Screw-Lock Inserts

HeliCoil Screw Lock Inserts have all the characteristics of free running inserts but in addition, one or more coils in the middle of the screw lock insert are polygon shaped. These coils serve as a locking device by gripping the threads of the installed screw, effectively preventing the screw from loosening under vibration or impact.

HeliCoil Screw Lock Inserts permit frequent removal and reassembly of bolts without appreciable loss of torque. They positively secure the screw against loosening caused by vibration and shock and they will not relax their grip on the screw even in tough metals such as cast iron, alloy steel, titanium etc.