RSA (BS 4-1)

BS 4-1:2005 · 29 sections

Free Reference Data

Rolled Steel Angles (RSA) to BS 4-1:2005 are equal-leg angle sections following British Standard dimensions, used in secondary framing, bracing, and connections on UK-designed projects.

Designation	a (mm)	b (mm)	t (mm)	A (cm²)	G (kg/m)	I_xx (cm⁴)	W_yy (cm³)
RSA 20×20×3	20	—	3	1.12	0.88	0.4	0.29
RSA 25×25×3	25	—	3	1.42	1.12	0.8	0.46
RSA 25×25×4	25	—	4	1.85	1.45	1.02	0.6
RSA 30×30×3	30	—	3	1.74	1.36	1.4	0.67
RSA 30×30×4	30	—	4	2.27	1.78	1.79	0.87
RSA 40×40×4	40	—	4	3.08	2.42	4.47	1.56
RSA 40×40×5	40	—	5	3.79	2.97	5.43	1.93
RSA 50×50×5	50	—	5	4.8	3.77	10.96	3.07
RSA 50×50×6	50	—	6	5.69	4.47	12.76	3.63
RSA 60×60×5	60	—	5	5.82	4.57	19.39	4.51
RSA 60×60×6	60	—	6	6.91	5.42	22.8	5.37
RSA 60×60×8	60	—	8	9.03	7.09	28.89	6.94
RSA 70×70×6	70	—	6	8.13	6.38	37.84	7.5
RSA 70×70×7	70	—	7	9.4	7.38	43.39	8.66
RSA 80×80×6	80	—	6	9.35	7.34	57.34	9.87
RSA 80×80×8	80	—	8	12.3	9.63	74.4	13
RSA 90×90×8	90	—	8	13.9	10.9	107	16.7
RSA 90×90×10	90	—	10	17.1	13.4	130	20.6
RSA 100×100×8	100	—	8	15.5	12.2	148	20.5
RSA 100×100×10	100	—	10	19.2	15.1	182	25.5
RSA 120×120×8	120	—	8	18.7	14.7	258	29.7
RSA 120×120×10	120	—	10	23.2	18.2	318	36.9
RSA 120×120×12	120	—	12	27.5	21.6	374	43.8
RSA 150×150×10	150	—	10	29.3	23	630	57.9
RSA 150×150×12	150	—	12	34.8	27.3	744	68.8
RSA 150×150×15	150	—	15	43.2	33.9	906	84.9
RSA 200×200×16	200	—	16	62.6	49.1	2596	178
RSA 200×200×18	200	—	18	70.1	55	2882	199
RSA 200×200×20	200	—	20	77.5	60.8	3170	219