When Should a Lifting Chain Be Removed from Service?

Definitive discard guide for lifting chains under EN 818-6 and ASME B30.9: evaluating 10% wear limits, 5% pitch elongation, arc strikes, hook deformation, and disposal protocols.

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In overhead lifting and industrial rigging, the decision to remove a lifting chain from service is an absolute safety mandate. A compromised chain link does not offer warning signs like a synthetic sling that visibly frays before snapping; high-tensile alloy steel can fail instantaneously under load once localized wear, stretch, or fatigue cracks cross critical thresholds. Knowing precisely when to condemn a chain sling is the defining responsibility of riggers, safety superintendents, and certified lifting equipment inspectors. Governed by international standards such as **EN 818-6**, **ASME B30.9**, and **ISO 3056**, discard criteria are definitive and non-negotiable. If a lifting chain exhibits any single disqualifying defect outlined in statutory safety codes, it must be immediately removed from service, quarantined, and condemned. Field attempts to weld, straighten, or locally modify condemned chain links are strictly illegal and create extreme liability. ## The Top Five Discard Criteria Mandating Immediate Removal A comprehensive examination must result in immediate condemnation if any of the following five conditions are observed: ### 1. Inter-Link Wear Exceeding 10% Continuous friction at link articulation points reduces the cross-sectional area of the steel. - Using precision vernier calipers, measure the diameter at the worn contact point. - **The Rule:** If the average worn diameter has decreased by **more than 10%** of the original nominal diameter ($d$), the ...