When to retire a chain sling

UNE-EN 818

Take it out of service if…

• The tag or marking is missing or can't be read.[1]

• Wear: the average of two link diameters, measured at right angles, falls below 90 % of nominal. In other words, more than 10 % wear.[1][2]

• Elongation: the link is 5 % longer than its nominal size. The manufacturer measures it over a pitch of three links.[1][2]

• There are bent, twisted, deformed or cracked links.[1]

• There are deep nicks or gouges, especially crosswise.[1]

• Corrosion is advanced or the steel has changed colour from heat.[1]

• Hook: the throat has opened more than 10 %, worn more than 5 %, is cracked or is bent sideways.[1]

• The safety catch is missing, doesn't close or doesn't seat on the hook tip.[1]

• A connector pin has worn more than 10 % of its diameter.[1][2]

• It has welds or repairs not made by the manufacturer.[1]

Before each use

• Legible tag and WLL enough for the working angle.

• Legs free of knots and twists.

• Hooks with a working safety catch.

• No link that looks stretched or bent.

Who inspects it and how often

According to NTP 861, the user checks it daily, and a thorough inspection is needed at least every 12 months, or sooner if the work is heavy, with the result recorded. RD 1215/1997 requires it to be done by competent personnel and documented. The manufacturer also recommends crack testing at least every 3 years.[1][3][2]

Sources

1. [1] INSST, NTP 861. Eslingas de cadena
2. [2] RUD, manual de cadenas de grado 8 VIP
3. [3] RD 1215/1997 (BOE)

Guidance written by TTM inspectors. Your equipment manufacturer's instructions and the standard that applies to it take precedence. Sources reviewed in October 2026.