OSHA 1910.184: Sling Inspection, Removal Criteria & Penalties

OSHA 1910.184 sling requirements cover every sling used to hoist loads in general industry: alloy steel chain, wire rope, metal mesh, natural and synthetic fiber rope, and synthetic web (including roundslings).¹ For each type, the standard sets rules for identification markings, daily and periodic inspections, defect-based removal from service, temperature limits, safe operating practices, proof testing, and prohibited field repairs. The standard does not apply to slings used in construction or to slings that are part of an assembled crane or derrick.

Which Slings the Standard Covers

Five sling categories fall under 1910.184:¹

Alloy steel chain slings.
Wire rope slings, in fiber core or independent wire rope core (IWRC) construction.
Metal mesh slings.
Natural and synthetic fiber rope slings.
Synthetic web slings, including roundslings.

Each type has its own marking, inspection, temperature, and removal criteria. The rest of this article walks through those requirements in the order you would apply them on a working floor.

Identification and Marking

Every sling must carry permanent, legible identification before it goes into service. A sling with a missing, torn, or unreadable tag cannot be used until it is re-identified or replaced.¹ What has to appear on the tag depends on the sling:

Alloy steel chain: size, grade, rated capacity, and reach.
Wire rope: recommended safe working load for each hitch type, the angle the rating is based on, and the number of legs if more than one.
Metal mesh: rated capacity for vertical, basket, and choker hitch configurations.
Natural and synthetic fiber rope: rated capacity for each hitch type, the rating angle, fiber material, and leg count if multi-leg.
Synthetic web: rated capacities for each hitch type and the web material.

The tag is what lets the person selecting the sling match it to the load without guessing.

Inspection Requirements

Before Each Shift

A competent person designated by the employer must visually inspect every sling and all fastenings and attachments before use each day, for damage or defects.¹ Under OSHA’s definition, a competent person can identify existing and predictable hazards and has authority to remove equipment from service immediately.² If someone has to get a supervisor’s approval before tagging a bad sling out, they do not meet the definition.

Additional inspections are required during use if conditions suggest a sling may have been damaged, such as a hard impact or contact with a sharp edge.¹

Periodic Thorough Inspections

Alloy steel chain slings must receive a thorough inspection at intervals no greater than twelve months, with frequency within that window based on use, service severity, and lift type. The inspection looks for wear, defective welds, deformation, and stretching. Employers must record the most recent month each chain sling was thoroughly inspected and make the record available.¹

Alloy steel chain is the only sling type for which 1910.184 explicitly requires routine inspection records, but keeping similar logs for the other types is standard practice and helps in an OSHA inspection.

When a Sling Must Be Removed From Service

Any sling found damaged or defective must be pulled from service immediately and tagged or segregated so it cannot be grabbed by mistake. The specific triggers vary by material.

Alloy Steel Chain

Remove the sling if any link is worn below the manufacturer’s minimum size, stretched, or deformed, or if any part shows cracks, gouges, or defective welds. Makeshift links or fasteners from bolts or rods are prohibited, as are mechanical coupling links and low-carbon steel repair links.¹

Hooks on any sling type must come out of service if cracked, if the throat has opened more than 15 percent beyond normal at the narrowest point, or if the hook has twisted more than 10 degrees from its original plane.¹

Wire Rope

Retire a wire rope sling for any of the following:¹

Ten randomly distributed broken wires in one rope lay, or five broken wires in one strand within one rope lay.
Wear or scraping that has reduced the diameter of any outside wire by one-third or more.
Kinking, crushing, birdcaging, or other distortion of the rope structure.
Evidence of heat damage.
Cracked, deformed, or worn end attachments.
Corrosion of the rope or end attachments.

Fiber core wire rope slings exposed above 200°F must be permanently retired, not just re-inspected.¹

Metal Mesh

Retire a metal mesh sling for:³

A broken weld or brazed joint along the edge.
Wire diameter reduced by 25 percent from abrasion or 15 percent from corrosion.
Loss of flexibility from distorted mesh.
Handle distortion: female handle slot depth increased more than 10 percent; either handle eye width decreased more than 10 percent; cross-sectional area of metal around a handle eye reduced by 15 percent; or a handle bent out of its plane.

Metal mesh repairs must be documented in writing or by permanent marking on the sling, showing the date, the nature of the repair, and who performed it.¹

Synthetic Web and Roundslings

Remove a synthetic web sling for acid or caustic burns, melting or charring, cuts, holes, tears, snags, broken stitches, or damaged fittings. Nylon web slings cannot be used where acid or phenolic fumes, vapors, sprays, or liquids are present.¹ A roundsling comes out of service whenever damage exposes the core yarns, whether from holes, tears, cuts, abrasive wear, snags, or welding splatter, and also for broken or damaged core yarns even when the cover looks intact.⁴

Natural and Synthetic Fiber Rope

Retire fiber rope slings that show mildew, rotting, chemical discoloration, or internal fiber breakdown. Eye splices must have at least four full tucks, and the clear length between eye splices must be at least ten times the rope diameter. Knots cannot substitute for splices, and clamps not designed for fiber rope cannot be used for splicing.¹

One rule catches people off guard: fiber rope slings cannot be repaired or reconditioned at all. Only slings made from new rope may be used.¹

Rated Capacity, Angles, and Temperature

Sling Angles

Rated capacity assumes a specific angle between the sling leg and the load. As that angle decreases from vertical, tension in each leg increases and effective capacity drops. Wire rope, fiber rope, and synthetic web sling tags must show the angle their rating is based on.¹ If your tag lists a 60-degree rating and you rig at 45 degrees, you have exceeded rated capacity even if the load has not changed. Compare the tag’s angle to your actual geometry before every lift.

