HELI-COIL®

Achieve structural integrity and create precision load-bearing, high-strength screw joints with HELI-COIL® threaded inserts.

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Permanent Thread Reinforcement and Repair

Heli-Coil® inserts are coiled metal wires that provide heat-resistant, wear-resistant, and permanent threads for metals and plastics without damaging the native part. Whether you are designing lightweight assemblies or repairing worn internal threads, these precision-formed inserts deliver reliable performance and allow screws to be safely inserted and removed even with frequent use.

Key Benefits of Heli-Coil®

Superior Durability

The elastic properties of the insert distribute load and tension uniformly, resulting in a significantly higher-quality screw joint than a threaded hole without a Heli-Coil®

Exceptional Wear Resistance

The rolled internal threads are made of austenitic chrome-nickel steel, offering an abrasion-resistant surface with a constant and extremely low thread friction torque.

Integrated Screw Locking

The "Screwlock" variants feature a polygonal twist design that creates a captive screw lock through friction, completely eliminating the need for additional washers, wires, or split pins to prevent self-loosening.

Lightweight Construction

By enabling the optimal use of high-strength screws in low shear-strength materials, you can reduce fastener connection points, install space, and overall assembly weight.

Precise Thread Friction

By reducing thread friction and its scatter range, the screw preload force in torque-controlled tightening applications can be adjusted far more precisely.

Broad Material Compatibility

HELICOIL® inserts can securely generate precision threads in low shear-strength materials like aluminum, magnesium alloys, and other die-cast metals.

Product Types

Free Running Inserts

Precision-formed, rhombic-profiled coiled inserts that are free running turn-by-turn to create a true-to-gauge internal thread.

Screwlock Inserts

Helical threaded inserts with integrated locking features that resist vibration-induced loosening while maintaining secure, repeatable fastening in high-performance assemblies.

Tangfree® / Tangless® Inserts

Inserts designed without a driver tang, completely eliminating the need to break off and retrieve tangs during installation.

Tanged Screw Thread Inserts

Engineered for high-vibration environments, these screw-locking tanged inserts feature a resilient internal thread design that secures the bolt against accidental loosening.