一種圓柱形部件,其內圈或外圈在成排的硬化滾珠軸承上轉動,滾珠在滾道上滾動,從而最大限度地減少摩擦。此類零件的特徵是耐腐蝕、重量輕、採用英制尺寸而非公制尺寸、內圈通常突出於外圈表面,或內圈寬度極窄,外徑略大於內孔徑。主要用於飛機組件,例如控制系統和飛機表面。不含:環形滾珠軸承。
0.2490 inches minimum and 0.2500 inches maximum outer ring width, 0.8747 inches minimum and 0.8750 inches maximum bore diameter, radial load direction, 1.3121 inches minimum and 1.3125 inches maximum overall outside diameter, 0.2802 inches minimum and 0.2812 inches maximum inner ring width