Abstract: A blade-type chain tensioner constructed from a plastic shoe and a blade spring. The shoe is slightly arcuate and has a pocket along its concave side. At each end of the pocket is a cavity. The blade spring is substantially more arcuate than the shoe and is rectangular. The blade spring is further dimensioned to allow each end of the blade spring to be mounted in the pocket having an end in each cavity at the end of a shoe. Through this configuration the blade spring is mechanically interlocked with the shoe without the use of fasteners or cutouts. The blade spring places a load on the shoe and causing the shoe to creep at an elevated temperature and thereby provide tension to a chain.