Lifting Lug Capacity Calculator
Screen net-section, shear-out and bearing limit states for a simple plate lug, with explicit dynamic and load-sharing assumptions.
“We cut a 20 mm plate lug for a two-tonne lift. Is the pin-hole region obviously inadequate?”
Lifting lug screening reference
F_lug = W × dynamic / n_lugs × sharingF_net = (b − d) t f / SFF_so = 2 e t τ / SFF_b = d t σ_b / SFSingle plate lug
Lift and simple plate geometry
This is deliberately a narrow screening model, not a lifting-device design.
Plate-lug screening
Bearing
This is not enough to approve a lift. The result only means these three simplified checks did not govern under the assumptions entered.
Not checked: welds, pin bending, plate bending, out-of-plane loading, lug eccentricity, local contact, combined stresses, fatigue, sling hardware, proof testing, lift points on the parent equipment, centre of gravity or lift planning.
Generic stress-based screening of net section, two-plane shear-out and projected bearing only. It does not claim compliance with AS 4991 or any other lifting standard.
Save the calculation, not just the number.
Copy a permalink that reloads these inputs, or download a PDF record with inputs, visible results, assumptions, a sensitivity note, date and disclaimer.
A calculator can show the arithmetic. It cannot establish every requirement that applies.
Confirm the actual equipment, loading, materials, condition, jurisdiction, contractual requirements, standard edition and current project documentation before using the result for design, repair, testing or lifting decisions.
Ask an engineer about this calculation →