Description

Overview

The Fruehauf Pro-Par castellated axle nut secures the wheel-end bearing adjustment on compatible parallel-bearing trailer axles. Its 122mm across-flats size, 85mm internal diameter, 29mm thickness and castellated profile distinguish this version from nearby axle-nut types.

Features

• 122mm across flats for matching the removed axle nut.
• 85mm internal diameter for the parallel-bearing spindle arrangement.
• 29mm overall thickness for dimensional comparison.
• Castellated profile for the matching mechanical retention setup.

Specifications and Materials

Product type: castellated trailer axle nut. Fitment family: Fruehauf Pro-Par parallel-bearing axle. Across flats: 122mm. Internal diameter: 85mm. Thickness: 29mm.

Part number: AP4002.

See the Fruehauf technical library for manufacturer trailer maintenance information

Compatibility and Fitment

Match the 122mm across-flats size, 85mm bore, 29mm thickness and castellated retention arrangement before fitting. The main mismatch risk is choosing a similar Fruehauf wheel-end nut with different dimensions or a different locking method.

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.

E-2550, 12-400, FL12.400, M10HN172, WT4002

Related Parts

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

Compliance and Safety

Inspect the spindle, castellations and locking washer during wheel-end service. After bearing adjustment, secure the nut with the correct retention hardware and follow the axle-specific tightening and bearing-adjustment procedure.

Trailer Applications

Workshops fit the Fruehauf Pro-Par castellated axle nut during hub and bearing service where a parallel-bearing wheel end matches the 122mm A/F, 85mm bore and 29mm thickness.

Cross-reference and Suitability

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

Why Choose ICS Trailers

Large axle nuts can look similar while differing in dimensions and locking arrangement, so compare the removed part before ordering. ICS Trailers can use old markings, photos, the 122mm across-flats measurement and wheel-end details to help narrow down the correct match.

• Support matching the lock washer and surrounding wheel-end service components.
• Help comparing replacement numbers when old markings differ between brands.

Browse more Axle Parts