DID 525VM-FJ O-Ring Chain Link Joint

A clip-type connecting link with a light press-fit construction which gives higher fatigue strength than a slip-fit link while still retaining much of the convenience. It requires more pressure to fit than a slip-fit link, but can still be fitted with a pair of pliers as opposed to special riveting tools required for a rivet link.
No spring link can attain the strength of a rivet link and the FJ spring link has approximately 65% strength of the other links in the chain. However where a rivet link is not feasible then a press-fit link may be used.