RSJ Steel Beams

Order RSJ Steel Beams from Steelo

Precision-crafted and built to last, our RSJ steel beams are engineered to meet the highest standards for both residential and commercial construction. Designed for strength and reliability, they undergo strict quality checks to ensure they perform flawlessly in every project.

Ordering RSJ steel beams from Steelo is simple and stress-free. With fast lead times, competitive pricing, and a dedicated team ready to assist, we make the process seamless from start to finish. Contact us today for a bespoke quote tailored to your project needs.

RSJ Beam Dimensions (Size & Weight Chart)

	Type	Weight [kg/m]	Height [mm]	Width [mm]	Web thickness [mm]	Flange thickness [mm]
01	127 x 76 UB 13	13	127.0	76.0	4.0	7.6
02	152 x 89 UB 16	16	152.4	88.7	4.5	7.7
03	178 x 102 UB 19	19	177.8	101.2	4.8	7.9
04	203 x 102 UB 23	23	203.2	101.8	5.4	9.3
05	203 x 133 UB 25	25	203.2	133.2	5.7	7.8
06	203 x 133 UB 30	30	206.8	133.9	6.4	9.6
07	254 x 102 UB 22	22	254.0	101.6	5.7	6.8
08	254 x 102 UB 25	25	257.2	101.9	6.0	8.4
09	254 x 102 UB 28	28	260.4	102.2	6.3	10.0
10	254 x 146 UB 31	31	251.4	146.1	6.0	8.6
11	254 x 146 UB 37	37	256.0	146.4	6.3	10.9
12	254 x 146 UB 43	43	259.6	147.3	7.2	12.7
13	305 x 102 UB 25	25	305.1	101.6	5.8	7.0
14	305 x 102 UB 28	28	308.7	101.8	6.0	8.8
15	305 x 102 UB 33	33	312.7	102.4	6.6	10.8
16	305 x 127 UB 37	37	304.4	123.4	7.1	10.7
17	305 x 127 UB 42	42	307.2	124.3	8.0	12.1
18	305 x 127 UB 48	48	311.0	125.3	9.0	14.0
19	305 x 165 UB 40	40	303.4	165.0	6.0	10.2
20	305 x 165 UB 46	46	306.6	165.7	6.7	11.8
21	305 x 165 UB 54	54	310.4	166.9	7.9	13.7
22	356 x 127 UB 33	33	349.0	125.4	6.0	8.5
23	356 x 127 UB 39	39	353.4	126.0	6.6	10.7
24	356 x 171 UB 45	45	351.4	171.1	7.0	9.7
25	356 x 171 UB 51	51	355.0	171.5	7.4	11.5
26	356 x 171 UB 57	57	358.0	172.2	8.1	13.0
27	356 x 171 UB 67	67	363.4	173.2	9.1	15.7
28	406 x 140 UB 39	39	398.0	141.8	6.4	8.6
29	406 x 140 UB 46	46	403.2	142.2	6.8	11.2
30	406 x 178 UB 54	54	402.6	177.7	7.7	10.9
31	406 x 178 UB 60	60	406.4	177.9	7.9	12.8
32	406 x 178 UB 67	67	409.4	178.8	8.8	14.3
33	406 x 178 UB 74	74	412.8	179.5	9.5	16.0
34	457 x 152 UB 52	52	449.8	152.4	7.6	10.9
35	457 x 152 UB 60	60	454.6	152.9	8.1	13.3
36	457 x 152 UB 67	67	458.0	153.8	9.0	15.0
37	457 x 152 UB 74	74	462.0	154.4	9.6	17.0
38	457 x 152 UB 82	82	465.8	155.3	10.5	18.9
39	457 x 191 UB 67	67	453.4	189.9	8.5	12.7
40	457 x 191 UB 74	74	457.0	190.4	9.0	14.5
41	457 x 191 UB 82	82	460.0	191.3	9.9	16.0
42	457 x 191 UB 89	89	463.4	191.9	10.5	1707
43	457 x 191 UB 98	98	467.2	192.8	11.4	19.6
44	533 x 210 UB 101	101	536.7	210.0	10.8	17.4
45	533 x 210 UB 109	109	539.5	210.8	11.6	18.8
46	533 x 210 UB 122	122	544.5	211.9	12.7	21.3
47	533 x 210 UB 82	82	528.3	208.8	9.6	13.2
48	533 x 210 UB 92	92	533.1	209.3	10.1	15.6
49	610 x 229 UB 101	101	602.6	227.6	10.5	14.8
50	610 x 229 UB 113	113	607.6	228.2	11.1	17.3
51	610 x 229 UB 125	125	612.2	229.0	11.9	19.6
52	610 x 229 UB 140	140	617.2	230.2	13.1	22.1
53	610 x 305 UB 149	149	612.4	304.8	11.8	19.7
54	610 x 305 UB 179	179	620.2	307.1	14.1	23.6
55	610 x 305 UB 238	238	635.8	311.4	18.4	31.4
56	686 x 254 UB 125	125	677.9	253.0	11.7	16.2
57	686 x 254 UB 140	140	683.5	253.7	12.4	19.0
58	686 x 254 UB 152	152	687.5	254.5	13.2	21.0
59	686 x 254 UB 170	170	692.9	255.8	14.5	23.7
60	762 x 267 UB 134	134	750.0	264.4	12.0	25.5
61	762 x 267 UB 147	147	754.0	265.2	12.8	17.5
62	762 x 267 UB 173	173	762.2	266.7	14.3	21.6
63	762 x 267 UB 197	197	769.8	268.0	15.6	25.4
64	838 x 292 UB 176	176	834.9	291.7	14.0	18.8
65	838 x 292 UB 194	194	840.7	292.4	14.7	21.7
66	838 x 292 UB 226	226	850.9	293.8	16.1	26.8
67	914 x 305 UB 201	201	903.0	303.3	15.1	20.2
68	914 x 305 UB 224	224	910.1	304.1	15.9	23.9
69	914 x 305 UB 253	253	918.4	305.5	17.3	27.9
70	914 x 305 UB 289	289	926.6	307.7	19.5	32.0
71	914 x 419 UB 343	343	911.8	418.5	19.4	32.0
72	914 x 419 UB 388	388	921.0	420.5	21.4	36.6

