| 锁紧型螺纹护套 (螺栓锁紧型) |

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The HELI-COIL SCREW-LOCK INSERT provides an exclusive, resilient internal locking thread that grips the bolt and prevents it from loosening under vibration or impact.

Locking action is achieved by one or more of the coils of the Insert having a series of straight segments, or chords. When the bolt enters this grip coil these chordal segments flex outward creating pressure on the bolt. This pressure is exerted between the flanks of the bolt thread thus utilizing the maximum contact area and minimizing the unit pressure.

HELI -COIL SCREW-LOCK INSERTS permit repeated assembly and disassembly, yet will not relax their grip on the screw even in tough metals such as cast iron, alloy steel, titanium, etc.


  • Screw-Lock Inserts positively secure threaded members against loosening caused by vibration and shock. They have a high reusable factor due to the exclusive HELI-COIL Resilient Screw-Lock which permits frequent removal and reassembly of bolt without appreciable, loss of torque.

  • Positive self-locking torque, complying with MIL-I-8846 & MIL-N-25027.

  • Savings in space, weight and money, through the elimination of lock wiring, lock nuts, lock washers, chemical compounds, plastic pellets/patches and other locking mechanisms.

In addition Screw-Lock Screw Thread Inserts have all the characteristics of Free Running Inserts