A PA28 ON LNDG VEERED TO THE R. FULL L RUDDER TO REMAIN ON RWY. FOUND R MAIN WHEEL TURNED TO R AND STRUT RAISED. R MAIN GEAR CASTING FOUND BROKEN.

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MY STUDENT AND I WERE COMING BACK TO ZZZ ARPT FROM PRACTICING MANEUVERS (PVT PLT). WE CAME BACK AND PRACTICED LNDGS DOING TOUCH-AND-GOES ON RWY 33 AT ZZZ. WE DID 2 AND ON OUR THIRD ONE WE MADE OUR APCH FOR RWY 33. MY STUDENT STARTED TO FLARE AND IT WAS A LITTLE HIGHER THAN NORMAL AND LANDED. WE TOUCHED DOWN A LITTLE HARD; BUT NOTHING TO BE WORRIED ABOUT. AS WE TOUCHED DOWN THE PLANE BEGAN TO VEER TO THE R. I TOOK CTLS AND APPLIED L RUDDER TO MAINTAIN DIRECTION ON THE RWY AND PULLED BACK ON THE CTLS TO SLOW US DOWN. WHEN HELP CAME; WE GOT OUT AND SAW THAT THE R MAIN WHEEL WAS TURNED TO THE R AND THE STRUT HAD RAISED. THE NEXT DAY I FOUND OUT FROM OUR MECHS AT THE SCHOOL THAT WE HAD BROKEN THE MAIN CASTING OF THE R MAIN LNDG GEAR AS WE TOUCHED DOWN CAUSING THE R MAIN TO CANT TO THE R ABOUT 45 DEGS. AFTER THAT; THEY ALSO TOLD ME THAT THERE WAS A SVC BULLETIN FROM PIPER ABOUT THIS SAME PROB THAT THEY DID NOT KNOW ABOUT. THE SVC BULLETIN NUMBER IS 1131 AND WAS ISSUED ON AUG/TUE/03. I NOW KNOW THAT IN A PIPER ACFT THAT IF THESE CRACKS ARE ESTABLISHED THAT THE CAST OF THE GEAR CAN FAIL AND TO ALSO CHK SVC BULLETINS ON MY OWN AND NOT WHAT THE MECHS SHOW ME. THEY ARE CORRECTING THIS PROB BY REPLACING THE CASTING ON BOTH SIDES AND INSPECTION OF ALL THE OTHER PIPER ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE ACFT VEERING TO THE R ON LNDG ROLL WAS THE FAILURE OF THE R MAIN GEAR CASTING. THE RPTR SAID THE CASTING WAS THE SUBJECT OF A PIPER SVC BULLETIN 1131 THAT GAVE INSTRUCTIONS FOR INSPECTING THE CASTING FOR CRACKS AND REPLACING THE CASTING WITH A FORGING. THE RPTR STATED THIS IS NOW BEING DONE IN ALL THE PA28 ACFT AT THE SCHOOL. THE RPTR SAID THE DAMAGE WAS LIMITED TO THE FAILED LNDG GEAR CASTING WITH NO INJURIES.