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RSJ Beams - FAQs

Below are the most common questions sent to our team about RSJ beams.

What is an RSJ beam?
An RSJ beam (Rolled Steel Joist) is a steel beam designed to provide critical support in load-bearing structures, ensuring strength and stability.

These beams are crafted from high-strength steel and are available in various shapes, including:
- I-Beams: Shaped like a capital “I,” ideal for horizontal support in floors and ceilings.
- H-Beams: Featuring wider flanges for enhanced strength, perfect for heavy-duty structural applications.
- UB Beams Often synonymous with RSJs, these beams ensure even weight distribution in steel-framed buildings.
RSJ beams are engineered to withstand significant loads, making them essential for supporting walls, roofs, and floors in both residential and commercial construction projects.
What does RSJ stand for?

RSJ stands for Rolled Steel Joist. It refers to a type of steel beam commonly used in construction for structural support. Known for its strength and durability, RSJs are essential in load-bearing applications for both residential and commercial projects.
What is the difference between RSJ and universal beam?
RSJ (Rolled Steel Joist) and Universal Beam (UB) are terms often used interchangeably, but there are slight distinctions in terminology and usage. Here's how they compare:
- RSJ: A traditional term commonly used in the UK for steel beams.
- Universal Beam: The modern industry standard term for the same type of beam.
- Function: Both are designed for structural support in load-bearing construction projects.
How to measure an RSJ beam?
To measure an RSJ beam, you need to determine its key dimensions accurately. These include:
- Depth (Height): Measure the vertical distance from the top to the bottom of the beam.
- Flange Width: Measure the width of the top or bottom horizontal sections.
- Web Thickness: Measure the thickness of the vertical section connecting the flanges.
Always use precise tools and refer to manufacturer specifications for accurate measurements.
What size RSJ do I need for a 3m span?
The size of the RSJ beam required for a 3m span depends on the load it needs to support. As a general guideline:
- Light Loads: A 152mm x 89mm RSJ may suffice.
- Moderate Loads: A 203mm x 102mm RSJ is commonly used.
- Heavy Loads: Larger beams, such as 254mm x 146mm, may be necessary.
Always speak to a structural engineer to ensure the correct RSJ size for your specific project and safety requirements. Alternatively, you can speak to our specialist team who can advise on your exact requirements.
Do you need RSJ for bifold doors

Yes, an RSJ is typically required when installing bifold doors, especially if you're removing a load-bearing wall. The RSJ provides essential structural support to bear the weight of the building above the opening.
What size RSJ for a loft conversion?
The size of the RSJ for a loft conversion depends on the span, load, and structural requirements of your project. Common sizes include:
- 152mm x 89mm: Suitable for smaller spans and lighter loads.
- 203mm x 102mm: Ideal for moderate spans and loads.
- 254mm x 146mm: Used for larger spans or heavier structural demands.
Always consult a structural engineer to determine the exact RSJ size needed for your loft conversion.