Common Rigging Problems and How to Identify Them

Bad rigging does not announce itself. A wire rope sling with a few broken wires, a shackle with a slightly opened body, or a synthetic sling with a faint chemical stain, these rigging problems sit in plain sight on job sites every day. Left unaddressed, any one of them can easily lead to a dropped load, costly downtime, or a serious injury.

The most common rigging problems across slings, hardware, and connections, along with exactly what you should look for during routine rigging equipment inspections. Selecting the right sling type for lifting or for guidance on that, see our guide on choosing the right lifting sling.

Safety Note : This article is for an educational overview and a quick checklist only. Equipment selection and retirement decisions must always follow the sling tag, manufacturer charts, and your site-specific rigging procedures.

Why Bad Rigging Goes Unnoticed

Gradual Wear vs. Sudden Failure

Most rigging failures are not the result of a single, dramatic overloading event. Instead, they are the endpoint of gradual wear that accumulates over weeks, months, or years of service. A chain link stretches incrementally. Wire rope slings lose individual wires one at a time. Synthetic webbing thins out imperceptibly from repeated abrasion across rough load edges. Because these physical changes happen so slowly, the equipment can look completely serviceable to a passing glance even when it is dangerously close to the end of its useful life.

The Role of Routine Inspection

Rigging inspection is the only mechanism that catches what a casual look misses. Both OSHA and ASME standards establish strict inspection requirements at multiple intervals: before each use, during use when conditions warrant, and at documented periodic intervals.

A daily pre-use visual check catches obvious, acute damage, while a periodic documented inspection involves a much more thorough, hands-on evaluation against specific removal-from-service criteria.

Sling-Related Rigging Problems

Slings are in direct contact with the load, making them highly susceptible to wear, abrasion, chemical exposure, and heat damage. Holloway manufactures alloy chain slings, synthetic web slings, and polyester round slings at our Houston facility, and we stock wire rope slings from leading producers. The issues outlined below are among the most common reasons slings come back to our shop for replacement.

Wire Rope Sling Damage (Broken Wires, Kinking, Corrosion)

Wire rope slings deteriorate in ways that are sometimes visible on the surface and sometimes hidden deep within the rope structure.

• Broken Wires : This is the most recognized indicator of wire rope fatigue. OSHA 29 CFR 1910.184(f)(5) identifies specific thresholds for removal: ten randomly distributed broken wires in one rope lay, or five broken wires in one strand in one rope lay. ASME B30.9-2021 mirrors these exact numbers for standard strand-laid slings.
• Kinking and Birdcaging : These deformations indicate permanent structural damage to the rope, typically resulting from shock loading or being pulled through a tight radius. A kinked rope cannot be safely straightened back into serviceable condition.
• Corrosion : While rust on the external wires is the visible sign, severe corrosion often progresses much faster in the rope's core where moisture and grit get trapped.
• Diameter Reduction : Repeated use and bearing heavy loads on sharp edges gradually reduces the rope's overall diameter, compromising its minimum breaking strength.
• Heat Discoloration : Exposure to a welding arc or torch cutting may show temper colors (a blue or straw tint). Heat permanently alters the steel's metallurgy and severely reduces its strength.

Note: Wire rope sling damage becomes exceptionally critical at low angles from horizontal. See our guide on wire rope sling angles and capacity to understand how angle affects the tension on each sling leg.

Chain Sling Wear (Stretch, Gouging, Link Distortion)

Alloy chain slings are among the most durable sling types available, but they are not immune to damage in brutal environments.

• Stretch and Elongation : Chain links gradually elongate under repeated loading. ASME B30.9 calls for immediate removal when any individual link has elongated more than 5%. Furthermore, NACM specifications state that removal is warranted when wear has reduced the link's cross-sectional diameter by 10% or more. Stretch is often easiest to catch by measuring the overall sling reach against the dimension stamped on the tag.
• Gouging and Nicking : Chain that is dragged across concrete or pinched in a connection point often develops deep gouges on the link bearing surfaces. These gouges create stress concentrations that significantly weaken the link under tension.
• Link Distortion : Bent, twisted, or deformed links indicate severe side-loading, impact, or overloading. Distorted links bind or hang at odd angles relative to adjacent links. A chain sling that does not articulate freely through its entire length warrants closer evaluation.
• Heat Damage : OSHA 29 CFR 1910.184(e)(9) establishes that alloy steel chain slings exposed to temperatures above 1,000°F must be permanently removed from service. Even below that threshold, heat discoloration, weld spatter, or arc strikes warrant a qualified evaluation.

