A fixed-loop key ring having an elongated filament with a barrel-shaped head at one end and a locking element at the opposite. Engagement of the locking element in the head forms a nearly circular loop for retaining one or more objects through their eyelets. The barrel-shaped head has a longitudinal bore of decreasing width that intersects a lateral channel entering from the top of the barrel, creating a step at the bore-channel interface. The locking element may be a bifurcated tip with a tapered distal end defined by opposing steps flanking a notch, the notch/steps compressing when inserted into the bore to permit the tapered portion to pass through and into the lateral channel, yet inhibiting withdrawal when engaged to the step inside the barrel-shaped head. A flat-bladed tool may plastically deform the locking element for permanent engagement via insertion between the bifurcations through the lateral channel.