S" for carbon-steel (ASTM A615) or "W" for low-alloy steel (ASTM A706).
Finally, there will be a grade marking (4 or 5, for 420 or 520) or by the addition of one line (420) or two lines (520) that must be at least five deformations long.
Illustration - Grade 420 rebar Illustration - Grade 520 rebar
 
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Reinforcing Bar: Inches or Millimeters?
Today, the inch-pound and the metric measurement systems co-exist throughout the U.S. construction industry. Virtually all federally funded construction is being designed and built using the metric system.
Starting in 1997, CRSI member steel mills took the initiative to convert to "soft metric" reinforcing bar production - which enables the industry to furnish the same reinforcing bars to inch-pound construction projects as well as to metric construction projects.
"Soft metric" means that units in these two systems of measurement can be used to designate the same regularly used, equivalent sizes of construction materials. The sizes of the bars have not changed. The metric sizes correspond exactly to inch-pound sizes.
From the Manual of Standard Practice:
ASTM Standard Inch-Pound Rebar table ASTM Standard Metric Rebar table
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Bar Tie Table For Various Rod Combinations
Wire ties are measured by overall length. This table will assist in estimating Wire Tie requirements for reinforcing bars. The table shows all measurements in inches.
Rod
Size |
No. 2
1/4" |
No. 3
3/8" |
No. 4
1/2" |
No. 5
5/8" |
No. 6
3/4" |
No. 7
7/8" |
No. 8
1" |
No. 9
1-1/8" |
No. 10
1-1/4" |
No. 2
1/4" |
3½ |
4 |
4½ |
5 |
5½ |
6½ |
7 |
7 |
7½ |
No. 3
3/8" |
4 |
4½ |
5 |
5 |
5½ |
6½ |
7 |
7 |
7½ |
No. 4
1/2" |
4½ |
5 |
5 |
5½ |
6 |
6½ |
7½ |
7½ |
8 |
No. 5
5/8" |
5 |
5 |
5½ |
6 |
6½ |
7 |
8 |
8 |
8½ |
No. 6
3/4" |
5½ |
5½ |
6 |
6½ |
6½ |
7½ |
8 |
8½ |
8½ |
No. 7
7/8" |
6½ |
6½ |
6½ |
7 |
7½ |
7½ |
8½ |
9 |
9½ |
No. 8
1" |
7 |
7 |
7½ |
8 |
8 |
8½ |
9 |
9½ |
10 |
No. 9
1-1/8" |
7 |
7 |
7½ |
8 |
8½ |
9 |
9½ |
10 |
10½ |
No. 10
1-1/4" |
7½ |
7½ |
8 |
8½ |
8½ |
9½ |
10 |
10½ |
10½ |
American Wire Tie is a major supplier of Rebar Tie Wire. We give you the quality you expect with competitive prices and reliable delivery schedules.
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