Lifting Lug Calculator
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1
1. Design Load
Design code
Load distribution
Equal split
2-lug asymmetric (COG offset)
Manual per-lug load
Total weight
kN
Number of lifting lugs
Lug span (L)
mm
COG offset from center
mm
Lug load (manual)
kN
Sling angle from vertical
°
0° = vertical sling.
Dynamic factor
K
Typical 1.1 – 1.65.
2
2. Ear Plate Strength
Material
Q235
Q345
Q355 / S355
A36
Custom
Yield strength σs
MPa
Pin diameter
mm
Plate thickness
mm
Plate width (B)
mm
Edge distance (c)
mm
Hole center to plate end along load.
Eccentricity to weld (e)
mm
Hole center to weld line; causes bending.
Safety factor
Tensile / bending allowable = σs / SF.
Geometry
3
3. Weld Strength
Weld type
Fillet weld
Full-penetration butt
Partial penetration
Weld leg size (a)
mm
Penetration depth (p)
mm
Weld electrode
E43 (fw=160)
E50 (fw=200)
E55 (fw=220)
Custom
Weld metal strength fw
MPa
Weld length (L)
mm
Weld safety factor
Calculate
Design mode (solve size)
Solve required thickness
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Results
Enter parameters and click Calculate.
Theory & References