RNA4907-2RS BKL Brand Needle Roller Bearing without Inner Ring Sealed 42x55x20mm Sealed Viton is used because it

Viton is used because it has a lower probability of catching fire

Semi-flexible

If the shaft cannot be hardened and ground

Little initial chain adjustment is therefore required

general purpose

RNA4907-2RS BKL Brand Needle Roller Bearing without Inner Ring Sealed 42x55x20mm Sealed Viton is used because itNeedle roller bearings with ribs: The outer ring forms a self retaining unit with the needle roller and cage assembly. These radially compact bearings with high load capacity are highly suitable for designs with limited radial space. The bearings are available with and without inner ring and in both sealed and open versions. Bearings without an inner ring are the best solution for bearing arrangements where the shaft can be hardened and ground. Needle