This is a A-A5145R Clutch Drive Disc, Powershaft PN: A5145RMain Description As Following : A-A5145R Clutch Drive Disc, Powershaft P.N: A5145R Dim A (1): 3.375" I.D.Dim B (2): 5.625" O.D.Dim C (3): .06" ThicknessDim D (4): 6 TangsReplaces: A4551R, AA6338R Crossed From: AA6338R JOHN DEERE , A4551R JOHN DEERE , WN-A5145R , , WNA5145R , , 114822 , , 1412-6043 , , 14126043 , Found in Section & Models : PTO Parts > PTO and Related Parts, John Deere TRACTOR: 50 (SN 5032350>), John Deere TRACTOR: 520, John Deere TRACTOR: 530, John Deere TRACTOR: 60, John Deere TRACTOR: 620, John Deere TRACTOR: 630, John Deere TRACTOR: 70 (SN 7039400>), John Deere TRACTOR: 720, John Deere TRACTOR: 730 Associated Items : New Also A-FRM-JD, A-JD-O-OMR2033, A-JD-P-PC264, A-JD-S-SM2010, A-JD-S-SM2011, A-JD-S-SM2024, A-JD-S-SM2029, A-JD-S-SM2045, A-JD-S-SM2050, A-SMJD10, A-FRM-JD, A-JD-O-OMR2051, A-JD-P-PC527, A-JD-S-SM2022, A-JD-S-SM2024, A-JD-S-SM2029, A-JD-S-SM2045, A-JD-S-SM2050, A-SMJD16, A-FRM-JD And : Inside Diameter: 3.375" Outside Diameter: 5.625" Replaces: A4551R, AA6338R Tangs: 6 Thickness: 0.06"