roller bearing

noun2

1. •
   A bearing in which the load is carried by round (e.g. cylindrical or spherical) elements (rollers).

   • The five roller-bearing A1s are now averaging 120,000 miles between shopping; this figure is an improvement of about 50 per cent on the norm of other ex-L.N.E. Pacific types. — 1961
2. •
   Such a bearing with cylindrical rollers rather than spherical ones (balls).