實心或空心結構的圓柱體,為滾子軸承提供滾動元件。
rulon a,dixon corp mfr ref single material response overall material document and classification, needle roller, conical ends style designator, plastic overall material, 0.6100 inches minimum and 0.6400 inches maximum overall length, 0.1555 inches minimum and 0.1560 inches maximum rolling element diameter