Description

Overview

The BPW TSB4309 Long Caliper Mounting Bolt secures the main fixed guide pin within the BPW TSB4309 disc brake caliper assembly. Featuring an M16 x 1.5 thread, 103mm nominal length and 10.9 strength grade, this high-tensile fastener supports the caliper guide mechanism on heavy trailer axles.

Unlike the shorter 73mm floating guide-pin bolt, this longer screw fits the main fixed guide-pin position. Selecting the correct length is essential when servicing or rebuilding the caliper assembly.

Features

• 103mm long mounting bolt for the main fixed guide-pin position.
• M16 x 1.5 metric fine thread.
• High-tensile 10.9 strength grade.
• Suits BPW TSB4309 and TSB3709 disc brake guide-pin arrangements.
• Replacement fastener for caliper guide-pin servicing.

Specifications and Materials

• Component: Caliper guide-pin mounting bolt
• Brake system: BPW TSB4309 / TSB3709
• Mounting position: Main fixed guide pin
• Thread: M16 x 1.5
• Nominal bolt length: 103mm
• Strength grade: 10.9
• BPW assembly position: 325

Part number: CH0718G.

For component identification and guide-pin screw specifications, refer to the BPW Transpec disc brake parts guide

Compatibility and Fitment

This long caliper mounting bolt suits the main fixed guide-pin position on compatible BPW TSB4309 and TSB3709 disc brake calipers. The fixed guide pin supports the caliper guidance system, helping maintain correct movement and alignment during braking.

The corresponding loose or floating guide-pin screw measures 73mm and fits a different mounting position. These two lengths are not interchangeable.

Before fitting, compare the removed bolt against the 103mm nominal length, M16 x 1.5 thread and caliper assembly position. Also check the brake model and axle identification, particularly where different BPW brake generations are in service.

Related Parts

Check the following companion service components against the existing caliper before ordering.

Compliance and Safety

BPW specifies that TSB guide-pin mounting screws are single-use fasteners. Always install a replacement screw after removal rather than reusing the existing hardware.

Follow the applicable BPW workshop instructions for tightening torque and installation procedure. Inspect the guide pins, bushes and sealing components for wear, damage or contamination before reassembly.

After fitting, confirm that the caliper moves correctly and that the braking system operates as intended before returning the trailer to service.

Trailer Applications

The long guide-pin mounting bolt supports BPW TSB4309 and compatible TSB3709 disc brake servicing on heavy commercial trailers. Typical applications include semi-trailers, B-double combinations, refrigerated trailers and other freight equipment fitted with these BPW brake assemblies.

Workshops may replace this fastener during guide-pin repairs, caliper overhauls and related disc brake maintenance.

Why Choose ICS Trailers

The BPW TSB4309 Long Caliper Mounting Bolt fits a different guide-pin position from the short mounting bolt, despite sharing the same thread specification. Getting the length and position correct matters when rebuilding a sliding caliper assembly.

ICS Trailers can assist with identifying the appropriate mounting hardware and matching guide-pin repair components for your BPW brake setup.

• Compare the 103mm length, M16 x 1.5 thread and fixed guide-pin position before ordering.
• Send through the removed bolt, caliper markings or axle details if you need help identifying the correct replacement.

Browse more Foundation Brakes