Retainers include products, which, although they cannot initially prevent self-unscrewing, prevent complete unscrewing after a more or less large pretension loss, thus stopping the connection from falling apart.

This category includes, for example, nuts with:

  • Polyamide inner rings (lock nuts with a plastic ring)
  • All-metal lock nuts

Also included are thread inserts and screws with a clamping piece according to DIN 267, part 28.

Retainers also include thread-rolling screws:

  • Retainer due to the special thread
  • Self-tapping screws form their mating thread themselves
  • The positive locking between the bolt thread and the nut thread ensures a tight fit
  • Fibre alignments are not interrupted but rather reshaped and strain-hardened

Read more about thread-rolling screws.

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