Benefits

• Visually Ensures Safety of Wheel
• Indicates Brake Drag, Over Use or Tight Bearings
• Easy Installation

Application

Product Information

Part # Metric Fractional  General Application STW20 20.5MM 13/16 Courier Style Vehicles STW22 22MM 7/8 1 Ton & 1/2 Ton Vans STW25 25MM 1 Other Courier Vehicles STW27 27MM 1-1/16 School Buses STW28 28MM 1-3/32 Various STW30 30MM 1-3/16 Various STW31 31MM 1-1/4 Spoke Style Hubs STW32 32MM 1-9/32 Various STW33 33MM 1-5/16 Hub Piloted Wheels STW37 37.5MM 1-1/2 Trucks with Older Rounded Nuts STW38 38.1MM 1-1/2 Buses with Newer Pointed Nuts STW40 40.5MM 1-9/16 Hino & Isuzu Trucks STW44 44MM 1-3/4 Construction & Off Road

Installation

1. Check wheel nut, studs, rims and threads for damage unsatisfactory to manufacturers recommendations.
2. Lubricate threads and torque wheel nuts to manufacturers specifications prior to fitting SAFETY WHEEL Nut Indicators. 
3. Size the wheel nut by measuring the A/F [Across the Flats] dimension. 
4. As depicted on right, The SAFETY WHEEL should be a tight slide fit to the washer or hub face, with the triangular arrow spaced (not flush) at the nut base. 
5. Fit the SAFETY WHEEL indicators to a uniform pattern. Any pattern may be used as long as any movement is clearly visible, normally dictated by rim dimension and stud PCD. 

Safety Wheel Application

• If the nut loosens, the SAFETY WHEEL Visual Loose Wheel Nut Indicator will move with it and out of the original uniform pattern, clearly indicating to the operator a need for intervention.
• In the event of brake drag, over use, or tight bearings, the SAFETY WHEEL at a temperature of approximately 123 degrees C [248 degrees F], will deform and change color around the perimeter indicating excessive heat build up. 
• SAFETY WHEEL Visual Loose Wheel Nut Indicator is manufactured from Heavy Duty Service Grade Polyethylene. UV stabilized polymer provides dimensional stability and stops sunlight degradation.