Steel size tables

Flat bar weights

Weight per metre of steel flat bar, calculated at 7,850 kg/m³. Flat bar is used for railings, brackets, stiffeners and fixings.

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Flat bar	Width mm	Thickness mm	kg/m	kg per 6 m
20 x 5 FB	20	5	0.79	4.7
20 x 6 FB	20	6	0.94	5.7
20 x 8 FB	20	8	1.26	7.5
20 x 10 FB	20	10	1.57	9.4
20 x 12 FB	20	12	1.88	11.3
20 x 15 FB	20	15	2.35	14.1
25 x 5 FB	25	5	0.98	5.9
25 x 6 FB	25	6	1.18	7.1
25 x 8 FB	25	8	1.57	9.4
25 x 10 FB	25	10	1.96	11.8
25 x 12 FB	25	12	2.35	14.1
25 x 15 FB	25	15	2.94	17.7
25 x 20 FB	25	20	3.92	23.5
30 x 5 FB	30	5	1.18	7.1
30 x 6 FB	30	6	1.41	8.5
30 x 8 FB	30	8	1.88	11.3
30 x 10 FB	30	10	2.35	14.1
30 x 12 FB	30	12	2.83	17.0
30 x 15 FB	30	15	3.53	21.2
30 x 20 FB	30	20	4.71	28.3
30 x 25 FB	30	25	5.89	35.3
40 x 5 FB	40	5	1.57	9.4
40 x 6 FB	40	6	1.88	11.3
40 x 8 FB	40	8	2.51	15.1
40 x 10 FB	40	10	3.14	18.8
40 x 12 FB	40	12	3.77	22.6
40 x 15 FB	40	15	4.71	28.3
40 x 20 FB	40	20	6.28	37.7
40 x 25 FB	40	25	7.85	47.1
50 x 5 FB	50	5	1.96	11.8
50 x 6 FB	50	6	2.35	14.1
50 x 8 FB	50	8	3.14	18.8
50 x 10 FB	50	10	3.92	23.5
50 x 12 FB	50	12	4.71	28.3
50 x 15 FB	50	15	5.89	35.3
50 x 20 FB	50	20	7.85	47.1
50 x 25 FB	50	25	9.81	58.9
60 x 5 FB	60	5	2.35	14.1
60 x 6 FB	60	6	2.83	17.0
60 x 8 FB	60	8	3.77	22.6
60 x 10 FB	60	10	4.71	28.3
60 x 12 FB	60	12	5.65	33.9
60 x 15 FB	60	15	7.07	42.4
60 x 20 FB	60	20	9.42	56.5
60 x 25 FB	60	25	11.78	70.7
75 x 5 FB	75	5	2.94	17.7
75 x 6 FB	75	6	3.53	21.2
75 x 8 FB	75	8	4.71	28.3
75 x 10 FB	75	10	5.89	35.3
75 x 12 FB	75	12	7.07	42.4
75 x 15 FB	75	15	8.83	53.0
75 x 20 FB	75	20	11.78	70.7
75 x 25 FB	75	25	14.72	88.3
80 x 5 FB	80	5	3.14	18.8
80 x 6 FB	80	6	3.77	22.6
80 x 8 FB	80	8	5.02	30.1
80 x 10 FB	80	10	6.28	37.7
80 x 12 FB	80	12	7.54	45.2
80 x 15 FB	80	15	9.42	56.5
80 x 20 FB	80	20	12.56	75.4
80 x 25 FB	80	25	15.70	94.2
100 x 5 FB	100	5	3.92	23.5
100 x 6 FB	100	6	4.71	28.3
100 x 8 FB	100	8	6.28	37.7
100 x 10 FB	100	10	7.85	47.1
100 x 12 FB	100	12	9.42	56.5
100 x 15 FB	100	15	11.78	70.7
100 x 20 FB	100	20	15.70	94.2
100 x 25 FB	100	25	19.62	117.8
120 x 5 FB	120	5	4.71	28.3
120 x 6 FB	120	6	5.65	33.9
120 x 8 FB	120	8	7.54	45.2
120 x 10 FB	120	10	9.42	56.5
120 x 12 FB	120	12	11.30	67.8
120 x 15 FB	120	15	14.13	84.8
120 x 20 FB	120	20	18.84	113.0
120 x 25 FB	120	25	23.55	141.3
150 x 5 FB	150	5	5.89	35.3
150 x 6 FB	150	6	7.07	42.4
150 x 8 FB	150	8	9.42	56.5
150 x 10 FB	150	10	11.78	70.7
150 x 12 FB	150	12	14.13	84.8
150 x 15 FB	150	15	17.66	106.0
150 x 20 FB	150	20	23.55	141.3
150 x 25 FB	150	25	29.44	176.6
200 x 5 FB	200	5	7.85	47.1
200 x 6 FB	200	6	9.42	56.5
200 x 8 FB	200	8	12.56	75.4
200 x 10 FB	200	10	15.70	94.2
200 x 12 FB	200	12	18.84	113.0
200 x 15 FB	200	15	23.55	141.3
200 x 20 FB	200	20	31.40	188.4
200 x 25 FB	200	25	39.25	235.5

93 sizes. Nominal values for planning and estimating; use the manufacturer's section tables for structural design. Availability varies - we source the steel for each job.

Questions

Frequently asked questions

How heavy is 50 x 10 flat bar?

About 3.93 kg per metre.

How do I work out flat bar weight?

Width (mm) x thickness (mm) x 0.00785 gives kg per metre.

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