Description

Overview

This camshaft washer 1.5in RN axle supports the S camshaft hardware stack on RN style trailer axles. It helps the camshaft run true so heavy trailer S cam brakes apply smoothly and consistently under load.

Features

The camshaft washer 1.5in RN axle suits standard 1.5 inch S camshafts on common heavy trailer axle sets. The 38mm inside diameter, 51mm outside diameter and 1.6mm thickness match typical RN cam hardware. The flat bearing face spreads load across the bracket, while the controlled thickness helps keep camshaft end float within the correct range.

Specifications and Materials

Part number: FB3112.
This camshaft washer 1.5in RN axle is designed for use in heavy vehicle S cam drum brakes where the camshaft runs in bushes and passes through a support bracket. It typically uses hardened steel so it resists fretting and wear in the high load contact area between the camshaft hub and the bracket face. For an overview of heavy vehicle air brake layouts and typical drum brake components, refer to this air brake systems reference

Compatibility and Fitment

This camshaft washer 1.5in RN axle fits 1.5 inch S camshafts on Rockwell RN rectangular 6 x 4 axles, Rockwell TN round axles and selected SAF J series and KEDI trailer axles. During installation, clean the support face, fit the washer fully against the bracket and then set camshaft end float to the axle maker’s specification.
This cross-reference listing means this part is a suitable replacement for the part numbers and applications shown. Some changes in installation may be required. BP3112, FL29.1309, Freighter 154-00842, IT29.1309, Rockwell 1229J868, Standard Forge 403107, T02-3112, WT3112, FP29.1309, Rockwell RN rectangular 6 x 4 axles, Rockwell TN round axles, SAF J-Series RZ 12242/18C, SAF J-Series RZ10242/18C, SAF KEDI axles

Compliance and Safety

Heavy trailer brake work must follow workshop procedures and the relevant national standards, and a trained technician should always inspect the finished job. Replace any distorted or badly worn washers rather than reusing them, then check S cam movement, brake chamber stroke and slack adjuster position so the brakes keep operating safely.

Trailer Applications

This camshaft washer 1.5in RN axle appears on many Australian semi trailers, dog trailers and other heavy combinations that run 1.5 inch S cam brakes. Workshops typically replace this washer during camshaft rebuilds and scheduled brake overhauls when they renew bushes, seals and related S cam hardware. The camshaft washer 1.5in RN axle is often swapped at the same time as bushes and seals during planned brake servicing.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Before ordering, match these cross-reference details against the axle identification plate and the existing cam hardware. If any doubt remains, measure the current washer and camshaft.

Why Choose ICS Trailers

ICS Trailers focuses on heavy trailer parts, so you get camshaft hardware that suits real workshop conditions. This camshaft washer 1.5in RN axle listing highlights key dimensions and common axle families to help you pick parts that fit first time, and the team can also assist with related bush kits, seals, rollers and brake shoe hardware. Browse similar hardware in our Foundation Brakes category at ICS Trailers