Studs and wheel nuts

Caution
Some trailer axle manufacturers offer axles with “combined” stud lengths, suitable for both thinner steel wheels and thicker aluminium wheels. The length of these studs is designed for a maximum wheel disc thickness of 24.5 mm and does not fit Alcoa wheel size 11.75 x 22.5 / 120 mm inset with 28 mm disc. Longer studs (available) or sleeved cap nuts must be used for this combination. Alcoa wheel size 11.75 x 22.5 / 0 mm inset can be mounted on these axles without any modification.

Wheels with 26 mm bolt hole diameter. Longer studs, standard wheel nut
This wheel version requires longer wheel studs than for steel wheels. The stud length must be checked very carefully.

Dual mounting wheels:
Minimum standout should be 72 mm. Standout is measured from the nave attachment surface to the outer end of the stud.

The normal wheel nut with integral flat washer must be used in connection with longer studs. Correct, longer studs for Alcoa wheels are available from truck and/or axle manufacturers.

Wheels with 32 mm bolt hole diameter, standard studs, Alcoa wheel nuts
The standard steel wheel stud length can accommodate Alcoa wheels with more disc thickness when a special sleeved cap nut is used. The shank of these nuts reaches into the 32 mm mounting holes and compensates the standard stud length.

The shanks do not centre the wheel, the system still requires a hub-piloted axle. Short and long sleeved cap nuts are available from Alcoa in thread sizes for all European vehicles. The torque to obtain the correct clamping force is recommended by your truck/ axle manufacturer. If not, use 550 - 650 Nm.

I Alcoa Technical Data I Wheel Data I Tyre Mounting I Truck Mounting I 26/32 Mounting I Maintenance I Warranty I