Description

Overview

The Hendrickson 8091 Air Spring is a complete rolling-lobe air suspension assembly from Sampa, featuring a rubber bellows, plastic piston and internal bumper. Developed from the Firestone 8091 design, it suits selected Hendrickson INTRAAX, VANTRAAX and Ridewell trailer suspensions.

This Firestone-type assembly has two upper mounting positions and one lower piston mounting point. Its plastic piston configuration distinguishes it from steel-piston assemblies and the separate Goodyear-type version.

Features

• Complete air spring with rubber bellows and plastic lower piston.
• Integrated bumper for the specified suspension arrangement.
• Two upper mounting positions and one lower piston mount.
• Rolling-lobe design with 344mm maximum outside diameter.

Specifications and Materials

• Manufacturer: Sampa
• Component: Complete air suspension spring
• Design: Firestone type
• Spring type: Rolling lobe
• Construction: Rubber bellows with plastic piston
• Internal bumper: Yes
• Maximum outside diameter: 344mm
• Specified height: 370mm
• Maximum extended height: 19.01″ (482.9mm)
• Minimum compressed height: 6.26″ (159mm)
• Top plate diameter: 11.31″ (287.3mm)
• Top mounting centres: 5.50″ (139.7mm)
• Top mounting positions: 2
• Bottom piston diameter: 10.16″ (258.1mm)
• Bottom mounting positions: 1
• Quantity supplied: 1 complete air spring assembly

Part number: SP558091-KP.

For air spring construction and replacement information, refer to the Sampa trailer air spring technical catalogue

Compatibility and Fitment

This air spring suits selected Hendrickson INTRAAX AAT23K, AAT25K, AAT30K, AANT23K and AAEDT30K suspensions, plus VANTRAAX HKA and HKANT applications. Compatible Ridewell applications include RAR260, RAR266 and Ridelite Air Ride configurations.

Before fitting, compare the upper stud spacing, plastic piston shape, lower mounting point and air inlet arrangement. Similar bellows may use different piston materials or mounting configurations, so the existing assembly must match.

The following cross-reference numbers identify verified equivalent or replacement parts for this exact application. Confirm the selection-critical fitment details against the part being replaced before fitting.

8091, W01-358-8091, 11 10.5-A 16 P 523, 64421, 1R14-171, 1R14-171S, 1R14-242, 1R14-093, 566CT64421, 566ER8091, 566ER809133, 1DK28E8091, AB1DK28E8091, 4528091, 3528091, 4528091L, 8523, AS1R8091C, RML78091CP, S-20901, S-21784, C-20901, C-21784, 1000156, SP0066M

Related Parts

The following separately available components support servicing of the same air suspension arrangement.

Compliance and Safety

Support the trailer securely and release suspension air pressure before removing the assembly. Inspect the piston seat, upper mounting hardware and air connections for damage.

After installation, restore pressure gradually and check for leaks, correct ride height and clearance throughout suspension travel.

Trailer Applications

This complete air spring supports Hendrickson and Ridewell air suspension systems on compatible semi-trailers, including general freight trailers, refrigerated trailers and other heavy commercial transport equipment.

Cross-reference and Suitability

This part cross-references to the following verified equivalent or replacement part numbers:

Why Choose ICS Trailers

Replacing a Hendrickson 8091 Air Spring requires matching the complete piston and bellows arrangement, not just the suspension model. The Firestone-type plastic piston, two upper mounting positions and single lower attachment are important details when comparing replacement assemblies.

ICS Trailers can assist with identifying the appropriate air spring and associated mounting components for your trailer. If you are replacing an older unit, the original part markings and piston configuration are particularly useful.

• Choose the complete plastic-piston assembly when replacing both the bellows and lower piston.
• Send through the old air spring number, mounting measurements or piston photos if you need assistance identifying the correct replacement.

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