Wire Rope Sling Inspection Checklist (SS 343): Testing & Replacement Criteria in Singapore
September 04, 2026 A Complete Guide to Wire Rope Sling Inspection, Testing, and Replacement Criteria (SS 343 / Singapore)
Answer (quick rule of thumb): If the sling tag is missing/illegible, remove the sling from service immediately and quarantine it.
If you see kinks, crushing, birdcaging, severe corrosion, heat damage, or broken wires beyond SS 343 limits, do not use the sling.
Wire rope slings are engineered to handle heavy lifting, but they still depend on disciplined inspection and correct disposal rules. Most unsafe conditions are visible first—broken wires, kinks, crushing, birdcaging, corrosion, or damaged end fittings—and the risk rises quickly when defects are ignored or “pushed for one more lift.”
This guide combines a practical site inspection workflow (before each lift) with the statutory inspection and testing framework referenced in Singapore practice, including SS 343 removal criteria and MOM guidance (MOM/OSHD/2025-05).
Reference link suggestions:
- Steel Wire Rope Sling Assembly - ROPECO®
- STL Testing and Certification / Re-Certification
- Test and Examination Requirements for Statutory Lifting Equipment (MOM/OSHD/2025-05))
1) Statutory inspection & testing requirements (MOM guidance)
Based on the referenced guidance, the key inspection/testing expectations include the following.
Initial testing before use
Before lifting gear is registered and put into service, it must undergo visual examination, functional test, and load test conducted by an Authorised Examiner (AE).
Periodic re-examinations
For standard lifting gear (including wire rope slings), periodic re-examinations must be conducted at least every 12 months by an Authorised Examiner or an appointed Competent Person.
Who can conduct periodic inspections (Competent Person)
Workplace occupiers may appoint Competent Persons for routine periodic lifting gear re-examinations, including:
- SAC-accredited inspection bodies
- Manufacturer representatives
- Trained/qualified in-house inspectors appointed by the workplace occupier
When proof load testing is required again
Periodic overload tests after initial registration are not mandatory unless the gear undergoes major repairs, modifications, re-assembly, or an increase in SWL. Proof load/destructive testing may also be required for cases such as pre-registration or after major repairs.
Test Requirements for Statutory Lifting Equipment Table (extracted from MOM circular ref: MOM/OSHD/2025-05))
2) Practical pre-use & site inspection workflow (before every lift)
Even with formal re-examinations, your highest-frequency safety control is the operator’s pre-use check. A consistent routine reduces misses.
The “30-second scan” (fast but structured)
- Verify identification
- Confirm the sling tag is present and legible, and shows key details such as WLL and trace identification.
- Scan the full rope length
- Do a visual scan and (where safe) a gloved-hand pass to feel for lumps, flat spots, or sudden diameter changes.
- Inspect end terminations and hardware
- Examine eyes, thimbles, ferrules/sleeves and hooks for distortion, wear, cracking, or signs of movement/slippage.
If anything looks wrong, STOP! Don’t “test it with a lift.” Quarantine and escalate for assessment.
3) What to look for: common wire rope sling defects (field recognition)
These are the defect patterns your team should be able to recognize quickly.
Broken wires (fatigue indicator)
Broken wires can indicate fatigue and accelerating deterioration. Pay special attention near high-stress zones like:
- Near end terminations
- Around hooks/thimbles
- Repeated bend points
Kinking, crushing, and birdcaging (structural distortion)
Kinks, crushing, and birdcaging permanently alter the rope’s internal structure and should be treated as non-repairable conditions for a sling.
Abrasion and heat damage
Severe localized abrasion/scraping and heat damage are removal triggers. Abrasion often worsens at edges and contact points; heat exposure can change rope properties—avoid assumptions if the sling has been near hot work.
Corrosion
Severe corrosion on the rope, fittings, or end attachments is a removal condition. Corrosion can also hide in congested areas near eyes and terminations.
