Bottom Roller for CAT304 304CR 304.5 305CR 305.5 MS40 Inner Flange 4Bolts. two pieces roller shell rim. Heat treated shells for body strength and longer wear life. Heat treated for a deep uniform hardened depth that provides wear life equal to link wear life.
Will not fit models KX71, KX91-2/2S or U35-4. Replaces Kubota OEM Number(s) RB511-21702, RC411-21306. Side cover: QT 450-10, strength as follows: tensile strength ob (MPa): 2450 yield strength 00.2 (MPa): 2310 hardness: 160 ~ 210 hb.