Chain Sling Inspection Checklist — Grade 80 & Grade 100 (ASME B30.9)
ASME B30.9 requires a visual inspection before every use and documented periodic inspection at minimum annually. In severe service: quarterly. Remove from service immediately if any link is worn more than 10% of original diameter, elongated more than 3% of rated length, or shows any deformation or heat damage.
Pre-Use Inspection (Visual — Before Every Lift)
Time: 2–5 min · Tools: Visual, torch if needed
Periodic Inspection (Documented — Minimum Annually)
Time: 15–30 min · Tools: calipers, calibrated gauge, inspection form
Rejection Criteria — Remove from Service If Any Apply
| DEFECT | REJECTION THRESHOLD | STANDARD |
|---|---|---|
| Link wear (diameter reduction) | > 10% of original diameter | ASME B30.9 |
| Overall elongation | > 3% of rated length | ASME B30.9 |
| Bent or twisted links | Any visible deformation | ASME B30.9 |
| Cracks or fractures | Any | ASME B30.9 |
| Heat damage (discoloration/anneal) | Any evidence | ASME B30.9 |
| Grade or WLL markings illegible | Unable to read | ASME B30.26 |
| Pitting corrosion | Exceeds manufacturer's limit | ASME B30.9 |
| Known overload or shock load | Any confirmed incident | ASME B30.9 |
Temperature Derating (G80 / G100)
| SERVICE TEMPERATURE | G80 DERATING | NOTE |
|---|---|---|
| ≤ 200°C | No derating | Full rated WLL applies |
| 200°C – 300°C | Reduce WLL by 10% | Reinspect after each use |
| 300°C – 400°C | Reduce WLL by 25% | Strict control, log every use |
| > 400°C | Do not use | Strength cannot be assured |
Grade 100: consult manufacturer datasheet. Reinspect fully after every high-temperature use.
Documentation Requirements
OSHA 1910.184 requires inspection records for rigging hardware. A complete record should include:
Calculate chain sling WLL at any angle and leg count
Chain Sling WLL Calculator →Frequently Asked Questions
How often must chain slings be inspected?
ASME B30.9 requires a visual inspection before each use, plus a documented periodic inspection by a qualified person at minimum annually. In severe service — corrosive environments, high-frequency lifts, abrasive contact — inspect quarterly.
Are the inspection criteria the same for Grade 80 and Grade 100 chain?
The rejection criteria are essentially the same (wear >10% of original diameter, elongation >3%, etc.), but Grade 100 chains often have manufacturer-specific inspection instructions that must also be followed. Both grades require legible grade and WLL markings before each use.
Can a chain sling with surface rust still be used?
Light surface rust is generally acceptable — clean it and inspect for link wear. Pitting corrosion (deep pits) reduces strength and must be evaluated by a qualified person; when in doubt, remove from service.
How long must inspection records be kept?
OSHA 1910.184 requires records to be maintained but specifies no retention period. Industry practice is to keep records for at least 5 years after the sling is retired. Records should include: date, inspector name, findings, and disposition (continue service / repair / retire).
What happens to chain slings used at high temperature?
Grade 80 chain slings: full WLL up to 200°C; derate 10% from 200–300°C; derate 25% from 300–400°C; do not use above 400°C. Inspect after every high-temperature use. Grade 100: check manufacturer datasheet — limits are typically similar.
Can a damaged chain link be repaired by welding?
No. Chain links must never be repaired by welding, heating, or any other means — this destroys the heat treatment and voids the WLL. Replace the entire sling or component. Retired slings must be marked or destroyed to prevent accidental reuse.
Based on published standards data. Not a substitute for qualified rigger judgment. Always verify with manufacturer data.