4) End fittings, hooks, and eyes: where critical defects hide
Wire rope sling safety is not only about the rope body—many failures start at terminations.
Hooks & safety latches (where applicable)
- Confirm latch presence and function (where your lifting method uses it)
- Look for throat opening increase, twist, cracks, heavy wear, or deformation
Thimbles and eyes
- Inspect for distortion and wear
- Look for pinching marks that suggest incorrect loading
Ferrules/sleeves (if applicable)
- Check for deformation, cracks, slipping, or sharp edges that suggest movement
5) SS 343 removal criteria (replacement and disposal rules)
A wire rope sling must be removed from service if any of the following are observed:
- Sling tag/identification is missing or illegible
- Severe localized abrasion/scraping or heat damage
- Kinking, crushing, birdcaging, or other structural distortion likely to affect strength
- End attachments are cracked, deformed, or worn such that strength is substantially compromised
- Severe corrosion on rope, fittings, or end attachments
- For strand-laid and single-part slings: more than 10 randomly distributed broken wires in one rope lay, or more than 5 broken wires in a single strand within one rope lay
- Any other condition/visible damage that creates doubt about safe use
So...What to do with slings that fail inspection?
Slings that fail inspection must be tagged out, quarantined, and completely destroyed (e.g., by cutting) so they cannot be reused.
6) A simple inspection routine you can standardize (operator + competent person)
- Before use (operator): the 30-second scan + focused checks on rope body and end fittings
- After use: wipe debris, look for new damage, store correctly (dry, protected, avoid dragging and sharp bends)
- Periodic (Competent Person / AE): scheduled re-examination with documented results and disposition
- After abnormal events: shock load, overload suspicion, dropped load, or chemical/heat exposure → remove from service pending assessment
7) Proof load testing & STL testing services (CTA)
If your lifting gear requires proof load testing (e.g., pre-registration, after major repairs/modifications, or where your lifting plan demands verified performance), STL supports testing and documentation workflows aligned to industrial lifting requirements.
- Service focus: proof load testing and support for lifting gear verification workflows
- Facility note: STL operates testing using a DNV-certified 100-Ton TALURIT Test Bed
Need help confirming your inspection findings or arranging testing?
STL Testing and Certification / Re-Certification
Contact STL / Request a Quote
Frequently Asked Questions (FAQ)
How often must wire rope slings be inspected under Singapore requirements?
Pre-use checks should be done by operators before each lift. Periodic formal re-examinations must be conducted at least every 12 months by an Authorised Examiner or an appointed Competent Person.
Who qualifies as a “Competent Person” for periodic lifting gear re-examinations?
A Competent Person can include SAC-accredited inspection bodies, manufacturer representatives, or qualified in-house inspectors appointed by the workplace occupier with appropriate training and experience.
Are a few broken wires acceptable on a wire rope sling?
Remove from service if there are more than 10 randomly distributed broken wires in one rope lay or more than 5 broken wires in a single strand within one rope lay.
Can a kinked or crushed wire rope sling be repaired?
No. Kinks, crushing, and birdcaging permanently alter the rope’s structure. Slings with these defects must be removed from service and destroyed.
What should be done with wire rope slings that fail inspection?
Tag out, quarantine, and destroy completely (e.g., by cutting) to prevent accidental reuse.
Any other queries on your wire rope sling requirements and needs? Feel free to contact us for more information.
About STL — Sing Teck Leong Marketing and Resources Pte Ltd
Established in 1975, STL is an ISO 9001 and bizSAFE certified one-stop lifting and rigging solution provider in Singapore. We specialize in steel wire rope slings (ROPECO®), alloy chain slings (STEELEX®), and synthetic webbing slings, alongside proof load testing, MOM certification, and re-certification services.
Location: 44 Lok Yang Way, Singapore 628645; Sales Contact:
- Tel: +65 6265 9989
- Email: sales@singteckleong.com