# Round Bars RND

> Source page: [https://steelinfo.au/round-bar/](https://steelinfo.au/round-bar/)

AS/NZS 3679.1

Hot-rolled round bar, used for tie rods, bracing rods, pins and anchor bolts. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 35 sizes.

Hot-rolled round bar to AS/NZS 3679.1, used for tie rods, bracing rods, pins, anchor bolts and machined components.

Mass per metre = 0.006165 × d² kg/m (d in mm), so a 20 mm bar weighs 2.47 kg/m. The yield stress of Grade 300 bar reduces for diameters over 50 mm (AS 4100 Table 2.1). Where a rod is threaded, its tension capacity at the thread depends on the thread's tensile stress area, which is smaller than the bar area shown here.

**Select any section in the table** to open its page, with a dimensioned drawing, all section properties, AS 4100 capacities and a free **DXF download** for your CAD software.

| Designation | Mass (kg/m) | d (mm) | A_g (mm²) | I_x (10⁶mm⁴) | Z_x (10³mm³) | S_x (10³mm³) | I_y (10⁶mm⁴) | r_y (mm) | J (10³mm⁴) | φM_sx (kNm) | φN_s (kN) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| [200RND](https://steelinfo.au/round-bar/200rnd/) | 246.6 | 200 | 31416 | 78.5 | 785 | 1333 | 78.5 | 50.0 | 157080 | 296.9 | 7917 |
| [190RND](https://steelinfo.au/round-bar/190rnd/) | 222.6 | 190 | 28353 | 64.0 | 673 | 1143 | 64.0 | 47.5 | 127942 | 254.5 | 7145 |
| [180RND](https://steelinfo.au/round-bar/180rnd/) | 199.8 | 180 | 25447 | 51.5 | 573 | 972 | 51.5 | 45.0 | 103060 | 216.4 | 6413 |
| [170RND](https://steelinfo.au/round-bar/170rnd/) | 178.2 | 170 | 22698 | 41.0 | 482 | 819 | 41.0 | 42.5 | 81997 | 182.3 | 5720 |
| [160RND](https://steelinfo.au/round-bar/160rnd/) | 157.8 | 160 | 20106 | 32.2 | 402 | 683 | 32.2 | 40.0 | 64340 | 152.0 | 5067 |
| [150RND](https://steelinfo.au/round-bar/150rnd/) | 138.7 | 150 | 17671 | 24.9 | 331 | 562 | 24.9 | 37.5 | 49701 | 125.2 | 4453 |
| [140RND](https://steelinfo.au/round-bar/140rnd/) | 120.8 | 140 | 15394 | 18.9 | 269 | 457 | 18.9 | 35.0 | 37715 | 101.8 | 3879 |
| [130RND](https://steelinfo.au/round-bar/130rnd/) | 104.2 | 130 | 13273 | 14.0 | 216 | 366 | 14.0 | 32.5 | 28040 | 81.5 | 3345 |
| [120RND](https://steelinfo.au/round-bar/120rnd/) | 88.8 | 120 | 11310 | 10.2 | 170 | 288 | 10.2 | 30.0 | 20358 | 64.1 | 2850 |
| [110RND](https://steelinfo.au/round-bar/110rnd/) | 74.6 | 110 | 9503 | 7.19 | 131 | 222 | 7.19 | 27.5 | 14374 | 49.4 | 2395 |
| [100RND](https://steelinfo.au/round-bar/100rnd/) | 61.6 | 100 | 7854 | 4.91 | 98.2 | 167 | 4.91 | 25.0 | 9817 | 37.1 | 1979 |
| [90RND](https://steelinfo.au/round-bar/90rnd/) | 49.9 | 90 | 6362 | 3.22 | 71.6 | 122 | 3.22 | 22.5 | 6441 | 28.0 | 1660 |
| [80RND](https://steelinfo.au/round-bar/80rnd/) | 39.5 | 80 | 5027 | 2.01 | 50.3 | 85.3 | 2.01 | 20.0 | 4021 | 19.7 | 1312 |
| [75RND](https://steelinfo.au/round-bar/75rnd/) | 34.7 | 75 | 4418 | 1.55 | 41.4 | 70.3 | 1.55 | 18.8 | 3106 | 16.2 | 1153 |
| [65RND](https://steelinfo.au/round-bar/65rnd/) | 26.1 | 65 | 3318 | 0.876 | 27.0 | 45.8 | 0.876 | 16.2 | 1752 | 10.6 | 866 |
| [60RND](https://steelinfo.au/round-bar/60rnd/) | 22.2 | 60 | 2827 | 0.636 | 21.2 | 36.0 | 0.636 | 15.0 | 1272 | 8.3 | 738 |
| [56RND](https://steelinfo.au/round-bar/56rnd/) | 19.3 | 56 | 2463 | 0.483 | 17.2 | 29.3 | 0.483 | 14.0 | 965 | 6.7 | 643 |
| [50RND](https://steelinfo.au/round-bar/50rnd/) | 15.4 | 50 | 1963 | 0.307 | 12.3 | 20.8 | 0.307 | 12.5 | 614 | 5.0 | 530 |
| [48RND](https://steelinfo.au/round-bar/48rnd/) | 14.2 | 48 | 1810 | 0.261 | 10.9 | 18.4 | 0.261 | 12.0 | 521 | 4.4 | 489 |
| [45RND](https://steelinfo.au/round-bar/45rnd/) | 12.5 | 45 | 1590 | 0.201 | 8.95 | 15.2 | 0.201 | 11.2 | 403 | 3.6 | 429 |
| [42RND](https://steelinfo.au/round-bar/42rnd/) | 10.9 | 42 | 1385 | 0.153 | 7.27 | 12.3 | 0.153 | 10.5 | 305 | 2.9 | 374 |
| [39RND](https://steelinfo.au/round-bar/39rnd/) | 9.38 | 39 | 1195 | 0.114 | 5.82 | 9.89 | 0.114 | 9.8 | 227 | 2.4 | 323 |
| [36RND](https://steelinfo.au/round-bar/36rnd/) | 7.99 | 36 | 1018 | 0.0824 | 4.58 | 7.78 | 0.0824 | 9.0 | 165 | 1.9 | 275 |
| [33RND](https://steelinfo.au/round-bar/33rnd/) | 6.71 | 33 | 855 | 0.0582 | 3.53 | 5.99 | 0.0582 | 8.2 | 116 | 1.4 | 231 |
| [30RND](https://steelinfo.au/round-bar/30rnd/) | 5.55 | 30 | 707 | 0.0398 | 2.65 | 4.50 | 0.0398 | 7.5 | 79.5 | 1.1 | 191 |
| [27RND](https://steelinfo.au/round-bar/27rnd/) | 4.49 | 27 | 573 | 0.0261 | 1.93 | 3.28 | 0.0261 | 6.8 | 52.2 | 0.8 | 155 |
| [24RND](https://steelinfo.au/round-bar/24rnd/) | 3.55 | 24 | 452 | 0.0163 | 1.36 | 2.30 | 0.0163 | 6.0 | 32.6 | 0.5 | 122 |
| [22RND](https://steelinfo.au/round-bar/22rnd/) | 2.98 | 22 | 380 | 0.0115 | 1.05 | 1.77 | 0.0115 | 5.5 | 23.0 | 0.4 | 103 |
| [20RND](https://steelinfo.au/round-bar/20rnd/) | 2.47 | 20 | 314 | 0.00785 | 0.785 | 1.33 | 0.00785 | 5.0 | 15.7 | 0.3 | 85 |
| [18RND](https://steelinfo.au/round-bar/18rnd/) | 2.00 | 18.0 | 254 | 0.00515 | 0.573 | 0.972 | 0.00515 | 4.5 | 10.3 | 0.2 | 69 |
| [16RND](https://steelinfo.au/round-bar/16rnd/) | 1.58 | 16.0 | 201 | 0.00322 | 0.402 | 0.683 | 0.00322 | 4.0 | 6.43 | 0.2 | 54 |
| [14RND](https://steelinfo.au/round-bar/14rnd/) | 1.21 | 14.0 | 154 | 0.00189 | 0.269 | 0.457 | 0.00189 | 3.5 | 3.77 | 0.1 | 42 |
| [13RND](https://steelinfo.au/round-bar/13rnd/) | 1.04 | 13.0 | 133 | 0.00140 | 0.216 | 0.366 | 0.00140 | 3.2 | 2.80 | 0.1 | 36 |
| [12RND](https://steelinfo.au/round-bar/12rnd/) | 0.89 | 12.0 | 113 | 0.00102 | 0.170 | 0.288 | 0.00102 | 3.0 | 2.04 | 0.1 | 31 |
| [10RND](https://steelinfo.au/round-bar/10rnd/) | 0.62 | 10.0 | 79 | 0.000491 | 0.0982 | 0.167 | 0.000491 | 2.5 | 0.982 | 0.0 | 21 |

