Toolchest · Datasheet

Accumath Toolchest — Reinforcing Bar (Rebar) Dataset: Notes

Dataset file: accumath-rebar.csv Built: 2026-10-20

11 rows: US customary deformed bar sizes #3, #4, #5, #6, #7, #8, #9, #10, #11, #14, #18. There are no #12, #13, #15, #16, or #17 bars in the system — the sequence runs #3–#11, then jumps to #14 and #18, whose dimensions descend from the areas of the old 1½ in. and 2 in. square bars.
Columns: bar number; soft-metric companion designation; nominal diameter (in and mm); nominal cross-sectional area (in² and mm²); nominal unit weight/mass (lb/ft and kg/m); nominal perimeter (in); published Grade 60 strength minimums for A615 and A706 (ksi); source.
Nominal dimensions are those of a plain round bar having the same unit weight as the deformed bar — the published nominal values are the dataset values; no area was recomputed from diameter.

Sources and legal basis

The dimensional values (weight, diameter, area, perimeter, and the SI companions) are the standardized Table 1 values of ASTM A615/A706, which are identical in both specifications. They were taken from openly published republications of that table — the ANSI webstore's published previews of ASTM A706/A706M and A615/A615M, CRSI's public reinforcing-basics pages, and producer/industry size charts (CMC/Nucor/Gerdau-class published rebar charts and industry reference charts), all of which print the same numbers. The ASTM documents themselves were not copied; the numbers are standardized functional facts republished across the entire industry. Position (Jeff, 2026-10-20): publicly published facts do not require licensure.
Strength minimums are the published specification values: A615 mechanical-requirements table (Grades 40/60/75/80: tensile 60/90/100/105 ksi, yield 40/60/75/80 ksi) and A706 mechanical-requirements summary (Grade 60: tensile 80 ksi, yield 60 ksi with a 78 ksi maximum; Grade 80: tensile 100 ksi, yield 80–98 ksi).
One precision note: independent secondary charts sometimes print slightly different SI figures (e.g., 200 mm² for #5, 509 mm² for #8, 0.561 kg/m for #3) because they convert or round themselves. This dataset uses the SI companion values published alongside the inch-pound values in the standard bar tables themselves (199 mm², 510 mm², 0.560 kg/m).

ASTM A615 — deformed and plain carbon-steel bars, the general-purpose default. The specification includes no chemistry controls aimed at weldability; its own guidance is that welding should be approached with caution and that A706 be considered where weldable bar is required. Bars are rolled with the type mark "S".
ASTM A706 — deformed and plain low-alloy bars, the weldable grade. It controls chemical composition (carbon ≤ 0.30 %, manganese ≤ 1.50 %, phosphorus ≤ 0.035 %, sulfur ≤ 0.045 %, silicon ≤ 0.50 %) and caps the carbon equivalent at CE ≤ 0.55 % (CE = %C + %Mn/6 + %Cu/40 + %Ni/20 + %Cr/10 − %Mo/50 − %V/10). It also controls tensile properties both ways: Grade 60 yield is 60 ksi minimum and 78 ksi maximum, tensile strength must be at least 1.25 × the actual yield strength, which is why A706 is the specified bar for seismic applications. Bars are rolled with the type mark "W".

The strength columns record Grade 60 only: A615 Gr 60 fy = 60 ksi, fu = 90 ksi; A706 Gr 60 fy = 60 ksi, fu = 80 ksi.
Both specifications also define Grade 80 with published minimums — A615 Gr 80: fy 80 ksi, fu 105 ksi; A706 Gr 80: fy 80 ksi, fu 100 ksi. CRSI Engineering Technical Note ETN-D-7-20 documents the use of Grade 80 bars under ACI 318-19. Grade 80 values are not columns in this dataset.
Strength is a grade property, not a size property — the same minimums apply to every size in the grade. The strength columns are populated for #3–#11 per the dataset scope; #14/#18 are left blank by scope, not because the grade minimums differ.

14 (1.693 in., 2.25 in², 7.650 lb/ft) and #18 (2.257 in., 4.00 in², 13.600 lb/ft) are the
jumbo sizes. The specifications' published bend-test pin diameters for them are the largest in the tables — 9d for A615 Grade 60 and 8d for A706 Grade 60, versus 3½d–7d for the smaller sizes — reflecting the forming effort these bars take.
A615 in its current editions also lists a #20 bar (2.500 in., 4.91 in²); it is outside this dataset's #3–#18 scope and outside common practice, so it is not included.

The soft_metric_designation column (10, 13, 16, 19, 22, 25, 29, 32, 36, 43, 57) is the soft-conversion companion printed with each US size in the A615M/A706M tables — the same physical bars, designated by approximate diameter in millimetres. CRSI describes this soft-conversion practice on its public pages.
Canadian hard-metric sizes (CSA G30.18: 10M, 15M, 20M, 25M, 30M, 35M, 45M, 55M) are a different sizing system with different areas (e.g., a Canadian 20M is 300 mm², not the US #6's 284 mm²) and are not included — the sources used publish the US/soft-metric table only. Do not treat the soft-metric column as the Canadian map.

No Grade 80 columns (published minimums recorded in the notes above instead).
No Canadian CSA G30.18 hard-metric table (see above).
No elongation or bend pin columns in the CSV; bend pins for #14/#18 are noted above.