Air Spring Bag 4 Pcs for Hendrickson S-2066 S-11651 - Heavy Duty

In this review the reviewer examines a 4-piece air spring bag set designed as a Hendrickson replacement for S-2066, S-11651 and related OE numbers. The bottom line: this kit is aimed at fleet owners and technicians who need a durable, heavy-duty replacement that matches common Freightliner and Hendrickson fitments. The single biggest reason to consider these air springs is their construction: 4.5-5.0mm high density rubber and reinforced 4140 grade steel studs that promise OEM-exceeding toughness and long service life under heavy loads.

Key Features

• Vehicle compatibility: Fits a wide range of Hendrickson and Freightliner numbers so replacement installs are straightforward for many truck models.
• Materials and build: Constructed from 4.5-5.0mm thick high density rubber that exceeds OEM requirements for resistance to wear and environmental exposure.
• Reinforced studs: Uses 25% stronger 4140 grade steel studs to reduce stud fatigue and improve long term load retention under repeated cycles.
• Tested for leakage: Each spring bag is tested for maximum leakage, which helps preserve ride height and reduces downtime for repairs.
• Ride and stability: Designed to improve load balancing and reduce vibration, enhancing safety and comfort for heavy duty hauling.
• Warranty: Comes with a 3 year unlimited-mileage quality guarantee for added peace of mind.

Who It's For

This kit is best for commercial vehicle operators, fleet maintenance shops, and owner-operators who run Hendrickson-specified suspensions or Freightliner trucks that accept the listed replacement numbers. Technicians who value a product built to higher-than-OEM thickness and stronger studs will appreciate the durability focus.

Those who should look elsewhere include owners of passenger vehicles or light trucks that do not use these Hendrickson/Freightliner fitments, and operators who require air springs with different dimensions than the stated top plate width, piston width, and heights.

Pros & Cons

Pros

• Durable construction with 4.5-5.0mm rubber that resists abrasion and ozone cracking.
• Reinforced 4140 grade steel studs provide stronger mounting than many aftermarket alternatives.
• Comprehensive fitment list makes it likely to match many Hendrickson and Freightliner part numbers.
• Backed by a 3 year unlimited-mileage warranty for confidence in heavy use.

Cons

• Dimensions are fixed; if your application requires nonstandard heights or widths, these will not fit.
• No customer feedback provided here to confirm long-term field performance beyond factory testing.

Specifications

Top Plate Width	9 in
Piston Width	10.25 in
Compressed Height	7.9 in
Extended Height	20.75 in
Material	4.5-5.0mm high density rubber
Studs	4140 grade steel, reinforced
Weight (set)	15 lbs

Our Verdict

The 4 pcs air spring bag set is a practical, value-oriented replacement for Hendrickson S-2066 and S-11651 style suspensions when matching dimensions and fitments. With thicker rubber and stronger studs than many aftermarket options, it is a sensible choice for fleets and heavy users seeking longer life and reduced maintenance. Buyers should confirm fitment dimensions before ordering, but for compatible trucks this set represents good durability for the price backed by a solid warranty.

Frequently Asked Questions

Will these fit my Freightliner?
They fit Freightliner applications that use W01-358-9082 and the listed replacement numbers; verify your truck part number against the fitment list before purchase.

What is the warranty coverage?
The product includes a 3 year unlimited-mileage quality guarantee; contact the seller for warranty claims or questions.

Are the studs stronger than OEM?
The studs are reinforced 4140 grade steel and advertised as 25% stronger, intended to improve durability under heavy loads.