ローラー ベアリングの転動体となる、中実または中空構造の円筒形本体。
0.1248 inches minimum and 0.1250 inches maximum overall length, 0.1248 inches minimum and 0.1250 inches maximum rolling element diameter, needle roller, ball ends style designator, sae-j770 assn std single material response overall material document and classification, steel comp e52100 overall material