SKFCombined Needle Roller and Thrust Ball Bearing – 45 mm Bore, 58 mm OD, 32 mm Width, Open, Single-Direction Axial Capacity

Product Description

What this part is

SKF NKX 45 combined needle roller and thrust ball bearing. Bore: 45 mm. Outside Diameter: 58 mm. Overall Width: 32 mm. Rolling Elements: Needle rollers in the radial section, balls in the thrust section. Bearing Material: Bearing steel. Closure Type: Open. Bore Type: Straight. Dynamic Load Rating, radial: 27.5 kN. Static Load Rating, radial: 57 kN. Dynamic Load Rating, axial: 28.1 kN. Static Load Rating, axial: 75 kN. Reference Speed: 4 500 r/min. Limiting Speed: 6 300 r/min. Item Weight: 0.252 kg (0.56 lb). GTIN: 7316577106032.

Decoding the designation

NKX — SKF’s series for a radial needle roller bearing combined with a thrust ball bearing in one assembly.

45 — 45 mm bore, giving a 45 x 58 x 32 mm envelope.

No Z suffix — supplied open, without the cover plate carried by the NKX 45 Z execution.

What these specs mean in practice

One assembly does the work of two bearings. The needle roller section takes the radial load in a very small radial section height, and the thrust ball section takes axial load in one direction.

Static ratings well above the dynamic ratings are normal for needle roller sections: line contact across many rollers gives very high resistance to permanent deformation at rest and under shock.

Reference Speed 4 500 r/min and Limiting Speed 6 300 r/min. The reference speed is the thermally-based figure; the limiting speed is the mechanical ceiling of the cage and rolling elements.

The shaft raceway runs directly on the needle rollers, so the shaft seat is a hardened and ground running surface, not a plain fitting diameter.

Quantity and configuration

Unit Quantity: 1 Pc. Single assembly, straight bore, single-direction axial capacity.

Interchange guidance

NKX 45 Z shares the 45 x 58 x 32 mm envelope and the same load ratings, and adds a cover plate on the thrust side. NKXR 45 shares the envelope with a thrust roller section in place of the thrust ball section, which changes the axial ratings.

Searchable designation forms: NKX45, NKX 45, NKX-45.