{"product_id":"2-pcs-air-spring-bag-for-trucks-fits-hendrickson-s-20900-s-21800","title":"2 Pcs Air Spring Bag for Trucks Fits Hendrickson S-20900 S-21800","description":"\u003cp\u003eIn this review of the 2 Pcs Air Spring Bag for Trucks, the bottom line is straightforward: this kit is for fleet mechanics and truck owners who need a rugged, OE-quality replacement for Hendrickson trailer and AAT 23K suspensions. The reviewer found the construction-4.5-5.0mm high density rubber and 4140 grade steel studs-gives a noticeably firmer, leak-resistant ride compared with worn original bags. Installation is direct when the part numbers match, and the included dimensions make fit verification simple before purchase.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty rubber:\u003c\/strong\u003e 4.5-5.0mm thick high density rubber exceeds typical OEM thickness and improves durability under heavy loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced studs:\u003c\/strong\u003e 4140 grade steel studs are 25% stronger than standard studs, reducing stud failure risk during heavy service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak-tested:\u003c\/strong\u003e Each spring bag is tested for maximum leakage, which helps maintain consistent air pressure and ride height.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide compatibility:\u003c\/strong\u003e Fits a long list of Hendrickson and AAT part numbers so many S-20900\/S-21800 and AAT 23K users can replace units without modification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear dimensions:\u003c\/strong\u003e Top plate width, piston width, and compressed\/extended heights are listed to ensure a correct fit when cross-checking parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty support:\u003c\/strong\u003e Backed by a 3 year unlimited-mileage quality guarantee for added confidence in long-term use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis kit is aimed at commercial truck owners, trailer maintenance shops, and fleet supervisors who service Hendrickson Intraax and Van Traax or AAT 23K suspensions and need a robust replacement part that closely matches OEM performance. The reinforced studs and thicker rubber make it especially useful where higher load cycles or heavier duty service are common.\u003c\/p\u003e\n\u003cp\u003eIt is not for users who have not verified their exact part number; buyers should check compatibility with W01-358-8709, 1R13-159 and the listed Hendrickson codes before ordering. Owners of non-compatible suspension models should look for a bag explicitly listed for their part number rather than assuming interchangeability.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDurable construction from thicker rubber improves service life under heavy loads.\u003c\/li\u003e\n\u003cli\u003eStronger 4140 steel studs reduce the chance of stud deformation or failure in demanding applications.\u003c\/li\u003e\n\u003cli\u003eEach bag is leak-tested, helping to ensure reliable air retention and ride consistency.\u003c\/li\u003e\n\u003cli\u003eComes with a clear 3 year unlimited-mileage quality guarantee for peace of mind.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatibility requires careful part number verification, so it may not be a drop-in for all trailers without confirming specs.\u003c\/li\u003e\n\u003cli\u003eThe weight and size mean professional handling or shop installation is recommended for most users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e4.5-5.00mm high density rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReinforcement\u003c\/td\u003e\n\u003ctd\u003e4140 grade steel studs (25% stronger)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTop Plate Width\u003c\/td\u003e\n\u003ctd\u003e10.38 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiston Width\u003c\/td\u003e\n\u003ctd\u003e9.15 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompressed Height\u003c\/td\u003e\n\u003ctd\u003e6 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtended Height\u003c\/td\u003e\n\u003ctd\u003e19.4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e14 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e3 year unlimited-mileage quality guarantee\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 2 Pcs Air Spring Bag is a sensible replacement for Hendrickson and AAT 23K applications when the part numbers match; it offers thicker rubber, stronger studs, and leak-tested construction that deliver durability and reliable ride performance for heavy-duty service. For fleets and repair shops seeking value and a backed warranty, it represents a practical, long-lasting choice.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these bags fit my Hendrickson axle?\u003c\/strong\u003e\u003cbr\u003eThey fit S-20900, S-21800, C-20900 and C-21800 families and listed cross-reference numbers, but always verify your exact part number before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the warranty period?\u003c\/strong\u003e\u003cbr\u003eThe product includes a 3 year unlimited-mileage quality guarantee; contact the seller for warranty support.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the studs stronger than OEM?\u003c\/strong\u003e\u003cbr\u003eYes, the studs are 4140 grade steel and are specified as 25% stronger than standard studs to improve durability.\u003c\/p\u003e","brand":"STILEALUS","offers":[{"title":"Default Title","offer_id":48636278309083,"sku":"B0FBVBKKN4","price":140.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61l2YhhLcFL._AC_SL1500.jpg?v=1778736560","url":"https:\/\/gearmusthave.com\/products\/2-pcs-air-spring-bag-for-trucks-fits-hendrickson-s-20900-s-21800","provider":"GearMustHave","version":"1.0","type":"link"}