一種圓柱體,其中心有一個孔,用於安裝銷釘或軸,以便將其連接到推桿導軌、軛桿、搖臂、轉盤或導軌上。此零件與引擎、燃油噴射幫浦、門鎖、轉盤、需要滾輪支撐的平行軸承面等上的氣門桿表面或凸輪環或凸輪軸的凸角形成滾動接觸。不包括:圓柱滾子軸承;電氣開關滾子;以及摩擦軸承。另請參閱凸輪從動件、滾針軸承。
family of hemtt vehicles (heavy expanded mobility tactical trucks); bitum distributor nsn 3990-01-444-6174; cement mixer nsn 3990-01-444-5196; palletized loading system (pls) nsn 2320-01-304-2277 and 2320-01-304-2278 end item identification, not casehardened casehardening indicator, 6.0000 inches nominal face width, 1.5000 inches nominal bore inside diameter, 7.0000 inches nominal outside diameter