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ISLB 400

Light Beam50.4 kg/m

Indian Standard Light Beam — IS 808:2021 | Depth 400mm × Width 165mm

Cross-Section (mm)
400165tw=7.8tf=12.4
Weight Calculator
50.4 kg/m × 6m × 1 =
302.4kg
0.302tonnes
Section Properties
Depth (D)400 mm
Width (B)165 mm
Web Thickness (tw)7.8 mm
Flange Thickness (tf)12.4 mm
Weight per Metre50.4 kg/m
Cross-sectional Area64.24 cm²
Moment of Inertia (Ixx)21934.6 cm⁴
Moment of Inertia (Iyy)727.6 cm⁴
Section Modulus (Zxx)1096.7 cm³
Section Modulus (Zyy)88.2 cm³
Radius of Gyration (rxx)18.47 cm
Radius of Gyration (ryy)3.36 cm
Related Sections
ISLB 350
350mm × 165mm · 44.2 kg/m
Ixx 15099.7 cm⁴ · Zxx 862.8 cm³
ISLB 450
450mm × 170mm · 58 kg/m
Ixx 30390.8 cm⁴ · Zxx 1350.7 cm³
Applicable IS Codes
IS 808:2021 — Hot Rolled Structural Steel SectionsIS 2062:2011 — Hot Rolled Structural SteelIS 800:2007 — General Construction in Steel
Frequently Asked Questions
Q.What is the weight of ISLB 400 per metre?

ISLB 400 weighs 50.4 kg per metre as per IS 808. For a standard 6m length, the total weight would be 302.4 kg.

Q.What are the dimensions of ISLB 400?

ISLB 400 has a depth of 400mm, flange width of 165mm, web thickness of 7.8mm, and flange thickness of 12.4mm.

Q.What is the moment of inertia of ISLB 400?

The moment of inertia of ISLB 400 is Ixx = 21934.6 cm⁴ (major axis) and Iyy = 727.6 cm⁴ (minor axis).

Q.When should I use ISLB 400?

ISLB 400 (Light Beam) is typically used for secondary beams, light-duty beams, and window/door lintels. It provides a section modulus of Zxx = 1096.7 cm³, suitable for beams with moderate bending requirements.

Q.How much does a 6 metre ISLB 400 weigh?

A 6m length of ISLB 400 weighs 302.4 kg (0.302 tonnes). Weight formula: 50.4 kg/m × 6m = 302.4 kg.

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