Description

Overview

The Fruehauf Pro-Par 11mm spindle nut secures the wheel-end bearing stack on compatible parallel spindle trailer axles. Its 122mm across-flats size and low-profile thickness are key replacement checks.

Features

• 122mm A/F with 86mm ID.
• 3.48″-12 nominal thread for the matching spindle arrangement.
• 11mm thickness for paired inner and outer nut setups.

Specifications and Materials

Across flats: 122mm. Internal diameter: 86mm. Thickness: 11mm. Thread: 3.48″-12.

Part number: AP4004.

See the Fruehauf technical library for trailer maintenance information

Compatibility and Fitment

Match the 122mm A/F, 11mm thickness and 3.48″-12 thread before ordering. A deeper wheel-end nut may suit a similar axle family but use a different locking arrangement.

The following cross-reference numbers identify verified equivalent or replacement parts for this exact application. Confirm the selection-critical fitment details against the part being replaced before fitting.

FQ4063, ACF18231, WT4063, T04-4004

Related Parts

Check the related service parts below against the trailer setup before ordering.

Compliance and Safety

Inspect the spindle thread and lock washer during service. Set bearing adjustment and final locking to the axle manufacturer’s procedure.

Trailer Applications

Workshops use the Fruehauf Pro-Par 11mm spindle nut during hub and bearing service on compatible parallel-spindle and Fuwa trailer wheel ends.

Cross-reference and Suitability

This part cross-references to the following verified equivalent or replacement part numbers:

Why Choose ICS Trailers

The 11mm thickness matters because deeper 122mm A/F wheel-end nuts can look like a close match. If the old markings are unclear, send the nut dimensions, thread details and a photo so ICS Trailers can help narrow down the correct replacement.

• Compare the axle star washer when servicing the paired-nut wheel end.
• Use old markings and axle details to check supported replacement numbers.

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