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4
Wheel cap nuts
4-2
WARNING Use of chrome-plated cap nuts which have chrome plating on
the surfaces which contact the wheel can cause reduced and inconsistent
wheel clamping.
This condition can cause wheels to loosen and disengage from the vehicle,
causing injury or death.
Never use cap nuts with chrome-plated contact surfaces. Use only
recommended hardware on Alcoa aluminum wheels.
There are many types of nuts and studs in use, and their design and specifications are
not standardized. The “R” and “L” on cap nut part numbers indicate right and left-hand
threads respectively. Alcoa recommends the following cap nuts for use with Alcoa
aluminum truck wheels:
Cap Nuts
2-piece 33mm hex head
flange nut. Mounts single and
dualed wheels to wheel
centering hubs. Right hand
threads used on both sides of
vehicle. Single wheels require 2"
(50.8 mm) stud standout.
Dualed wheels require 2-13/16
(71.44 mm) stud standout.
P/N 39874 (supersedes
P/Ns 39701 and 39691);
M22-1.5 RH threads.
2 piece 1-1/16" hex head
flange nut. Mounts single and
dualed wheels to wheel centering
hubs. Right hand threads used
in both sides of vehicle.
P/N 39946; 5/8"x18 RH threads
2-piece 30mm hex head
flange nut. Mounts single and
dualed wheels to wheel centering
hubs. Right hand threads used
on both sides of vehicle.
P/N 39708; M20x1.5 RH threads.
WARNING
2-piece 33mm hex head
flange nut. Mounts dualed
wheels with 32mm bolt holes
to wheel centering hubs. Right
hand threads used on both
sides of vehicle. P/N 4307.32;
M22x1.5 RH threads.
2-piece 33mm hex head
flange nut. Mounts single
wheels to wheel centering hubs
with 32mm bolt holes. Right
hand threads used on both
sides of vehicle. P/N 4306.32;
M22x1.5 RH threads.
1-1/8" cap nut. Mounts
standard single wheels and
wide base wheels to 1-1/8"
studs. Also mounts outer dualed
wheel to 1-1/8" inner cap nut.
P/N 5996R, 5996L (replaces
P/N 5552R, 5552L).
3/4"x16 cap nut. Mounts Alcoa
wide base wheels to 3/4" studs.
Do not use on steel wheels.
P/N 5995R, 5995L (replaces
P/N 5554R, 5554L).
Inner cap nut, inner
thread 3/4"x16, outer
thread 1-1/8"x16. For
use with standard length
studs (1.31" [1-5/16] to
1.44" [1-7/16]) stud
stand-out) or longer
studs not to exceed
1.88" [1-7/8] stud standout. Full internal and external
threads. P/N 5978R, 5978L (Grade 8). For studs
without exposed shoulders. Do not use with steel
inner dualed wheel.
Inner cap nut for use
with standard length
studs (1.31" [1-5/16] to
1.44" [1-7/16]) stud
standout) or longer
studs not to exceed
1.88" (1-7/8) stud
standout. Full internal
and external threads, counter bore 5/16" deep at
open end. Prevents stud from bottoming out in cap
nut. P/N 5988R, 5988L (Grade 8). For use with
studs with exposed shoulders. Do not use with
steel inner dualed wheel.
Inner cap nut, inner
thread 3/4"x16, outer
thread 1-1/8"x16. For
use with steel inner
dual wheel an
aluminum outer dual
wheel with 1.31"
(1-5/16) to 1.44" (1-7/16) stud standout. P/N 7896R,
7896L (Grade 8).
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