Heavyduty needle roller bearing without inner ring Feature: 1. Diameter from 5mm-135mm, series contain: NK NKS RNA49 RNA69 RNA48.2. The grinding operation shaft's hardness 58-64hrc, surface rouyhness less than Ra0.2. 3. We can accept nonstandard item as custome's sample or drawingsBearing Designation Approx Mass Boundary Basic Load Rating Limiting speed Current Original g Fw D CCr Dynamic Cr Static rmp NK5/10TN   2.9 5 10 10 2100 1400 36780 NK8/12TN   8.3 8 15 12

1. Needle roller bearings are roller bearings with cylindrical rollers which are thin and long in relation to their diameter. They are referred to as needle rollers. In spite of their low cross section the bearings have a high load carrying capacity and are thus extremely suitable for bearing arrangements where radial space is limited 2. Needle roller bearings have a high load carrying capacity in addition to their low cross-section and stiffness