1. Bollhoff United Kingdom >
  2. Fasteners >
  3. Special fasteners >
  4. Thread technology >
  5. HELICOIL® nuts

Special nuts with screw lock

HELICOIL® locknuts are one-piece fasteners because the nut is connected to the HELICOIL® screwlock thread insert.


Locking of the screw is achieved by one or several polygonal-shaped threads on the HELICOIL®. These threads clamp the flanks of the screwed-in screw; the result is an elastically resilient frictional locking. The achieved locking torques can be compared to the indications in ISO 2320.


The most important benefits at a glance

  • Screw-locking in the thread
  • Elastically acting screw lock
  • Constant thread friction
  • High temperature resistance
  • Uniform load and stress distribution
  • High repeat screwing-unscrewing cycles

Product types

Different nut body geometries available

Hexagon nut

Nut with integrated washer

Collar nut

Square nut

Cap nut

Weld nut

Download Version Language Type/Size
HELICOIL® locknuts
Special nuts with screw lock
0560/15.02 English PDF / 687 KB

If you are not able to open the document, please install the Adobe Acrobat Reader.

DIN and standard parts

Do you need any information on our product range?


Product catalogues

You need further technical information?

Download centre


You need any product information or support?



Copyright © 2013 Bollhoff Fastenings Ltd. and Bollhoff GMBH - UK DivisionSEO by Rocketfish Ltd