Abstract: A chain comprises inner and outer links that articulate relative to one another on pins. The outer link having apertures which receive said pin ends in such a way that the links are easily assembled or dismantled. The pin ends have a retention portion that defines a flat and a bearing portion disposed between the retention portion and the inner link and defining a bearing surface for the outer link. The aperture in the outer link has an arcuate edge and a flat corresponding to that on the retention portion. The bearing surface has an arcuate portion that provides a rotational sliding fit with the arcuate edge of the outer link aperture and a reduced portion that is undercut with respect to the retention portion.