KoyoSingle Row Cylindrical Roller Bearing 130x230x40 mm N Design Non-Locating C3 Clearance

Product Description

What this part is

A Koyo N226 C3 single-row cylindrical roller bearing. Bore 130 mm, outside diameter 230 mm, width 40 mm. Straight bore, open, in the N non-locating design with C3 internal clearance.

Decoding the designation

N denotes the non-locating design: two integral ribs on the inner ring, ribless outer ring. 2 denotes ISO dimension series 2. 26 denotes the bore code, a 130 mm bore. C3 denotes greater than normal internal clearance.

What these specs mean in practice

Cylindrical rollers give a line contact rather than a point contact, so radial capacity is high for the envelope. In the N design the ribless outer ring lets the roller set float axially, which allows the shaft to expand thermally without loading the bearing axially. An NJ design of the same size locates the shaft in one direction and an NUP in both, so the design suffix, not the size, decides axial location. C3 clearance suits an interference fit, a temperature rise across the bearing, or both.

Published specifications

Bore: 130 mm. Outside diameter: 230 mm. Width: 40 mm. Number of rows: 1. Rolling elements: cylindrical rollers. Internal clearance: C3, greater than normal. Bore type: straight. Closure: open. Axial location: non-locating.

Quantity and configuration

1 Pc.

Fitting notes

The bearing is a non-locating position in a shaft system, so a second bearing elsewhere on the shaft carries the axial location. The straight bore mounts directly on the shaft seat with an interference fit on the ring that rotates; even heating of the inner ring seats it without loading the roller path.

Interchange guidance

The ISO equivalent designation is N226 at C3 clearance. An NU226, NJ226 or NUP226 of the same envelope differs in rib arrangement and therefore in axial location, and a CN or C2 clearance variant differs in fitted clearance; those are related sizes rather than interchanges.