A stainless steel retainer to help reduce the likelihood of nuts loosening.

This retainer can be used on wheels, machinery and any equipment that has safety critical nuts. It comprises of two coils, which when pushed together widen to sit around two adjacent nuts. Releasing the Checklock SQ® allows the coils to tighten and limit the nuts from loosening.

The Checklock SQ® is manufactured using high quality stainless spring steel which is then heat treated to fix the retaining function and enabling it to be continuously reused.

Certified by TÜV


The Checklock SQ® provides a retaining function which helps prevent loosening of the nuts.

Key benefits

  • Helps to prevent nuts from loosening
  • No fitting equipment required
  • Re-useable
  • Supports fleet safety checks
  • Cost effective and easy to implement

The Checklock SQ® is designed to be used on wheels without trims and step rings. This product can also be combined with a Checkpoint® to provide a more visual appearance and overheating indication. It provides a clear commitment to health and safety, and roadworthiness to other road users, and road and transportation associations such as: DfT, FORS, DVSA, HSE, FTA and RHA.

size guide

Solid Yellow

More information

Specification Gallery Downloads



Premium stainless steel manufactured in square section.


Mainly for commercial vehicles such as buses, trucks and dangerous goods transporters. It is also used in the industrial and mining sector, and wherever safety critical fasteners can loosen due to heavy vibrations and require a retaining function.


All sizes are measured across the flat (a/f) of the nut in mm and require PCD measurements to ensure precise and correct fit.

Nut sizes: 17mm, 19mm, 21mm, 24mm, 27mm, 30mm, 32mm, 33mm, 38mm and 41mm.

We can design and manufacture custom solutions of the Checklock SQ for a wide range of existing and new applications within various sectors. For more information, please contact the sales team.



*While we have made every effort to match our product colours on screen, colour reproduction on the Internet is not precise and should not be relied on. Please contact us for a sample.
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Company number: 01988026 Registered address: Business Lines Ltd T/A Checkpoint, Unit 9, Kellet Road Industrial Estate, Carnforth, Lancashire, LA5 9XP, UK.