A sling can look serviceable from a distance and still be unfit to lift a load. A cut hidden on the underside of a web sling, a stretched chain link, or a crushed wire rope section can change the capacity and behavior of the entire rigging arrangement. Knowing how to inspect lifting slings is therefore not a paperwork exercise. It is a direct control against dropped loads, equipment damage, lost production time, and injury.
For plant, warehouse, and site teams, sling inspection should be built into the lifting process rather than treated as a task completed only when an annual audit is due. The right approach combines a pre-use visual check, a documented periodic inspection, clear removal criteria, and a reliable way to replace or repair equipment that does not pass.
Start With Sling Identification and the Lift Plan
Before examining the sling itself, confirm that it is the correct item for the planned lift. Read the identification tag, label, or marking and verify its working load limit, sling type, length, material, and manufacturer information. If the tag is missing or unreadable, the sling should not be used. Capacity cannot be assumed from color, size, or appearance.
The working load limit must suit the actual configuration. A sling used in a basket hitch, choker hitch, or multi-leg arrangement may have a different rated capacity than it does in a straight vertical lift. Sling angle also matters. As the angle from vertical decreases, tension in each leg rises sharply. A sling that is adequate for a straight lift can be overloaded when used at a shallow angle.
Check that the sling, hooks, shackles, lifting beam, crane hook, and load attachment points form a compatible system. The capacity of the complete arrangement is limited by its weakest component. Sharp edges, hot surfaces, chemicals, and abrasive loads also need attention before the lift starts, because they may require corner protection or a different sling material.
How to Inspect Lifting Slings Before Use
A pre-use inspection should be conducted by the person handling the sling before each shift and before a lifting operation where conditions have changed. Lay the sling out where practical, clean away loose dirt or grease that could conceal damage, and inspect the full length. Do not inspect only the section that is easiest to see.
Use sight and touch. Run a gloved hand along the sling where safe to do so, feeling for cuts, broken wires, stiff sections, flattening, embedded debris, or changes in texture. Rotate fittings and hardware so that wear is not hidden behind the hook or attachment point. If there is any uncertainty about the sling’s condition, remove it from service until a competent person has assessed it.
Synthetic web and round slings
Synthetic slings are lightweight and versatile, but their fibers can be damaged by cutting, abrasion, heat, ultraviolet exposure, and chemical contact. Check webbing for holes, cuts, snags, broken stitching, frayed edges, melted or glazed fibers, and excessive wear. Pay close attention to load-bearing edges and areas that have passed over corners or through choker eyes.
For round slings, inspect the protective cover for cuts, tears, burns, and abrasion. The cover protects the internal load-bearing yarns, so damage that exposes the core is a reason to remove the sling from service. A round sling that feels unusually stiff, lumpy, or uneven may have internal damage even if the outer cover appears relatively intact.
Do not rely on a damaged sling cover to contain the load-bearing core. Temporary tape, knots, sewing, or makeshift sleeves are not acceptable repairs. Use properly selected edge protection during the lift, but do not treat protection as a way to keep a condemned sling in operation.
Wire rope slings
Wire rope slings require close inspection because damage may concentrate at bends, eyes, fittings, and areas in contact with sheaves or load edges. Look for broken wires, corrosion, kinks, crushing, birdcaging, flattening, heat damage, and sections with an altered rope diameter. A kink permanently distorts the rope structure and can significantly reduce strength.
Inspect the eyes, thimbles, ferrules, swaged sleeves, and mechanical splices for cracks, deformation, slippage, or severe wear. Check that hooks are secure and that any safety latch, where fitted, operates correctly. Lubrication can help preserve wire rope, but excessive grease may hide defects. Clean the area enough to make a proper judgment.
Alloy chain slings
Chain slings are durable in demanding industrial environments, but they are not immune to overload, heat exposure, corrosion, or impact. Examine every link for stretching, twisting, nicks, gouges, cracks, excessive wear, and signs of welding spatter. Compare suspect links with adjacent links. A distorted or elongated link can indicate overload or shock loading.
Inspect master links, coupling links, hooks, latches, and shortening devices. Hooks should not be bent, twisted, cracked, or excessively opened at the throat. A latch is not a load-bearing substitute for correct hook seating. The load must sit in the bowl of the hook, not on the tip or latch.
Chain slings should also be checked for unauthorized repairs. Field welding, heating, or straightening can alter the material properties of alloy lifting chain. Repairs and proof testing should be carried out only by qualified personnel using approved procedures.
Know When a Sling Must Be Removed From Service
The most dependable inspection programs make the decision simple: when a sling fails the acceptance criteria, quarantine it immediately. Attach a clear “Do Not Use” tag, remove it from the lifting area, and prevent it from being returned to circulation by mistake.
Common removal triggers include missing identification, visible cuts or broken stitching, exposed round-sling core, damaged wire rope, broken wires, kinks, corroded or distorted chain links, cracked fittings, bent hooks, damaged latches, evidence of heat or chemical attack, and any deformation caused by overloading. The manufacturer’s instructions and the applicable workplace requirements should define the exact rejection criteria for each sling type.
There is a practical trade-off here. Taking a sling out of service may delay a job, particularly where a specific length or capacity is needed. Continuing with an uncertain sling creates a far greater operational risk. Maintaining a controlled stock of commonly used sling types and locally available replacement parts helps teams make the safe decision without unnecessarily extending downtime.
Establish Formal Periodic Inspections
Pre-use checks catch obvious damage, but they do not replace periodic inspections by a designated competent person. The required interval depends on sling type, frequency of use, severity of service, environmental exposure, and company procedures. Slings used daily in abrasive, corrosive, outdoor, high-temperature, or high-cycle operations require closer attention than slings used occasionally in clean indoor conditions.
A periodic inspection should be documented with the sling identification, date, inspector, condition, defects found, and final disposition. A practical register makes it possible to track repeat failures, identify misuse patterns, and plan replacement purchasing before a shortage affects production.
Consider a color-coded inspection system only as a visual aid, not as proof of condition. A color tag may indicate the inspection period, but it cannot show whether the sling was damaged after that inspection. Every operator still needs to complete the pre-use check.
Inspect the Whole Lifting Arrangement
Slings do not fail in isolation. A serviceable sling can be damaged by a sharp load edge, an undersized shackle, a hook with a damaged latch, poor load balance, or side loading. During the inspection, assess the lifting points and confirm that the load is stable, the center of gravity is understood, and the sling will not be dragged across floors or trapped beneath a load.
Before raising the load fully, take up slack slowly and conduct a trial lift just clear of the supporting surface. Watch for shifting, slipping, unequal sling tension, or hardware that is not seated correctly. Stop and re-rig if anything appears abnormal. No inspection process can compensate for an incorrect lift setup.
Turn Inspection Into a Reliable Maintenance Practice
A dependable sling program needs more than inspection forms. It needs trained users, defined inspection responsibilities, labeled storage areas, protection from moisture and contaminants, and a straightforward quarantine process. Store slings off the floor, away from direct heat, welding activity, corrosive chemicals, and sharp materials. Good storage reduces hidden damage between lifts.
For operations with recurring lifts or specialized loads, an engineering review can help align sling selection, crane capacity, lifting points, and handling methods with the actual task. This is especially valuable when lifting equipment has been modified, loads have changed, or production layouts have introduced new constraints.
A disciplined inspection routine gives operators permission to stop a questionable lift before it becomes an incident. That small decision protects people, preserves equipment life, and keeps the material-handling system available for the work that matters.