FLT Steel – Flat Section

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FLT Steel – Flat Section

FLT steel are used anywhere where a connection between two beams is required. They are used for base plates, end plates, stiffeners, gussets, tabs, splice plates and many more. In some cases, they add strength to a steel beam when welded along the length of a beam (top or bottom).

Flat Sections are described by their width and thickness, eg. 200 x 12 Flat (both in mm). When a flat section is cut into smaller pieces, then they are called “plates”. Sometimes Flat Sections are used to reinforce timber joists (“flitch beam”) by bolting it to the joist every 400 – 600 mm.

FLT Steel (Size & Weight Chart)

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No FLT – Flat Section Type Weight [kg/m] Width [mm] Thickness [mm]
01 40 x 3 flat 0.9 40 3
02 40 x 5 flat 1.6 40 5
03 40 x 6 flat 1.9 40 6
04 40 x 8 flat 2.5 40 8
05 40 x 10 flat 3.1 40 10
06 40 x 12 flat 3.8 40 12
07 40 x 15 flat 4.7 40 15
08 40 x 20 flat 6.3 40 20
09 40 x 25 flat 7.9 40 25
10 40 x 30 flat 9.4 40 30
11 45 x 3 flat 1.1 45 3
12 45 x 5 flat 1.8 45 5
13 45 x 6 flat 2.1 45 6
14 45 x 8 flat 2.8 45 8
15 45 x 10 flat 3.5 45 10
16 45 x 12 flat 4.2 45 12
17 45 x 15 flat 5.3 45 15
18 45 x 20 flat 7.1 45 20
19 45 x 25 flat 8.8 45 25
20 50 x 3 flat 1.2 50 3
21 50 x 5 flat 2.0 50 5
22 50 x 6 flat 2.4 50 6
23 50 x 8 flat 3.1 50 8
24 50 x 10 flat 3.9 50 10
25 50 x 12 flat 4.7 50 12
26 50 x 15 flat 5.9 50 15
27 50 x 20 flat 7.9 50 20
28 50 x 25 flat 9.8 50 25
29 50 x 30 flat 11.8 50 30
30 50 x 40 flat 15.7 50 40
31 60 x 5 flat 2.4 60 5
32 60 x 6 flat 2.8 60 6
33 60 x 8 flat 3.8 60 8
34 60 x 10 flat 4.7 60 10
35 60 x 12 flat 5.7 60 12
36 60 x 15 flat 7.1 60 15
37 60 x 20 flat 9.4 60 20
38 60 x 25 flat 11.8 60 25
39 60 x 30 flat 14.1 60 30
40 65 x 5 flat 2.6 65 5
41 65 x 6 flat 3.1 65 6
42 65 x 8 flat 4.1 65 8
43 65 x 10 flat 5.1 65 10
44 65 x 12 flat 6.1 65 12
45 65 x 15 flat 7.7 65 15
46 65 x 20 flat 10.2 65 20
47 65 x 25 flat 12.8 65 25
48 65 x 40 flat 20.4 65 40
49 65 x 50 flat 25.5 65 50
50 70 x 6 flat 3.3 70 6
51 70 x 8 flat 4.4 70 8
52 70 x 10 flat 5.5 70 10
53 70 x 12 flat 6.6 70 12
54 70 x 15 flat 8.2 70 15
55 70 x 20 flat 11.0 70 20
56 70 x 25 flat 13.7 70 25
57 70 x 30 flat 16.5 70 30
58 70 x 40 flat 22.0 70 40
59 75 x 6 flat 3.5 75 6
60 75 x 8 flat 4.7 75 8
61 75 x 10 flat 5.9 75 10
62 75 x 12 flat 7.1 75 12
63 75 x 15 flat 8.8 75 15
64 75 x 20 flat 11.8 75 20
65 75 x 25 flat 14.7 75 25
66 80 x 3 flat 1.9 80 3
67 80 x 5 flat 3.1 80 5
68 80 x 6 flat 3.8 80 6
69 80 x 8 flat 5.0 80 8
70 80 x 10 flat 6.3 80 10
71 80 x 12 flat 7.5 80 12
72 80 x 15 flat 9.4 80 15
73 80 x 20 flat 12.6 80 20
74 80 x 25 flat 15.7 80 25
75 80 x 30 flat 18.8 80 30
76 80 x 50 flat 31.4 80 50
77 90 x 5 flat 3.5 90 5
78 90 x 6 flat 4.2 90 6
79 90 x 8 flat 5.7 90 8
80 90 x 10 flat 7.1 90 10
81 90 x 12 flat 8.5 90 12
82 90 x 15 flat 10.6 90 15
83 90 x 20 flat 14.1 90 20
84 90 x 25 flat 17.7 90 25
85 90 x 30 flat 21.2 90 30
86 100 x 3 flat 2.4 100 3
87 100 x 5 flat 3.9 100 5
88 100 x 6 flat 4.7 100 6
89 100 x 8 flat 6.3 100 8
90 100 x 10 flat 7.9 100 10
91 100 x 12 flat 9.4 100 12
92 100 x 15 flat 11.8 100 15
93 100 x 20 flat 15.7 100 20
94 100 x 25 flat 19.6 100 25
95 100 x 30 flat 23.6 100 30
96 100 x 40 flat 31.4 100 40
97 100 x 50 flat 39.3 100 50
98 110 x 6 flat 5.2 110 6
99 110 x 8 flat 6.9 110 8
100 110 x 10 flat 8.6 110 10
101 110 x 12 flat 10.4 110 12
102 110 x 15 flat 13.0 110 15
103 110 x 20 flat 17.3 110 20
104 110 x 25 flat 21.6 110 25
105 120 x 6 flat 5.7 120 6
106 120 x 8 flat 7.5 120 8
107 120 x 10 flat 9.4 120 10
108 120 x 12 flat 11.3 120 12
109 120 x 15 flat 14.1 120 15
110 120 x 20 flat 18.8 120 20
111 120 x 25 flat 23.6 120 25
112 130 x 5 flat 5.1 130 5
113 130 x 6 flat 6.1 130 6
114 130 x 8 flat 8.2 130 8
115 130 x 10 flat 10.2 130 10
116 130 x 12 flat 12.3 130 12
117 130 x 15 flat 15.3 130 15
118 130 x 20 flat 20.4 130 20
119 130 x 25 flat 25.5 130 25
120 130 x 30 flat 30.6 130 30
121 140 x 6 flat 6.6 140 6
122 140 x 12 flat 13.2 140 12
123 140 x 15 flat 16.5 140 15
124 140 x 25 flat 27.5 140 25
125 150 x 5 flat 5.9 150 5
126 150 x 6 flat 7.1 150 6
127 150 x 8 flat 9.4 150 8
128 150 x 10 flat 11.8 150 10
129 150 x 12 flat 14.1 150 12
130 150 x 15 flat 17.7 150 15
131 150 x 20 flat 23.6 150 20
132 150 x 25 flat 29.4 150 25
133 150 x 30 flat 35.3 150 30
134 150 x 40 flat 47.1 150 40
135 180 x 6 flat 8.5 180 6
136 180 x 8 flat 11.3 180 8
137 180 x 10 flat 14.1 180 10
138 180 x 12 flat 17.0 180 12
139 180 x 15 flat 21.2 180 15
140 180 x 20 flat 28.3 180 20
141 180 x 25 flat 35.3 180 25
142 200 x 6 flat 9.4 200 6
143 200 x 8 flat 12.6 200 8
144 200 x 10 flat 15.7 200 10
145 200 x 12 flat 18.8 200 12
146 200 x 15 flat 23.6 200 15
147 200 x 20 flat 31.4 200 20
148 200 x 25 flat 39.3 200 25
149 220 x 5 flat 8.6 220 5
150 220 x 6 flat 10.4 220 6
151 220 x 8 flat 13.8 220 8
152 220 x 10 flat 17.3 220 10
153 220 x 12 flat 20.7 220 12
154 220 x 15 flat 25.9 220 15
155 220 x 20 flat 34.5 220 20
156 220 x 25 flat 43.2 220 25
157 230 x 10 flat 18.1 230 10
158 230 x 15 flat 27.1 230 15
159 230 x 20 flat 36.1 230 20
160 230 x 25 flat 45.1 230 25
161 250 x 6 flat 11.8 250 6
162 250 x 8 flat 15.7 250 8
163 250 x 10 flat 19.6 250 10
164 250 x 12 flat 23.6 250 12
165 250 x 15 flat 29.4 250 15
166 250 x 20 flat 39.3 250 20
167 250 x 25 flat 49.1 250 25
168 300 x 6 flat 14.1 300 6
169 300 x 8 flat 18.8 300 8
170 300 x 10 flat 23.6 300 10
171 300 x 12 flat 28.3 300 12
172 300 x 15 flat 35.3 300 15
173 300 x 20 flat 47.1
174 300 x 25 flat 58.9 300 25
175 350 x 10 flat 27.5 350 10
176 350 x 12 flat 33.0 350 12
177 350 x 15 flat 41.2 350 15
178 350 x 20 flat 55.0 350 20
179 350 x 25 flat 68.7 350 25
180 400 x 10 flat 31.4 400 10
181 400 x 12 flat 37.7 400 12
182 400 x 15 flat 47.1 400 15
183 400 x 20 flat 62.8 400 20
184 400 x 25 flat 78.5 400 25
185 450 x 20 flat 70.7 450 20
186 450 x 25 flat 88.3 450 25

