4T-30210 Single Row Tapered Roller Bearing 50x90x21.75mm Open For Agricultural & Construction Machinery Axles Product Overview 4T-30210 is standard metric single row tapered roller bearing following ISO and NTN specifications, dimension 50×90×21.75mm. Made of hardened GCr15 bearing steel, equipped with stamped steel cage to guide tapered rollers evenly. The bearing is fully separable: inner ring assembly and outer ring can be taken apart separately, convenient for installatio