FAGCylindrical Roller Bearing – 125 mm OD, 18 mm Width, Straight Bore, Machined Brass Cage, X-life

Product Description

What this part is

FAG RNU1918-XL-M1-J30PE single-row cylindrical roller bearing, supplied to Caterpillar as part number 513-1409. Bore Diameter: 85 mm. Outside Diameter: 125 mm. Overall Width: 18 mm. Rolling Elements: Cylindrical Roller. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Machined brass. Bearing Material: Chrome steel. Precision Class: RBEC 1 / P0. Unit Quantity: 1 Pc.

Decoding the designation

RNU — cylindrical roller bearing built as an outer ring with two integral ribs carrying the roller and cage assembly. The rollers run on a hardened, ground shaft raceway.

1918 — ISO dimension series 19, bore code 18. A light section that keeps the outside diameter down to 125 mm at 18 mm width.

XL — X-life execution. Reinforced internal geometry and improved surface finish raise the load rating and the running life over the pre-XL build.

M1 — machined brass cage. Brass tolerates high speed, shock loading and elevated temperature better than a pressed steel or polyamide cage.

What these specs mean in practice

A cylindrical roller carries far more radial load than a ball of the same envelope because the roller contacts the raceway along a line rather than at a point.

The RNU form removes the inner ring from the stack, so the whole 18 mm width is available for rollers and the shaft itself becomes the inner raceway. That buys radial capacity in a shallow envelope and shortens the assembly.

A cylindrical roller bearing has no contact angle and takes no axial load; axial location comes from a separate locating bearing in the arrangement.

Mounting data

The shaft seat serves as the inner raceway and must be hardened and ground to bearing-raceway quality. Outside Diameter: 125 mm to the housing bore. Overall Width: 18 mm.

Quantity and configuration

Unit Quantity: 1 Pc. One complete outer ring with its roller and cage assembly.

Interchange guidance

Cross-Reference 1: Caterpillar 513-1409. Cross-Reference 2: FAG RNU1918-XL-M1, the catalogue execution on the same envelope.

Searchable forms of the designation: RNU1918-XL-M1-J30PE, RNU1918XLM1J30PE, RNU 1918 XL M1 J30PE, RNU-1918-XL-M1-J30PE.