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HELICOIL® locknuts

Special nuts for secured screw joints.

HELICOIL® locknut

Fastening in high-temperature applications

An efficient and reliable linking of two fasteners

HELICOIL® nuts with integrated HELICOIL® Screwlock ensure locked screw joints, even at high temperatures.

Plus factors

Advantages of HELICOIL® locknuts

  • Screw locking

    Prevents self-loosening. The threads of the HELICOIL® Screwlock clamp the flanks of the screw or bolt to be inserted – for an elastically resilient frictional locking and optimal screw locking.

  • Temperature-resistance

    The locknut retains its strength even at high working temperatures (e.g. in exhaust systems). Seizing is also prevented.

  • Modularity

    High-strength nuts in combination with HELICOIL® Screwlock thread inserts – optionally with washer. No loosening on loss of preload force due to the use of seals. For greater security.

Method and principle

Secure even at high temperatures

The locknut consists of a nut body and the coil thread insert HELICOIL® Screwlock. Screw locking is achieved by the polygonal threads on the HELICOIL® Screwlock. These threads clamp the flanks of the screw or bolt to be inserted. The result is an elastically resilient frictional locking and hence screw locking to prevent self-loosening. Depending on the application, multiple polygonal threads can be used to achieve increased clamping torques.

Body with washer (in the example shown: flange nut variant with washer) + HELICOIL® Screwlock = HELICOIL® locknut
Nut + HELICOIL® Screwlock = HELICOIL® locknut (in the example shown here it is a flange nut with washer)

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Find the right solution for your application

Product types

For the full variety of applications, we offer a selection of different locknuts.

  • HELICOIL® hexagon nut

  • HELICOIL® flange nut

  • HELICOIL® cap nut

  • HELICOIL® weld nut

  • HELICOIL® exhaust manifold nut

  • HELICOIL® nut with integrated flat washer

    for fastening exhaust manifolds and turbocharger attachments

  • HELICOIL® square nut

Information and more


Are you interested in HELICOIL® locknuts? Please download further information here.

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