|> FAQ > Dually Simulators > Dual Wheel Accuride Numbers and Measurements for fitting Liners|
Dual Wheel Lug Nuts:
Stud Piloted Wheels vs Hub Piloted Wheels:
The Diagrams below show the two types of Lug Nuts.
Cone Bottom , Tapered, "Ball-Seat" Nuts
Found on Older Stud Pilot Wheels.
Fit into chamfered holes in the wheels, center the wheel on the hub. Use Imperial Thread.
On Heavy Duty wheels, Left threads on the left and right threads on the right side.
Flange Nuts, Flat Bottom,
Found on Newer Hub-Pilot Wheels Required by DOTHub Pilot wheels have a hole middle that centers the wheel on the hub, use Metric Thread studs.
The Hub Piloted configuration is stronger, DOT required the transition from stud-piloted to Hub-piloted wheels during the 1990's.
Stud-piloted wheels use the studs and ball-seat cap nuts to position the wheel properly on axle ends. There’s also a big difference in hardware. Stud-piloted dual wheels require both inner and outer nuts – total of 20 per dual assembly. The fasteners on stud piloted wheels come with both right hand and left hand Imperial Thread. Use the right hand threaded fasteners on the right side (curb side); the left hand fasteners on the left hand side. The rear studs on these wheels have square ends.
Hub Piloted, also known as "Unimount" disc wheels are designed to center on the hub at the center hole or bore of the wheel. The wheel center hole locates the wheel on pilots built into the hub. Hub piloted wheels are used with two piece flange nuts which contact the disc face around the bolt hole. Only one nut on each stud is used to fasten single or dual wheels to a vehicle. All stud and nut threads are right hand, Metric Thread. Hub piloted wheels have straight through bolt holes with no ball seat, which provides a visual way of identifying them.
Benefits of Hub-Pilot Wheel configuration:
Reduction of wear between the nut and chamfered hole
Greater clamping force for a given torque
Eliminated necessity for left hand threads on the left side
Hub Pilot Wheel System: Studs and Lug Nuts
Stud Pilot Wheel System: Studs, Cap Nuts and Lug Nuts
The Inner Cap Nut is actually the "Stud" for the Outer Lug Nut