Standard: ASTM A615/A615M · ASTM A706/A706M
In the US system the bar number is the nominal diameter in eighths of an inch up to #8; the soft-metric number is the diameter rounded to whole millimetres. The bar is the same — only its name differs.
| Bar size | Soft metric | Diameter in | Diameter mm | Mass lb/ft | Mass kg/m |
|---|---|---|---|---|---|
| #3 | #10 | 0.375 | 9.5 | 0.376 | 0.560 |
| #4 | #13 | 0.500 | 12.7 | 0.668 | 0.994 |
| #5 | #16 | 0.625 | 15.9 | 1.043 | 1.552 |
| #6 | #19 | 0.750 | 19.1 | 1.502 | 2.235 |
| #7 | #22 | 0.875 | 22.2 | 2.044 | 3.042 |
| #8 | #25 | 1.000 | 25.4 | 2.670 | 3.973 |
| #9 | #29 | 1.128 | 28.7 | 3.400 | 5.060 |
| #10 | #32 | 1.270 | 32.3 | 4.303 | 6.404 |
| #11 | #36 | 1.410 | 35.8 | 5.313 | 7.907 |
| #14 | #43 | 1.693 | 43.0 | 7.650 | 11.38 |
| #18 | #57 | 2.257 | 57.3 | 13.60 | 20.24 |
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