TB Wood’s Dura-Flex couplings are designed from the ground up using finite element analysis to maximize flex life. Perfect for a wide variety of applications — including those with uniform to heavy shock loads — Dura-Flex couplings employ a light weight element that absorbs shock loading and torsional vibration. These couplings are available in stock bore-to-size (BTS), Taper-Lock and Sure-Grip bushed (QD) hubs.