{"product_id":"hendrickson-s-28929-heavy-duty-air-spring","title":"Hendrickson S-28929 | Heavy-Duty Air Spring","description":"\u003ch2\u003eHendrickson S-28929 Heavy-Duty Air Spring for Commercial Trailer Air Suspensions\u003c\/h2\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eHendrickson S-28929 Heavy-Duty Air Spring\u003c\/strong\u003e is a genuine OEM replacement air suspension spring engineered specifically for Hendrickson trailer suspension systems. Designed to restore proper ride height, suspension performance, and load support, the S-28929 delivers exceptional durability and ride quality for commercial trailers operating in demanding highway and vocational applications.\n\u003c\/p\u003e\n\n\u003cp\u003e\nManufactured and validated by Hendrickson, this premium air spring utilizes a low-frequency design that improves ride quality while helping reduce vibration, suspension wear, and maintenance costs. Built with premium rubber compounds and engineered piston technology, the S-28929 provides long-lasting performance for fleets, owner-operators, and trailer repair facilities.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe Hendrickson S-28929 is commonly used on \u003cstrong\u003eVANTRAAX® HKANT 40K trailer suspension systems manufactured after January 2008.\u003c\/strong\u003e Always verify your suspension model before ordering.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eGenuine Hendrickson OEM air spring\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for Hendrickson trailer suspensions\u003c\/li\u003e\n\u003cli\u003eRestores proper ride height and suspension performance\u003c\/li\u003e\n\u003cli\u003ePremium heavy-duty rubber construction\u003c\/li\u003e\n\u003cli\u003eLow-frequency design improves ride quality\u003c\/li\u003e\n\u003cli\u003eExcellent resistance to harsh road conditions\u003c\/li\u003e\n\u003cli\u003eOEM fit, function, and reliability\u003c\/li\u003e\n\u003cli\u003eIdeal for commercial fleets and owner-operators\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Hendrickson\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e S-28929\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Heavy-Duty Air Spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuspension Type:\u003c\/strong\u003e Trailer Air Suspension\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eVerified Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eHendrickson VANTRAAX® HKANT 40K Trailer Suspension (January 2008 and newer)\u003c\/li\u003e\n\u003cli\u003eCommercial Dry Van Trailers\u003c\/li\u003e\n\u003cli\u003eRefrigerated Trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed Trailers\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Air Ride Trailer Suspensions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Hendrickson advises that the newer S-28929 air spring should \u003cstrong\u003enot\u003c\/strong\u003e be mixed with the earlier S-22948 design on the same suspension. Replace both air springs together when converting from the older design. This helps maintain proper suspension performance and prevents premature wear.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eVerified Cross Reference Part Numbers\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eHendrickson C-28929\u003c\/li\u003e\n\u003cli\u003eHendrickson S-28929-48\u003c\/li\u003e\n\u003cli\u003eFirestone W01-358-9978\u003c\/li\u003e\n\u003cli\u003eFirestone 1T15M-4\u003c\/li\u003e\n\u003cli\u003eContiTech AS9978\u003c\/li\u003e\n\u003cli\u003eContiTech 67588\u003c\/li\u003e\n\u003cli\u003eGoodyear 1R12-668\u003c\/li\u003e\n\u003cli\u003eGoodyear 1R12-1179\u003c\/li\u003e\n\u003cli\u003eMeritor FS9978\u003c\/li\u003e\n\u003cli\u003eWorld American WA01-9978C\u003c\/li\u003e\n\u003cli\u003eAutomann MHSK485\u003c\/li\u003e\n\u003cli\u003eTriangle AS8959\u003c\/li\u003e\n\u003cli\u003eTorque TR9978\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eAlways verify your VIN, suspension model, or existing air spring before ordering to ensure proper fitment.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Restores factory ride quality\u003c\/li\u003e\n\u003cli\u003e✔ Reduces vibration and road shock\u003c\/li\u003e\n\u003cli\u003e✔ Supports proper trailer ride height\u003c\/li\u003e\n\u003cli\u003e✔ Improves suspension stability\u003c\/li\u003e\n\u003cli\u003e✔ Helps extend suspension component life\u003c\/li\u003e\n\u003cli\u003e✔ OEM-engineered for maximum durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Choose Genuine Hendrickson Air Springs?\u003c\/h3\u003e\n\n\u003cp\u003e\nHendrickson engineers its air springs as part of a complete suspension system—not as universal replacements. Genuine Hendrickson air springs are designed, tested, and validated to deliver the correct spring rate, ride height, and durability for your specific suspension, helping maximize uptime and reduce long-term maintenance costs.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#f8f8f8;padding:25px;border-left:4px solid #ff6a00;margin:25px 0;\"\u003e\n\u003ch3\u003e🔧 Complete Your Suspension Service\u003c\/h3\u003e\n\n\u003cp\u003eRestore your trailer suspension with premium replacement components for maximum reliability and ride quality.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003e✔ Shock Absorbers\u003c\/li\u003e\n\u003cli\u003e✔ Height Control Valves\u003c\/li\u003e\n\u003cli\u003e✔ Suspension Bushings\u003c\/li\u003e\n\u003cli\u003e✔ Torque Rods\u003c\/li\u003e\n\u003cli\u003e✔ Air Brake Components\u003c\/li\u003e\n\u003cli\u003e✔ Wheel Bearings \u0026amp; Seals\u003c\/li\u003e\n\u003cli\u003e✔ Preventive Maintenance Supplies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#fff7ef;padding:20px;border:1px solid #ffb366;border-radius:8px;\"\u003e\n\u003ch3\u003e🚛 Frequently Purchased Together\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ ATRO Suspension Bushings\u003c\/li\u003e\n\u003cli\u003e✔ ContiTech Air Springs\u003c\/li\u003e\n\u003cli\u003e✔ Shock Absorbers\u003c\/li\u003e\n\u003cli\u003e✔ Air Brake Parts\u003c\/li\u003e\n\u003cli\u003e✔ Wheel Seals\u003c\/li\u003e\n\u003cli\u003e✔ Hub Components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKeep your trailer operating at peak performance with premium suspension and wheel-end components trusted by commercial fleets and professional technicians.\u003c\/strong\u003e\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Hendrickson","offers":[{"title":"Default Title","offer_id":44890961248301,"sku":"S-28929","price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/hendrickson-s-28929-air-spring-heavy-duty-suspension-bagair-springshendricksonperformance-diesel-groups-28929-8895702.jpg?v=1782860889","url":"https:\/\/performancedieselgroup.com\/products\/hendrickson-s-28929-heavy-duty-air-spring","provider":"Performance Diesel Group","version":"1.0","type":"link"}