NTNNF226Cylindrical Roller Bearing – 130 mm Bore, 230 mm OD, 40 mm Wide, NF Design, Straight Bore, CN Clearance

Product Description

What this part is

NTN NF226 single-row cylindrical roller bearing. Bore Diameter: 130 mm. Outside Diameter: 230 mm. Overall Width: 40 mm. Rolling Elements: Cylindrical Roller. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Pressed steel. Bearing Material: Hardened alloy steel. Internal Clearance: CN. Precision Class: RBEC 1 / P0. Item Weight: 6.62 kg (14.60 lb). Unit Quantity: 1 Pc.

Decoding the designation

N — cylindrical roller bearing. The rollers run on flat raceways, so the bearing carries heavy radial load and takes no thrust from the raceway geometry itself.

F — NTN’s rib arrangement code: two ribs on the inner ring plus one rib on the outer ring. That single outer rib locates the shaft in one axial direction.

2 — ISO dimension series 02, the standard medium section for this bore.

26 — bore code. Multiplied by five it gives the 130 mm bore.

What these specs mean in practice

Dynamic Load Rating: 270,000 N. Static Load Rating: 340,000 N. Line contact between roller and raceway spreads load over a much larger area than a ball does, which is why a 130 mm cylindrical roller carries roughly three times the radial load of a deep groove ball bearing on the same envelope.

Limiting Speed: 2,900 rpm grease; 3,400 rpm oil. Oil feed removes heat that grease cannot, which is the whole of the difference between the two figures.

Internal Clearance: CN. Normal radial clearance, sized for an interference fit on the shaft and a transition or clearance fit in the housing.

Cage Material: Pressed steel. Light, low inertia, and tolerant of the shock loading that heavy cylindrical roller positions see.

Lubricant: grease or oil. The bearing is supplied without an oil hole in the outer ring, so lubricant reaches the rollers from the housing cavity.

Mounting data

Roller path diameter Ew: 204 mm. Cage pitch diameter J: 165.5 mm. Chamfer r: 3 mm, so the abutment fillet radius stays at or below 3 mm. Shaft shoulder da min: 143 mm. Housing shoulder Da max: 217 mm. Inner-ring abutment Db min: 208 mm, Db max: 217 mm.

The inner ring is separable from the outer ring and roller set, so the two halves mount on shaft and housing independently and the assembly closes as the shaft goes home.

Quantity and configuration

One bearing. Unit Quantity: 1 Pc. Complete assembly: outer ring with one rib, inner ring with two ribs, roller complement and pressed steel cage.

Interchange guidance

NF is an ISO design code, so Koyo, NSK and Nachi build a true NF226 on the same envelope and to the same rib arrangement. Those are the closest crosses.

The remaining crosses share the 130 x 230 x 40 mm envelope but change which ring carries the ribs, and with it the direction the bearing locates. An NJ226 locates the opposite way round from an NF226; an NU226 and an N226 locate in neither direction; an NUP226 locates in both. Match the rib arrangement, not just the size.

Searchable forms of the number: NF226, NF-226, NF 226.