The opening portion at the side of inner ring 10 formed at the edge portions of {HEAD ~ two holding surfaces} 16 adjacent in {TAIL ~ the circumferential direction} is smaller in size in the circumferential direction than the diameter of ball 12 
The opening portion at the side of inner ring 10 formed at the edge portions of { HEAD ~ two holding surfaces } 16 adjacent in { TAIL ~ the circumferential direction } is smaller in size in the circumferential direction than the diameter of ball 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH