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is a loose wheel nut indicator that is used extensively by the transport industry as an enhancement and development of fleet safety roadworthiness procedures.

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Primary Functions

Checkpoint is a loose wheel nut indicator.

  • Used extensively by the transport industry as an enhancement and development of fleet safety roadworthiness procedures, daily walk-round inspection and defect reporting and scheduled maintenance requirements
  • Its use allows accurate monitoring for loose wheel nuts and helps prevent wheel hub damage or the loss of a road wheel should a wheel nut loosen.
  • An additional safety feature of the Checkpoint is its heat sensitivity, when higher than normal operational temperature are reached the Checkpoint is designed to melt indicating an imminent bearing failure or braking issues.

Checkpoint Applicator & Removal Tool

Tool for applying Checkpoint products to your vehicles.

Applies only to checkpoint sizes 31, 32 & 33.


This product has application in various sectors


Examples of various applications


Sizes Available

We stock various sizes for this product.

Checkpoints® are sized by the corresponding measurement (in millimetres) across the flats of the hexagonal nut fitting. Current sizes available* include (in mm):

14, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38, 40, 41, 42, 44, 45, 46, 50

*Available stock levels vary for each size and colour in accordance with demand for each size. For further information or questions please contact us.

* 14mm made to suit All Terrain Vehicles (ATVs).

Convert your measurements with our simple calculator.


Standard Colours

We stock various sizes for this product.

The standard colours for Checkpoint® are Fluoro Yellow and Red, however subject to stock and/or minimum order quantity, the following are also available*:

Blue, Black, Drab Olive Grey, Green, Orange, Silver Grey, White and Solid Yellow.

*Other colours can be made available subject to a high minimum order quantity.

Olive grey
Silver grey
Solid yellow

Recommended Fitting

The Checkpoint is fixed to the wheel nut by gripping the six corners of the hexagon of the wheel nut. When the wheel is being fitted out the Checkpoint pointers should be aligned and set in a recognisable pattern. Should a wheel nut loosen off, the Checkpoint has no option but to move with the nut and so break the recognisable pattern that was set, thus indicating the wheel nut has begun to rotate and therefore to loosen.

The most commonly used patterns are:

Point to point
Elephant file

Any patterned configuration may be used so long as the movement away from the set pattern of one or more of the Checkpoint® will be clearly visible on inspection.

Safe Configuration

Initial point-to-point configuration

Unsafe Configuration

DANGER - Wheel nuts have loosened!

Important Reminder

When arranging the pattern you will use as the layout for the Checkpoint® on the wheel, that should a wheel nut loosen off, the Checkpoint® pointer needs room to move to indicate that the wheel nut has moved; this is normally anti clockwise. The length of the pointer should not therefore be aligned against the wheel rim profile, which could restrict movement.

Initial Fitting:

After Movement:


Material Grade

Checkpoint® is manufactured from Polyethylene. This special grade is suitable for heavy-duty applications such as high load urban duty cycle service or where full axle loading is the norm.

Checkpoint® is designed to distort and melt at a vehicle hub/stud temperature of 125 degrees centigrade. In addition for further severe operating conditions Checkpoint® have a high temp product with a distort/melt point of 135 degrees centigrade.

The material used is a virgin polymer and is UV stabilised. It is therefore dimensionally stable. The polymer does not degrade in sunlight. Checkpoint® can be cleaned using any of the available vehicle cleaning agents, detergent solutions or paraffins.

Checkpoint® are not attacked by road salts or petrochemicals. The pointer being large, it is highly visible even when coated with road or operational grime.



For further information contact Checkpoint Safety