The NTN Bower 30311HD is a tapered roller bearing set with a 55 mm inside diameter, a 120 mm outside diameter and a 31.5 mm assembled width. The cone is 29 mm wide and the cup is 25 mm wide. Its bearing designation is 30311, with a dynamic load rating of 155 kN and a static load rating of 179 kN, in tolerance class ABEC-1; RBEC-1; JIS-0; ISO-Normal.

A tapered roller bearing carries radial load and axial thrust at the same time. The cone and cup separate, so they are handled as a matched set. A genuine NTN Bower part from Pro Gear and Transmission.Interchanges:Timken 30311$219.38FeaturesBearing designation 30311Inside diameter 55 mm, outside diameter 120 mmAssembled width 31.5 mm, cone width 29 mm, cup width 25 mmDynamic load rating 155 kN, static load rating 179 kNTolerance class ABEC-1; RBEC-1; JIS-0; ISO-NormalCarries radial load and axial thrust at the same timeTech SpecsBearing designation: 30311Inside diameter: 55 mmOutside diameter: 120 mmAssembled width: 31.5 mmCone width: 29 mmCup width: 25 mmDynamic load rating: 155 kNStatic load rating: 179 kNCatalog series: 30311Tolerance class: ABEC-1; RBEC-1; JIS-0; ISO-Normal