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。
ams 6440 fed spec single material response and ams 3652 fed spec 2nd material response overall material document and classification, 1.7500 inches nominal overall outside diameter, 0.4370 inches nominal inner ring width, fwd,fuselage 1 ;eagle-f15,acft end item identification, 0.9950 inches minimum and 1.0005 inches maximum bore diameter