INARNA4907-2RSR-XLNeedle Roller Bearing – 42 mm Under-Roller Diameter, 55 mm OD, 20 mm Width, Contact Seals Both Sides

Product Description

What this part is

INA RNA4907-2RSR-XL needle roller bearing, single row, sealed on both sides. The part is a machined outer ring carrying a needle roller and cage assembly; the shaft forms the inner raceway. Under-Roller Diameter (Fw): 42 mm. Outside Diameter: 55 mm. Width: 20 mm. Dynamic Load Rating: 29,500 N. Static Load Rating: 39,500 N. Fatigue Load Limit: 7,400 N. Limiting Speed: 6,400 rpm. Weight: 110 g. Minimum Chamfer Dimension: 0.6 mm. Operating Temperature: –20 °C to 100 °C. Number Of Rows: 1. Rolling Elements: needle rollers. Closure Type: contact lip seals both sides. Design Units: Metric.

Decoding the designation

RNA — needle roller bearing supplied as a machined outer ring plus roller-and-cage assembly, to DIN 617 / ISO 1206, running on a hardened and ground shaft raceway.

49 — the dimension series, which sets the 55 mm outside diameter and 20 mm width over a 42 mm roller circle.

07 — the size code inside that series.

2RSR — contact lip seals on both sides.

XL — Schaeffler’s optimised execution, carrying the load ratings quoted above on the standard envelope.

What these specs mean in practice

The radial section between shaft and housing is 6.5 mm, and inside it the needle roller set carries 29,500 N dynamically. That load density is what puts needle bearings into gear pins, connecting rods, pump shafts and swing linkages where a ball or cylindrical roller bearing of the same capacity would need a much larger housing bore.

Static Load Rating: 39,500 N sets the shock and stationary-load ceiling and sits above the dynamic figure, which is normal for a line-contact roller set. Fatigue Load Limit: 7,400 N is the load below which fatigue life is effectively unlimited.

Limiting Speed: 6,400 rpm applies with grease lubrication. The contact lip seals retain that grease at the roller set and exclude swarf and coolant, trading a small amount of running torque for the sealing.

Quantity and configuration

Unit Quantity: 1 Pc.

Mounting data

Shaft seat hardened and ground to 42 mm; it forms the inner raceway. Housing bore 55 mm. Minimum Chamfer Dimension: 0.6 mm at the ring corners. Outer ring width C: 20 mm. Where the shaft cannot be hardened, the NA4907 execution of the same outside diameter adds an inner ring and runs on a 35 mm soft shaft.

Interchange guidance

The open execution on this envelope is the RNA4907-XL and the single-seal execution is the RNA4907-RSR-XL. Bearing Material: chrome steel. RNA4907 is the ISO designation and is carried by other makers on the same 42 x 55 x 20 mm envelope; match the seal code as well as the size, since an open part changes both the closure and the running torque.