The video shows three sample tests. The first, the mandrel test, measures the input torque that each clamp can handle. As expected, the nut and bolt clamp is stronger here, but JCS says that its worm clamps still handle well over their recommended working torque.
The second, the grip test, measures the efficiency of transferring bolting torque into tension. Using two semi-circle mandrels, the clamping force is calculated by measuring how much the mandrels are squeezed together by each clamp. The worm clamps showed better performance here.
The third, the pressure test, shows how well the clamp seals on a hose. Both clips were tensioned to their recommended working torque, and the worm clamps were shown to withstand far more pressure than nut and bolt clamps, which JCS speculates is down to their geometry. It says: “When fitted, there is a large gap either side of the bridge under the nut and bolt, allowing for fluid to leak past. On the contrary, the hi-torque has much smaller gaps and supplies a much higher clamping force, as discovered in earlier tests, allowing it to withstand a much higher pressure.”
