The ST1 torque limiter from R+W America, Bensenville, Ill. (, protects gearboxes and pumps from torque overloads, and comes in four models. The compact design lets the users add three, six, or nine overload modules that set breakaway torque from 740 to 118,000 lb-ft. Modularity also means users can retrofit individual components or add the unit to customer-designed couplers. And it only takes screws, no hammers, to reengage the coupler.