實心或空心結構的圓柱體,為滾子軸承提供滾動元件。
sae assn std single material response overall material document and classification, steel comp e52100 overall material, 0.9800 inches minimum and 1.0000 inches maximum overall length, spherical ends optional special features, 0.3027 inches minimum and 0.3030 inches maximum rolling element diameter