Checklock SQ®

Checklock SQ® fits across two adjacent nuts to provide a retaining function
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Checklock SQ® - simply use finger force to fit to two nuts
Checklock SQ® - un-tensed, before application to wheel nuts
Checklock SQ® - Product image
Checklock SQ® product showing two wheel nut's retained
Checklock SQ® shown on a wheel
Checklock SQ® on a ten stud wheel
Checklock SQ® on a full ten stud wheel
Checklock SQ® CAD1
Checklock SQ® CAD2
Checklock SQ® boxed
Enquire about Checklock SQ®
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Checklock SQ® is a premium stainless steel wheel nut retainer manufactured in the UK and distributed globally. The Checklock SQ® has two handles that, when squeezed together with the fore finger and thumb, loosen the two coils enough to allow room for two adjacent nuts to pass through. When the handles are released, the coils tighten and grip onto the wheel nuts to retain them which reduces the likelihood of wheel nuts loosening, or backing away from the wheel hub completely. The product is durable and reusable, with no fitting tool required which dramatically reduces maintenance time and costs.
The Checklock SQ® wheel nut retainer is a new product that supersedes the Checklock®, previously made from a circular shaped steel material and now made from a square shaped steel cross-section. The Checklock SQ® has developed to become a core product from Checkpoint Safety and is experiencing high growth, with demand increasing globally. The Checklock SQ® is offered in a very large range of sizes to cover a wide scope of applications throughout the commercial vehicle sector. 

The primary functions of Checklock SQ® are to:

  • Retain wheel nuts to lower the likelihood of them loosening 
  • Greatly reduce the likelihood of wheel nuts backing away completely from the wheel hub
  • Provide a clear commitment to roadworthiness and professionalism to other road users, customers, health and safety, road and transportation associations such as DfT, HMRC Customs and Excise, VOSA, HSE, FTA and RHA
  • Can comfortably incorporate a wheel overheating indicator function 

The primary benefits of fitting Checklock SQ® are:

✓ Improved safety of fittings where nuts are a critical structural component, such as on vehicle wheels and industrial/commercial structures
✓ Much improved vehicle safety through avoiding potentially severe road accidents resulting from loose wheel nuts or wheel detachment
✓ Simple to fit, with no additional tools required, to help the reduction in maintenance time and costs
✓ Reduction in vehicle downtime
✓ Improved professionalism, roadworthiness and safety related company image or reputation
✓ Cost effective solution to implement
✓ High quality premium stainless steel reuseable product 

Additional information

Checklock SQ® is designed to be fitted on wheels without trims/step rings. Where a trim/step ring is fitted to the wheel, Dustite LR® indicators must be used. Checklock SQ® is fitted onto wheel nuts once the nuts have been tightened to the manufacturers recommendations using a suitable torque wrench. The Checklock SQ® should not be used as a direct replacement for a sound, safe vehicle wheel maintenance schedule, should be fitted in accordance with the product guidelines (available from the downloads tab) and used in combination with a robust wheel safety system of checks. 
Checklock SQ® are sized by the corresponding measurement (in millimetres) across the flats of the hexagonal nut fitting, along with a measurement (also in millimetres) of pitch circle diameter (PCD). Current sizes available* include (in mm):
  • 17mm, 139.7 PCD  (4-Stud wheel)
  • 19mm, 139.7 PCD  (4-Stud wheel)
  • 19mm, 165.1 PCD  (5-Stud wheel)
  • 24mm, 205 PCD  (6-Stud wheel)
  • 24mm, 245 PCD  (6-Stud wheel)
  • 27mm, 165.1 PCD  (5-Stud wheel)
  • 27mm, 205 PCD  (6-Stud wheel)
  • 27mm, 275 PCD  (8-Stud wheel)
  • 30mm, 275 PCD  (8-Stud wheel)
  • 30mm, 335 PCD  (10-Stud wheel)
  • 32mm, 225 PCD  (10-Stud wheel)
  • 32mm, 275 PCD  (8-Stud wheel)
  • 32mm, 335 PCD  (10-Stud wheel)
  • 33mm, 285 PCD  (10-Stud wheel)
  • 33mm, 335 PCD  (10-Stud wheel)
  • 38mm, 335 PCD  (10-Stud wheel)
New sizes of Checklock can be developed in a matter of a few weeks, so if your desired size is not included in the list please contact us with an enquiry. If you have any doubts please get as much information as possible and then contact us for assistance in establishing the correct Checklock SQ® for your application.
* Availability depends on current stock levels, dictated by demand.

The Checklock SQ® comes in a standard uncoated stainless steel grey. 

Arms of the Checklock SQ® are pushed together to loosen coils
Checklock SQ® can then be applied to two nuts
Checklock SQ® is always fitted to two adjacent wheel nuts, with the Checklock SQ® arms facing outwards away from the wheel (for right hand threaded nuts)

Checklock SQ® is made from a high grade, premium stainless steel that will not corrode, rust or stain with water, as ordinary steel does. The product has a very long life and can be reused/refitted, ensuring fantastic value for the end user.