Synthetic Sling Degradation (Cuts, UV Damage, Chemical Exposure)

Synthetic web slings and round slings are lightweight, highly flexible, and load-friendly, but they are significantly more vulnerable to environmental hazards than metal slings.

• Cuts, Snags, and Abrasion : OSHA 29 CFR 1910.184(i)(9) explicitly lists snags, punctures, tears, and cuts as mandatory removal conditions. WSTDA WS-1 adds that embedded materials also require removal. For round slings, any damage exposing the internal load-bearing core yarns is an immediate removal condition per WSTDA RS-1.
• Chemical Exposure : Acid or caustic burns are strict removal triggers in both OSHA and WSTDA standards. Nylon webbing is particularly sensitive to acids, while polyester is rapidly degraded by alkalis. Chemical damage may appear as strange discoloration, stiffened areas, or a crumbly, chalky texture.
• UV Degradation : Prolonged sun exposure degrades all synthetic fibers. WSTDA notes that sling manufacturers should be consulted for retirement criteria related to long-term UV exposure. Riggers must look for severe fading, surface brittleness, or a chalky feel as indicators of sun rot.
• Melting, Charring, and Weld Spatter : Any visual evidence of thermal damage on a synthetic sling is a removal condition under OSHA and WSTDA standards. Synthetic fibers lose their tensile strength at temperatures well below their actual melting point.
• Broken or Worn Stitching : WSTDA RS-1 specifies that broken stitching exposing the core yarn in a round sling is a removal condition. For flat web slings, OSHA 1910.184(i)(9) includes broken or heavily worn load-bearing stitches in its removal list.

Hardware-Related Rigging Problems

Rigging hardware such as shackles, hooks, and associated components connects the slings to the loads and to the crane hook. Holloway provides rigging hardware, and the following problems are what we see most often.

Shackle Deformation and Pin Wear

Shackles are exclusively designed to be loaded in a straight pull along the pin and through the bow. When they are side-loaded, shock-loaded, or overloaded, the body begins to warp and deform.

ASME B30.26 establishes clear removal criteria for shackles:

• Missing or illegible manufacturer markings or rated load identification.
• Indications of heat damage, including weld spatter or arc strikes.
• Excessive pitting or aggressive corrosion.
• Bent, twisted, distorted, stretched, elongated, cracked, or broken load-bearing components.
• Excessive nicks or deep gouges.
• A 10% reduction of the original or catalog dimension at any point around the body or pin.
• Incomplete pin engagement.
• Excessive thread damage on threaded pins.

Pin wear is a frequently overlooked issue. Pins that have worn flat on one side, developed deep grooves, or no longer thread smoothly into the shackle body indicate prolonged service under heavy load. For a deeper dive into inspection, see our shackle inspection guide.

Hook Throat Opening and Latch Failure

Hooks gradually open and warp under repeated heavy loading. ASME B30.10 sets the definitive threshold: any increase in throat opening exceeding 5% (not to exceed 1/4 inch or 6 mm) is a mandatory removal condition.

Additional hook removal conditions per ASME B30.10 include:

• Wear exceeding 10% of the original section dimension of the hook or its load pin.
• Any visible bend or twist from the plane of the unbent hook.
• Cracks, nicks, or gouges.
• Evidence of heat damage.

Latch failure is another persistent problem. A missing, bent, or inoperative safety latch eliminates the secondary retention that keeps the sling from accidentally slipping out of the hook bowl during slack handling. Industry best practice calls for latch functions to be physically verified as part of every single pre-use check.

Worn or Missing Identification Tags

Identification tags and markings are the primary way a rigger confirms a piece of equipment's rated capacity and traceability. OSHA 29 CFR 1926.251 requires permanently affixed, legible identification markings indicating the recommended safe working load. ASME B30.26 lists missing or illegible markings as a removal condition for rigging hardware, and ASME B30.9 applies the exact same standard to slings.

Tags routinely get torn off by rough handling, worn illegible by dragging abrasion, or corroded beyond readability. When a sling or fitting has no readable identification, it must be removed from service until identification can be re-established by the manufacturer or a qualified person.

