Description

Overview

The inner bush nylon 1.5 inch camshaft bush supports the brake camshaft in early RN Rockwell trailer axles. As a result, the cam runs true under load and braking forces transfer more evenly into the shoes and drums. The nylon bearing surface also helps maintain consistent running clearance between the camshaft and housing while reducing metal-to-metal contact.

Features

This inner bush is sized for a 38mm camshaft with a 44mm outside diameter so it seats correctly in the matching housing. The 28mm length provides a compact support face across the main contact zone. In addition, the nylon construction offers good wear resistance and low friction against a hardened steel cam, which helps the camshaft move smoothly through each brake application.

Specifications and Materials

Part number: FB3115.
The inner bush nylon 1.5 inch camshaft bush suits early RN Rockwell axle designs that use 1.5 inch foundation brake camshafts. Nominal dimensions are 38mm inside diameter, 44mm outside diameter and 28mm overall length for the bush body. The nylon material also provides a stable bearing surface across the temperature range seen in highway trailer brakes. For more detail on the function of brake camshaft bushings, see this manufacturer technical guide

Compatibility and Fitment

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. 1225A781, 1225J634, 28-1253, BP3115, E-1271, FL28.1253, WT3115.

Compliance and Safety

Correct camshaft support is critical for maintaining balanced braking across an axle group. If an inner bush is worn or damaged, the camshaft can tilt and cause uneven shoe wear and reduced braking force. Therefore, inspect this inner bush whenever you service drums, linings or S-cam hardware, then replace it if there is noticeable play or damage.

Trailer Applications

This inner bush nylon 1.5 inch camshaft bush suits early RN Rockwell camshaft arrangements found on many Australian freight and tanker trailers. It is typically installed inside the brake spider or support bracket near the wheel end. It also works with matching outer bushes, seals and camshaft hardware to keep the cam aligned through its full travel so the brake shoes apply evenly. The inner bush nylon 1.5 inch camshaft bush can help keep braking response consistent across compatible setups.

Cross-reference and Suitability

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

Always check each number against your existing part, axle build sheet or OEM catalogue before final selection.

Why Choose ICS Trailers

ICS Trailers focuses on stocking camshaft bushes and brake hardware that suit common Australian trailer axle families. In addition, every listing highlights critical fitment information so workshop staff can match parts quickly and avoid costly returns. For more camshaft and brake hardware options, including matching outer bushes and seals, browse the Foundation Brakes category at ICS Trailers