ISLB – light beams

ISLB 75

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 = 50d = 75tf = 5tf = 5tw = 3.7tw = 3.7
Cross-section, to scaledimensions in mm

Dimensions

Depthd
75mm
Flange widthbf
50mm
Web thicknesstw
3.7mm
Flange thicknesstf
5mm
Root radiusr1
6.5mm
Toe radiusr2
2mm

Mass and area

Mass per lengthm
5.998kg/m
Cross-sectional areaA
764mm²
Published area (standard)A pub.
771mm²
Outside perimeterP
320mm

Strong axis x–x

Moment of inertiaIx
0.715810⁶ mm⁴
Elastic section modulusSx
19.0910³ mm³
Plastic section modulusZx
22.0610³ mm³
Radius of gyrationrx
30.61mm

Weak axis y–y

Moment of inertiaIy
0.0876210⁶ mm⁴
Elastic section modulusSy
3.50510³ mm³
Plastic section modulusZy
5.91110³ mm³
Radius of gyrationry
10.71mm

Equivalents in other standards