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。
0.500 inches nominal face width, steel material, 0.750 inches nominal outside diameter, surface treatment is only on outer surfaces; bsc static capacity: 4130 lbs.; bsc dynamic capacity: 1660 lbs.;outer race and rollers data: material is sae 52100,heat treat to rockwell c 58-64; stud data: material is sae 52100,4118,4620,or 8620; threaded to 0.4375-20unf-3a; heat treat raceway to rockwell c 60-64; heat treat stem to rockwell c 51-56; end plate material is brgsteel; seal material is moly-filled nylon; lubrication-lithium soap base grease special features, not casehardened casehardening indicator