Chain grades explained: what G30 to G100 actually means

The grade number stamped on a chain link isn't marketing. It tells you the strength of the steel. Higher grade means stronger steel for the same link size, which is why a 10mm Grade 80 chain lifts far more than a 10mm general-purpose chain.

The short version

• Grade 30 (proof coil / general link): general purpose chain. Gates, barriers, tie-downs around the yard. Not for lifting.
• Grade L / Grade 43 / Grade 70: tested and transport chain. Grade 70 is the go-to for load restraint on trucks. Still not for overhead lifting.
• Grade 80 and Grade 100: alloy lifting chain, rated for overhead lifting and used in chain slings, chain blocks and lever hoists. Grade 100 gives roughly 25% more capacity than Grade 80 at the same size.

Why it matters

Overhead lifting puts people under the load. Lifting-rated chain is made from heat-treated alloy steel, batch tested, and stamped so it can be identified and traced. Using transport or general chain in a lifting application is how people get hurt. The steel simply isn't made for it.

What to check before you lift

• The grade stamp on the links (G80, G100, or the maker's equivalent marking)
• The WLL tag on the sling assembly. If the tag's missing or unreadable, the sling is out of service
• Wear, stretch, gouges, and bent or cracked links

If you're not sure what a chain is rated for, don't lift with it. Send us the details and we'll sort you out.

General guidance only. Always follow the manufacturer's ratings and your site's lifting procedures.