ISLB – light beams

ISLB 400

Standard: IS 808:2021Source: IS 808:2021 dimensions (BIS) — calculated properties, flange slope 98° (8°)
Tapered-flange sections; flange thickness measured at the quarter of the flange.
xybf = 165d = 400tf = 12.5tf = 12.5tw = 8tw = 8
Cross-section, to scaledimensions in mm

Dimensions

Depthd
400mm
Flange widthbf
165mm
Web thicknesstw
8mm
Flange thicknesstf
12.5mm
Root radiusr1
16mm
Toe radiusr2
8mm

Mass and area

Mass per lengthm
56.86kg/m
Cross-sectional areaA
7,243mm²
Published area (standard)A pub.
7,240mm²
Outside perimeterP
1,373mm

Strong axis x–x

Moment of inertiaIx
19310⁶ mm⁴
Elastic section modulusSx
965.210³ mm³
Plastic section modulusZx
1,09910³ mm³
Radius of gyrationrx
163.3mm

Weak axis y–y

Moment of inertiaIy
7.16610⁶ mm⁴
Elastic section modulusSy
86.8510³ mm³
Plastic section modulusZy
151.410³ mm³
Radius of gyrationry
31.45mm

Equivalents in other standards