5
33
Tightening stud
located, ball seat
cap nuts
(continued)
After 5-50 miles of operation, torque should be rechecked, unless your documented fleet practices determine
otherwise. Loosen outer cap nuts on every other stud to check the torque on inner cap nuts, then retorque
outer cap nuts. Repeat steps on remaining studs. Check torque frequently from then on. If nuts require
frequent tightening, studs break frequently, or wheel nut seats are pounding out, hardware and mounting prac-
tices should be reviewed. Note: whenever the outer cap nut is loosened ALWAYS retorque the inner cap nut
before retorquing the outer cap nut.
Single, dualed
and wide base
wheels, hub piloted
mounting, two-
piece flange nuts
5-9
NOTICE: Do not exceed
maximum wheel load. Cus -
tomer must compare OEM
vehicle load rating to
maximum wheel load rating.
Refer to tire manufacturer’s
recommendation for proper
tire pressure. Be fore mounting
the tire perform a wheel
fitment check to insure
proper clearance from any ob-
structions.
NOTICE: Check for and
replace bent, broken, cracked
or damaged studs. When
replacing broken studs, always
replace the studs on each
side of the broken stud. If two
or more studs are broken,
replace all the studs for that
wheel position. Check with
the stud manufacturer for
regular maintenance and stud
replacement practices.
All wheel fastener hardware
should be grade 8 or metric
conversion 10.9. Follow the
hardware manufacturer’s
recommendations when
replacing studs.
Most U.S. manufacturers of highway trucks, tractors and trailers which incorporate the hub piloted
wheel mounting system require wheel studs and cap nuts with metric threads. Most frequently these
are M22x1.5.
Generally the same diameter stud is used to mount either single or dualed wheels.
Studs on both sides of the vehicle are right-hand threads thereby eliminating the need for flange nuts
peculiar to either the right or left side of the vehicle. The same flange nut is used to mount dualed or
single wheels. Proper stud standout for single wheels is 2.36-inch (60mm) minimum, dualed wheels
require 3.346-inch (85mm) minimum and single wide base wheels require 2.36-inch (60mm).
Some states have laws which dictate full thread engagement or thread engagement past the nut body.
Make sure you know the laws for the states in which you operate and comply.
Disc Mate wheel spacers are recommended for use with Alcoa Dura-Bright
®
surface treated wheels
to protect the wheel contact surfaces from marring. Disc Mate wheel spacers are placed between the
contact surfaces of the Dura-Bright
®
wheel and the brake drum and between the dual wheels as shown
below.
Note: Some stud located ball seat wheels have the same number of holes and bolt circle diameter as
hub piloted wheels. They should not be mixed.
Continued on the next page.
33mm hex head
2-piece flange nut
P/N 39874
Drum
Hub
Hub
Hub
1.38" (35mm) minimum pilot length
for dualed aluminum wheels
1.06" (27mm)
3.346" (85mm) minimum
stud standout dual wheels
2.36" (60mm) minimum
stud standout wide base single wheels
2.36" (60mm) minimum
stud standout single wheels
M22x1.5
Stud
M22x1.5
Stud
M22x1.5
Stud
Drum
Drum
33mm hex head
2-piece flange nut
P/N 39874
Disc Mate (when used)
Disc Mate (when used)
Disc Mates (when used)
Typical assembly of single and dual wheels of hub piloted type with 33mm hex head two-piece flange nut, Part No.
39874. If hex nuts with greater overall height are used, more stud length is required.
Alcoa
Grooved
Bore™
Alcoa
Grooved
Bore™
Alcoa Grooved Bore™
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