This is a A-AH147693 Sprocket, Row Unit, 52 Tooth / 60 Chain PN: AH147693Main Description As Following : A-AH147693 Sprocket, Row Unit; 52 Tooth / 60 Chain P.N: AH147693 Dim A (1): 52 ToothDim B (2): 12.848" O.D.Dim C (3): 1.130" Hex Hub Crossed From: AV103521 VAPORMATIC Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, John Deere HEAD, CORN: 1290 (SN 665401>), John Deere HEAD, CORN: 1291 (SN 665401>), John Deere HEAD, CORN: 1293 (SN 665401>), John Deere HEAD, CORN: 493 (SN 665201>), John Deere HEAD, CORN: 494 (SN 665201>), John Deere HEAD, CORN: 594 (SN 665401>), John Deere HEAD, CORN: 693 (SN 665401>), John Deere HEAD, CORN: 693SH (SN 665401>), John Deere HEAD, CORN: 893 (SN 665401>), John Deere HEAD, CORN: 894 (SN 665401>) Associated Items : New Also This is An Aftermarket Product And : Hub: 1.130" Hex Outside Diameter: 12.848" Teeth: 52