25
How to measure
stud standout
4-3
Stud standout is measured from the axle end mounting surface to the end of the stud.
Inboard mounted drum
Stud Standout
Stud Standout
Outboard mounted drum
Hub
Hub
Exposed
shoulder
Drum
Drum
Mounting
surface
Mounting
surface
End of
stud
End of
stud
4
Stud located ball
seats are
spherical
4-4
The nut seat for the stud located ball seat mounting system is a
precision-machined spherical surface. Cap nuts must be properly
manufactured to assure correct seating. Never use one or two-piece
flange nuts on a wheel designed with ball seats (see 4-12, page 34).
Ball seat cap nuts may be obtained from your Alcoa Wheel Distributor.