Wire rope slings lose additional capacity when bent around a small-diameter object. Industry practice calls for at least a 5-to-1 ratio between the pin or object diameter and the sling body diameter; bending around something narrower can cut effective capacity by 25 percent or more.

Temperature Limits

Operating a sling outside its temperature range without manufacturer guidance is a violation.¹

Fiber core wire rope: maximum 200°F. Must be permanently removed if exposed above that.
IWRC wire rope: maximum 400°F, with manufacturer consultation above that.
Nylon and polyester web: maximum 180°F.
Polypropylene web: maximum 200°F.³
Metal mesh (uncoated): -20°F to +550°F with no capacity reduction.
Metal mesh (PVC or neoprene coated): 0°F to +200°F.³

Wire rope slings, fiber core or IWRC, should not be used below -40°F.

Safe Operating Practices

Section 1910.184(c) sets operating rules that apply to every lift, regardless of sling type. Each is independently citable.¹

Never load a sling beyond its rated capacity.
Do not shorten a sling with knots, bolts, or improvised devices.
Sling legs must hang without twists or kinks.
Loads in a basket hitch must be balanced so they cannot slip.
The sling must be firmly attached to the load before the lift begins.
Pad or protect the sling wherever it contacts a sharp edge.
Keep suspended loads clear of obstructions.
Keep personnel clear of loads about to be lifted and away from hanging loads.
Never place hands or fingers between the sling and the load while tightening.
No shock loading, meaning no sudden jerks or drops that snap the sling taut.
Do not pull a sling out from under a load resting on it.

Proof Testing and Certificates

Proof testing loads a sling to twice its rated capacity to confirm it can handle its working load with a margin. Several sling types require it before service:¹

Alloy steel chain slings, whether new, repaired, or reconditioned, must be proof tested at twice their rated capacity by the manufacturer or an equivalent entity. The employer must keep the certificate on file and make it available for inspection.
Wire rope slings with welded end attachments must be proof tested at twice the rated capacity before first use, with the certificate retained by the employer.
Synthetic web slings repaired by the manufacturer must be proof tested at twice their rated capacity before returning to service.

If you cannot produce the certificate for a sling that requires one, expect an inspector to treat the sling as noncompliant. Keep these records with your sling documentation rather than in a purchasing file.

Prohibited Repairs and Modifications

The standard separates authorized repairs, done by the manufacturer or an equivalent entity, from field fixes. Across sling types:¹

No shortening with knots, bolts, or improvised devices on any sling.
No field-fabricated chain links or fasteners made from bolts or rods on alloy steel chain slings.
No knots substituting for splices on fiber rope slings, and no clamps unless designed for fiber rope.
No use of any synthetic web sling that has been temporarily repaired.
No repair or reconditioning of fiber rope slings, ever. New rope only.

For sling types that do allow repairs — alloy steel chain, wire rope, metal mesh, and synthetic web — the work must be performed by the manufacturer or an equivalent entity, and the repaired sling must be proof tested at twice its rated capacity before returning to service. A certified welder on your maintenance crew does not qualify.

Training

Section 1910.184 does not spell out a training requirement for sling users or inspectors. That silence does not make training optional. OSHA can cite employers under the General Duty Clause (Section 5(a)(1) of the OSH Act) for failing to train workers who handle rigging. In practice, document training for anyone designated as a competent person for sling inspections and for anyone who rigs or signals lifts, covering sling types, rated capacity interpretation, inspection criteria, and removal-from-service rules.

How ASME B30.9 Fits In

Slings are often marked to ASME B30.9, a voluntary consensus standard, rather than exactly as 1910.184 describes. OSHA treats this as a de minimis condition, meaning no citation is issued as long as the ASME markings provide at least the same safety information the federal rule requires. B30.9 is updated more frequently and generally goes further on design, inspection frequency, and newer sling technologies, so many employers use it as their internal baseline.

Penalties for Noncompliance

OSHA adjusts its maximum penalties for inflation each January. As of January 2025:⁵

Serious violation: up to $16,550 per violation.
Other-than-serious violation: up to $16,550 per violation.
Willful or repeat violation: up to $165,514 per violation.

Each defective sling in use, each missing inspection record, and each unmarked sling can be counted as a separate violation. A shop running a dozen uninspected chain slings is not looking at one citation but potentially twelve. Willful violations, where the employer knew of the hazard and did nothing, carry roughly ten times the penalty and can lead to criminal referral if a worker is killed. Current inspection records and prompt removal of damaged slings remain the cheapest form of compliance.

1
Occupational Safety and Health Administration. 1910.184 – Slings
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Occupational Safety and Health Administration. Clarification of Competent and Qualified Person, as it Relates to Subpart P
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GovInfo. 29 CFR 1910.184 – Slings
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Occupational Safety and Health Administration. Guidance on Safe Sling Use – Synthetic Round Slings
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U.S. Department of Labor / Occupational Safety and Health Administration. US Department of Labor announces adjusted OSHA civil penalty amounts for 2025