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Wheel Nut FAQ's
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Safety Wheel Nut - Why should you buy?
WHAT IS A DISC-LOCK SAFETY WHEEL NUT?
THE DISC-LOCK SAFETY WHEEL NUT IS A VIBRATION / SHOCK PROOF
LOCKING NUT FOR HUB PILOTED WHEELS THAT DOES NOT BACK OFF.
IT STAYS IN PLACE ON THE STUD, THEREBY KEEPING THE WHEELS ON
THE VEHICLE.
IS WHEEL LOOSENING REALLY A PROBLEM?
TRUCK WHEELS DO COME LOOSE AND SOME WHEELS DO SEPARATE FROM
THE VEHICLE. SOME SEPARATIONS RESULT IN ACCIDENTS WITH
TRAGIC CONSEQUENCES.
EVEN NON-ACCIDENT WHEEL LOSS INCIDENTS HAVE A COST OF FOUR
FIGURES FOR REPLACEMENT PARTS AND A DAY OR TWO OF DOWN TIME
WAITING FOR REPLACEMENT PARTS. A VISIT TO A TIRE SHOP OR
FLEET SCRAP PILE WILL REVEAL THE FACT THAT THERE IS A WHEEL
LOOSENING PROBLEM.
WHY DO WHEELS LOOSEN?
WHEELS LOOSEN BECAUSE SOMETHING IS WRONG, CAUSING A LOSS OF
CLAMP FORCE. THIS CAN BE CAUSED BY THE WEARING AWAY OF
PAINT, DIRT, NICKS OR BURRS ON MOUNTING SURFACES OF THE
WHEEL SYSTEM, LOW INITIAL TORQUE OR COCKED WHEELS OR BRAKE
DRUM. EASING OF THE CLAMP FORCE LEADS TO WHEEL SHUFFLING AND
WEAR OF THE MOUNTING SURFACES AS THE TRUCK STOPS AND STARTS
AND ENCOUNTERS ROAD SHOCK. MORE WEAR MEANS MORE SHUFFLING
AND MORE LOOSENING. IF NOT STOPPED, THIS PROCESS GOES ON AND
FINALLY THE NUTS VIBRATE OFF THE STUD.
WHAT IS CLAMP LOAD?
CLAMP LOAD IS THE VICE-LIKE SQUEEZING FORCE OBTAINED BY
TIGHTENING THE WHEEL NUT. EACH DISC-LOCK SAFETY WHEEL NUT
AND STUD, WHEN TIGHTENED TO THE RECOMMENDED TORQUE, HOLDS
THE WHEEL TO THE HUB WITH OVER 40,000# CLAMP FORCE. THIS IS
ABOUT TWICE THE CLAMP FORCE OF THE NUT AND STUD ON THE
DOUBLE CAP NUT SYSTEM.
ARENT SOME WHEEL LOSSES CAUSED BY BROKEN STUDS?
THERE IS NO QUESTION THAT WHEEL SEPARATIONS ARE ALSO CAUSED
BY BROKEN STUDS. THE LOOSENING OF THE WHEEL AND THE
UNWINDING OF THE NUT ARE THE CAUSE OF THE PROBLEM.
CAN YOU FORGET ABOUT RE-TIGHTENING WITH DISC-LOCK SAFETY
WHEEL NUTS?
WHILE DISC-LOCK IS IN ACCORD WITH OTHER WHEEL END SUPPLIERS
AND OEM IN MAKING THE RECOMMENDATION TO RE-TORQUE WHEEL NUTS
BEFORE PUTTING NEW VEHICLES IN SERVICE, AFTER 50 TO 100
MILES FOLLOWING A WHEEL/TIRE CHANGE OR INSTALLATION AND AT
P.M. INTERVALS, WE ARE AWARE THAT THIS IS NOT A COMMON
PRACTICE IN THE FIELD.
WHY SHOULD WE USE DISC-LOCK SAFETY WHEEL NUTS?
THE DISC-LOCK SAFETY NUT IS THE FIRST SUCCESSFUL INNOVATION
IN TRUCK/BUS WHEEL MOUNTING IN 60 YEARS. THE DISC-LOCK
SAFETY NUT IMPROVES THE RELIABILITY AND SAFETY OF WHEEL
INSTALLATIONS AT THE OEM, TIRE AND MAINTENANCE SHOPS, TRUCK
STOPS AND ON EMERGENCY ROAD SERVICE CALLS.
THE MANUFACTURER MAY HOLD TO THE PRINCIPLE THAT A CUSTOMER
HAS A RESPONSIBILITY TO MAINTAIN AND TIGHTEN WHEELS PROPERLY
AND THAT THEY WILL DO THIS. HOWEVER, FIELD EXPERIENCE SHOWS
THAT THIS IS NOT THE CASE AND IS BEST CONSIDERED TO BE A
GOAL.
WE, AS MANUFACTURERS, MAY HOLD TO THE PRINCIPLE THAT A
CUSTOMER HAS A RESPONSIBILITY TO BE AWARE OF AND ACKNOWLEDGE
COMMON FIELD PRACTICE AND TO PROVIDE PRODUCTS THAT ARE
PROBLEM SOLVERS. THAT IS WHY THERE IS A DISC-LOCK SAFETY
NUT. WHILE IT CAN NOT OVERCOME ALL OF THE PROBLEMS OF WHEEL
SYSTEM ABUSE, IT IS A NUT THAT STAYS ON STUDS UNDER
CONDITIONS CAUSING THE COMMONLY USED NUT TO RUN OFF. THE
DISC-LOCK SAFETY NUT IS NOT A SUBSTITUTE FOR GOOD WHEEL
MAINTENANCE. THE DISC-LOCK SAFETY NUT IS AN EFFECTIVE
PRODUCT THAT PROVIDES AN EXTRA MARGIN OF SAFETY.
CAN YOU USE ONLY ONE OR TWO DISC-LOCK SAFETY WHEEL NUTS
PER WHEEL TO LOCK THE WHEEL ON?
NO. IT IS IMPORTANT TO NOTE THAT DISC-LOCK RECOMMENDS
DISC-LOCK SAFETY WHEEL NUT USAGE IN COMPLETE WHEEL SETS ONLY
(I.E. EIGHT D L SAFETY WHEEL NUTS ON AN EIGHT HOLE MOUNT AND
TEN D L SAFETY WHEEL NUTS ON A TEN-HOLE MOUNT).
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