Description

Overview

The double convoluted air spring restores suspension support and isolates road shock in heavy truck, trailer and auxiliary air suspension systems using the matching two-bellows assembly. Its main ordering points are the end-plate layout, mounting centres, air inlet position, compressed height and extended height. Similar airbags can share the same general diameter while using different studs, ports or mounting patterns.

Features

• Double-convoluted rubber bellows design
• Metal upper and lower mounting plates
• Separate threaded air inlet and mounting points
• Supplied as one complete air spring assembly

Specifications and Materials

The assembly combines a double-convoluted rubber bellows with metal end plates and threaded mounting points. The upper plate carries the air inlet and mounting positions, while the lower plate secures the spring to the suspension assembly. Part number: SP556926.

Review the Firestone heavy-duty air spring guide

Compatibility and Fitment

Compare the removed air spring before ordering. Check the upper and lower plate diameters, mounting-hole centres, stud threads, air inlet thread and location, compressed height, extended height and maximum bellows diameter. The most likely mismatch is an air spring that looks similar but carries a different mounting or port arrangement.

These cross-references show where this part replaces the part numbers and applications listed. Some installations may need minor changes. FD200-19504, FD20019504, W013586929, W01-358-6926, W013586926, 2B9288, 6926, 2B9-288, 64516, HS10086, ABSP2B12R-6926, ABSP2B12R6926, FD 200-19 504, AS69260, 578-92-3-211, 578923211, 454-6926L, 4546926L

Compliance and Safety

Support the vehicle or trailer securely and fully exhaust the suspension air before removing the old spring. Inspect the mounting faces, studs, air line and fitting for corrosion, thread damage or air leaks. Tighten the mounting hardware to the suspension manufacturer’s specification, then inflate the system gradually and confirm that the bellows remains centred without rubbing through its full travel.

Trailer Applications

Workshops fit this double-convoluted air spring to matching heavy truck, trailer and auxiliary suspension assemblies. It is particularly suited to repairs where limited installed height requires a compact two-bellows design. Use the old airbag markings and measured mounting layout rather than diameter or appearance alone.

Cross-reference and Suitability

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

Why Choose ICS Trailers

Air spring labels can become difficult to read after years of road grime and movement. Send through the old bellows markings, clear photos, plate diameters, mounting centres, thread sizes and height measurements when you need help narrowing down the correct replacement.

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