Round Bars RND

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.

Dimension notation

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.

Click a column heading to sort. Grade 300 capacities.

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

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.