Tangless® threaded inserts provide permanent, wear-resistant screw threads that completely eliminate the need for tang break-off and retrieval.

There are two styles of Heli-Coil® tangless® inserts. “Free-Running” tangless® inserts provide a smooth free-running thread. The “Screw-Locking” tangless® insert provides self-locking torque on the male member by a series of “chords” on one or more of the insert coils.

With tangless® inserts, no loose tangs are left behind, and they are the solution when foreign object debris (FOD) cannot be present in critical applications. They eliminate the need for tang break-off and tang retrieval and can be easily adjusted or removed after installation.

These inserts from Heli-Coil® are the original coiled insert and have an extensive background of tension, torque, shear, vibration, and fatigue tests conducted by leading companies as well as the U.S. Military. Tangless® inserts are manufactured using the same materials as standard inserts and provide the same superior performance characteristics. They are available in inch and metric series, coarse and fine.



Fast Facts:

  • Require no staking, locking, swaging, keying, or interference fit (Free-Running).
  • Automatically adjusts to any expansion or contraction of the parent material (Free-Running).
  • Anchor permanently in place against the tapped hole (Free-Running).
  • Positively secures threaded members against vibration or shock loosening (Screw-Locking).
  • High reusability factor due to the exclusive Heli-Coil® Resilient Screw-Lock which permits frequent removal and reassembly of bolt without appreciable loss of torque (Screw-Locking).
  • Positive self-locking torque, complying with MIL-I-8846 and MIL-N-25027.
  • Available in inch and metric series.
  • Successful applications in aviation, electronics, industrial, automotive, and military.
Disclaimer: Tangless® registered trademark of Advanex Inc.

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The availability of the products described on this site, and the product descriptions, may vary from country to country. Consult your STANLEY® Engineered Fastening Account Executive or your local distributor for specific product information.