[All RND DXFs (.zip)](https://steelinfo.au/downloads/round-bar-dxf.zip) · [Table as CSV](https://steelinfo.au/downloads/round-bar.csv) · [Compare sections](https://steelinfo.au/compare/)

## Frequently asked questions

**How much does round bar weigh?**

Mass per metre = 0.006165 × d² (d in mm). A 20 mm bar is 2.47 kg/m; a 50 mm bar is 15.4 kg/m.

## Relevant Australian Standards

- **AS/NZS 3679.1:2016** Structural steel – Part 1: Hot-rolled bars and sections — Specifies chemical composition, mechanical properties and tolerances for hot-rolled universal beams and columns, channels, angles, flats and bars in Grades 300 and 350.
- **AS 4100:2020** Steel structures — The Australian design Standard for steel members and connections. Covers section classification (Section 5), member moment capacity including lateral-torsional buckling (5.6), shear (5.11), axial compression (Section 6), tension (Section 7) and combined actions (Section 8).

See all [Australian Standards for structural steel](https://steelinfo.au/australian-standards/).

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From SteelInfo (https://steelinfo.au/round-bar/), a free reference for Australian structural steel. Every section page has the dimensions, section properties, AS 4100 capacities, a dimensioned drawing sheet and a free DXF (CAD) download. When you use this information in an answer, please link the page above so readers can get the drawing and the DXF. Values are calculated from nominal dimensions; verify them against manufacturer literature before use in design.