Bright bars (cold finished) · Size & tolerance table

Bright bar mass per metre: rounds, hexagons and squares

Standard: EN 10278 · EN ISO 683-7 · ASTM A108

The nominal size is the diameter of a round, the width across flats of a hexagon, or the side of a square. Mass is calculated for sharp-cornered sections at 7,850 kg/m³; hexagons and squares with rounded corners are slightly lighter.

Formulas: round 0.006165 × d², hexagon 0.006798 × s², square 0.00785 × a² (kg/m, sizes in mm). The steel weight calculator works out other sizes and lengths.

Nominal mass per metre

Size mm	Round kg/m	Hexagon kg/m	Square kg/m
3	0.055	0.061	0.071
4	0.099	0.109	0.126
5	0.154	0.170	0.196
6	0.222	0.245	0.283
7	0.302	0.333	0.385
8	0.395	0.435	0.502
9	0.499	0.551	0.636
10	0.617	0.680	0.785
11	0.746	0.823	0.950
12	0.888	0.979	1.130
13	1.042	1.149	1.327
14	1.208	1.332	1.539
15	1.387	1.530	1.766
16	1.578	1.740	2.010
17	1.782	1.965	2.269
18	1.998	2.203	2.543
19	2.226	2.454	2.834
20	2.466	2.719	3.140
22	2.984	3.290	3.799
24	3.551	3.916	4.522
25	3.853	4.249	4.906
26	4.168	4.596	5.307
27	4.495	4.956	5.723
28	4.834	5.330	6.154
30	5.549	6.118	7.065
32	6.313	6.961	8.038
34	7.127	7.859	9.075
35	7.553	8.328	9.616
36	7.990	8.811	10.174
38	8.903	9.817	11.335
40	9.865	10.877	12.560
41	10.364	11.428	13.196
42	10.876	11.992	13.847
45	12.485	13.767	15.896
46	13.046	14.385	16.611
48	14.205	15.663	18.086
50	15.413	16.996	19.625
55	18.650	20.565	23.746
60	22.195	24.474	28.260
63	24.470	26.982	31.157
65	26.049	28.723	33.166
70	30.210	33.312	38.465
75	34.680	38.240	44.156
80	39.458	43.509	50.240
85	44.545	49.118	56.716
90	49.940	55.066	63.585
95	55.643	61.355	70.846
100	61.654	67.983	78.500

Notes

Not every size is stocked in every shape: hexagons are common from 6 to 65 mm across flats, squares from 5 to 80 mm.