The Hendrickson S-39401 or S39401 is an air spring designed for the Intraax 25K ZMD suspension system. Sold individually, this is a genuine Hendrickson part for fleets and shops that need an accurate, direct-fit replacement for that specific suspension series. Not certain this is the right spring for your axle or suspension configuration? Give us a call to confirm proper fitment before ordering.Interchanges:HNS-39401FeaturesGenuine Hendrickson part number S-39401 or S39401Application: Intraax 25K ZMD air suspension systemSold as an individual unit (each)Direct OEM replacement air spring for supported Intraax configurationsTech SpecsPart Number: S-39401 or S39401Application: Intraax 25K ZMD suspensionUnit of Measure: Each