Our Hassle Free and Simple 4 Step Process

Free FLT flat section quotation

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Planning and design process

Work with our skilled team to refine your plans, ensuring your steel components are engineered for precision and maximum efficiency.
 
 

Bespoke flat section production

Your FLY components are custom-fabricated to the highest standards, guaranteeing quality and accuracy for your construction project.
 

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Parallel Flange Channel – FAQs

What does RHS stand for in steel ?

RHS stands for Rectangular Hollow Section, a type of structural steel with a rectangular cross-section. This design offers greater flexibility for load distribution, making it suitable for beams, columns, and bracing applications.

RHS steel is widely used in construction due to its excellent strength-to-weight ratio and ease of fabrication. Its rectangular profile is particularly advantageous for structures requiring high stability and efficient space utilisation.

RHS steel is widely used in construction for its strength, versatility, and efficient design. Common applications include beams, columns, and bracing in structural frameworks, where its rectangular shape provides excellent load distribution and stability.

Rectangular Hollow Sections are measured by their external width, height, wall thickness, and length. The rectangular profile requires precise measurement of both width and height, recorded in millimetres, along with wall thickness for accurate specifications. Tools like callipers or tape measures are commonly used to ensure precision.

For a comprehensive overview of sizes and weights, refer to the RHS dimension table available on this page. This resource provides detailed insights to help you select the right specifications for your construction project.

To calculate a Rectangular Hollow Section (RHS), measure its external width, height, and wall thickness, all in millimetres. These values are essential for determining the cross-sectional area and weight, which are critical for structural analysis in construction projects.

For precise calculations, you can apply standard formulas to assess additional properties such as bending strength or moment of inertia. These measurements ensure the RHS meets the specific demands of your project and supports accurate planning.