Description

Overview

Air spring with plastic piston for Kenworth supports ride height, cushions suspension movement, and helps keep the suspension working evenly across heavy-duty road conditions. This complete air spring assembly suits replacement work when the existing unit leaks, drops ride height, or shows rubber fatigue, and it gives buyers a clear option for matching a Kenworth suspension application that uses this mount pattern and piston style.

Features

• Complete air spring assembly with plastic piston
• Single upper stud and dual lower mounting points
• 9.00in top plate width and 9.50in piston width
• Compressed height 3.80in and extended height 13.30in

Specifications and Materials

This air spring uses a plastic composite-style piston and a complete assembled format for suspension replacement work. Key dimensions include a 9.00in top plate width, 9.50in piston width, 3.80in compressed height, and 13.30in extended height. The mounting layout uses one upper stud and two lower fixing points with 1/2in-13 UNC stud configuration. Part number: SP559616-KP.

See the Firestone commercial air spring catalog

Compatibility and Fitment

Match the top plate size, piston width, mount layout, and suspension application before ordering. These cross-references show where this part replaces the part numbers and applications listed. Some installations may need minor changes. K30316, K303-16, K-303-16, W01-358-9616, W013589616, 1R11-242, 1R11242, 8515, AS-8515, AS8515, 64256, 9 9-12 P 515, 9912P515, 99-12P515

Compliance and Safety

Inspect the air spring for cracked rubber, air loss, plate damage, and loose hardware during suspension service. Replace the unit when ride height drops, the rubber shows rubbing damage, or the assembly no longer holds air correctly, and confirm all fasteners seat properly before returning the vehicle to service.

Trailer Applications

Workshops fit this air spring in heavy vehicle suspension service where a Kenworth-compatible plastic-piston assembly is required. It suits replacement jobs when the original bag no longer supports stable ride height, the suspension sits unevenly, or the existing mount pattern needs a like-for-like air spring layout.

Cross-reference and Suitability

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

Why Choose ICS Trailers

ICS Trailers supplies suspension replacement parts for workshop and fleet jobs where mount pattern, piston style, and application matter before installation.

Browse Suspension parts at ICS Trailers