INANKIB5908Needle Roller / Angular Contact Ball Bearing – 48 mm Shaft Raceway, 62 mm OD, 34 mm Total Width, Double-Direction Thrust

Product Description

What this part is

INA NKIB5908 combined needle roller and angular contact ball bearing, supplied as the outer ring, needle roller set and double-direction angular contact ball assembly. The needle rollers run directly on the shaft. Bore Diameter: 48 mm (shaft raceway as supplied). Outside Diameter: 62 mm. Total Width: 34 mm. Outer ring width: 30 mm. Dynamic Load Rating: 48,500 N radial. Static Load Rating: 67,000 N radial. Axial dynamic load rating: 9,200 N. Axial static load rating: 19,400 N. Limiting Speed: 9,600 rpm. Reference Speed: 7,500 rpm. Rolling Elements: Needle Roller and Ball. Bore Type: Straight. Closure Type: Open. Series: NKIB59. Base Number: NKIB5908.

Decoding the designation

NK — needle roller bearing element.

I — the 59-series NKIB size family, whose inner ring raceway sits at 48 mm on this size.

B — double-direction axial component, using angular contact ball rows.

59 — dimension series 59.

08 — size code within the series.

NA — the execution running on a shaft raceway rather than on a separate inner ring.

What these specs mean in practice

The double-direction axial component locates a shaft against thrust in both directions from a single bearing seat, at 9,200 N dynamic and 19,400 N static axial either way, while the needle roller row carries 48,500 N dynamic radial in a 7 mm wall section.

Reference Speed: 7,500 rpm is the thermally referenced figure. Limiting Speed: 9,600 rpm is the mechanical ceiling. Fatigue load limit: 11,700 N radial and 880 N axial.

Operating temperature range: −30 °C to 120 °C.

Mounting data

Shaft raceway: 48 mm diameter, ground and hardened to 670 HV or better and finished to bearing inner-ring tolerance. That 48 mm figure is Schaeffler’s own inner-ring raceway diameter for this size, so a shaft cut to it reproduces the catalogue geometry exactly.

Minimum chamfer dimension: 0.6 mm. Housing bore: 62 mm. The outer ring measures 30 mm wide and the complete assembly, including the axial component, measures 34 mm.

Quantity and configuration

Unit Quantity: 1 Pc. Outer ring, needle roller set and double-direction angular contact ball assembly, running on the shaft. The matching Schaeffler inner ring for the same size takes the mounting down to a 40 mm shaft seat.

Interchange guidance

NKIB is a Schaeffler combination design. The 59-series envelope and the double-direction axial arrangement are specific to it, so the nine-way interchange that exists for ISO-numbered radial bearings does not apply and none is claimed here. Designation variants: NKIB 5908, NKIB-5908, NKIB5908-NA, NKIB5908-XL.