Connection and Configuration Issues

Even when slings and rigging hardware are structurally sound, incorrect connection or configuration can create serious hazards. Many lifting failures are not caused by damaged equipment but by how that equipment is arranged under load.

Improper Sling Angle (From Horizontal)

Sling angle has a direct impact on tension. As the angle from horizontal becomes smaller, the force carried by each sling leg rises dramatically. Very shallow angles can multiply tension to dangerous levels, even when the load weight seems acceptable. Industry practice strongly discourages sling angles below 30° from horizontal. Warning signs include sling legs stretched wide apart, hardware being pulled sideways, or slings appearing nearly horizontal rather than vertical.

Mismatched Components

Using rigging components that differ in capacity, design, or compatibility weakens the entire system. A high-capacity sling paired with an underrated shackle, mixed measurement standards, or improperly sized pins can create hidden overload risks. The safe working capacity of any rigging assembly is always limited by its weakest component, regardless of the ratings of the others.

Point Loading and Edge Damage

Point loading happens when a sling bears against a narrow edge or sharp corner instead of a broad, smooth surface. This concentrates force into a small area and can quickly damage or cut the sling. Synthetic web and round slings are especially vulnerable. Warning indicators include visible cuts or wear at contact points, crushed or displaced edge protection, and sharp or abrasive load surfaces.

Building an Inspection Awareness Program

Rigging inspection is not a single step but an ongoing process that begins before every lift and continues through scheduled evaluations.

Inspection Requirements Under Safety Standards

Regulatory frameworks from OSHA and ASME define structured inspection levels :

• Pre-use inspections must be completed daily or at the start of each shift by a competent person.
• In-service inspections may be required during operation if conditions justify closer monitoring.
• Periodic documented inspections must occur at intervals not exceeding 12 months, with more frequent checks for severe service environments.

Standards from WSTDA align with these annual maximum inspection intervals for slings and related hardware.

Pre-Use Visual Checks

These quick checks occur before equipment enters service. Inspectors look for cuts, tears, severe abrasion, broken wires, stretched chain links, cracked hardware, missing tags, or faulty safety latches. The goal is a clear go/no-go decision. Any questionable item is removed from service immediately.

Periodic Documented Inspections

Periodic inspections are more detailed and formally recorded. They involve measurement against manufacturer specifications, evaluation of removal-from-service criteria, and written documentation of findings. This record confirms what was inspected, what issues were found, and whether the equipment remains approved for use.

Frequently Asked Questions

Q: How often should rigging equipment be inspected?

A: Daily pre-use inspections are required before operation. In addition, periodic documented inspections must occur at least annually, with shorter intervals recommended for heavy use or harsh environments.

Q: What are common signs of sling wear or damage?

A: Indicators vary by sling type. Wire rope slings may show broken wires or kinks. Chain slings may stretch or show link deformation. Synthetic slings may display cuts, burns, abrasion, or chemical damage. Missing identification tags are also removal criteria.

Q: When should a shackle be removed from service?

A: Remove shackles showing cracks, bending, corrosion, heat damage, excessive wear, or incomplete pin engagement. Any structural defect requires removal until evaluated by a qualified person.

Q: What is the difference between pre-use and periodic inspections?

A: Pre-use inspections are quick visual checks performed before operation. Periodic inspections are detailed, documented evaluations performed at scheduled intervals by trained personnel.

Q: Who is qualified to inspect rigging equipment?

A: A competent person performs daily checks. A designated or qualified individual with training and experience performs periodic documented inspections.

Q: What should I do if damaged equipment is found?

A: Remove it from service immediately, tag it clearly, and isolate it from usable equipment. A qualified person must evaluate it before repair, recertification, or disposal.

Shop Replacement Rigging Equipment at Holloway Houston

Holloway Houston has been manufacturing and supplying top-tier rigging equipment from our Houston facility for over 40 years. When worn or damaged gear fails an inspection and needs immediate replacement, all of the items below are available for purchase online:

• Slings manufactured by Holloway : Chain Slings, Round Slings, and Web Slings.
• Wire rope slings stocked by Holloway : Wire Rope Slings
• Hardware stocked by Holloway : Shackles, Hooks, and a full range of Rigging Equipment.

Need help selecting replacement rigging equipment? Request a quote or call our expert team at (713) 675-3900.