This flat U bolt kit fits Mack suspension applications and is sold as a 2-pack, with each kit containing one flat U bolt, one hex nut, and one flat washer. The flat bolt design clamps the leaf spring to the axle housing, helping keep the assembly seated under load. It is built as a replacement for the Mack U bolt hardware set used in this application.Interchanges:6QK3123P107QK3131P10Mack 7QK3154P7This unit is sold in packs of 2.FeaturesSold as a 2-piece pack, each kit sold and used individuallyEach kit includes flat U bolt, nut, and washerFlat U bolt component part number FUB-4774-001Suspension category hardware kitTech SpecsKit contents (each of 2 kits): 1 flat U bolt (FUB-4774-001), 1 nut (FNU-4719 / OEM 21AX655), 1 washer (FWA-0180 / OEM 35AX1435)