SKF21310CCSpherical Roller Bearing – Straight Bore, 50 mm ID, 110 mm OD, 27 mm Width, Open, Pressed Steel CC Cage, CN Clearance

Product Description

What this part is

A double-row spherical roller bearing in the SKF 213 series, 50 mm bore, 110 mm outside diameter, 27 mm width. Two rows of barrel-profile rollers run on a common spherical outer raceway, so the inner ring, roller and cage assembly swivels inside the outer ring and absorbs up to 2° of shaft-to-housing misalignment while carrying heavy radial load and thrust in both axial directions.

Decoding the designation

21310 gives the ISO base: 213 dimension series, bore code 10 for 50 mm. CC is the SKF cage and internal design code: two pressed steel window cages with an inner ring guide ring between the roller rows. No K follows, so the bore is straight and cylindrical, seated directly on the shaft. No clearance suffix follows, so internal clearance is normal, CN.

What these specs mean in practice

The pressed steel cages of the CC design keep rotating mass low and support a limiting speed of 5600 rpm, where a machined brass cage would raise load capacity and lower the speed ceiling. The 213 series is the shallow cross-section spherical roller family: at 50 mm bore it occupies a 110 mm housing where the deeper 223 series would need more radial space for its higher rating. Self-alignment means a misaligned housing bore does not concentrate load at one end of the roller.

Quantity and configuration

1 Pc. Open bearing, no seals and no shields. Straight bore. No adapter sleeve, locknut, lockwasher or snap ring.

Fitting notes

Mounting force is applied to the inner ring face so the press load does not pass through the rollers. The outer ring aligns itself once the housing is closed. Operating range is −30 °C to 200 °C.

Interchange guidance

FAG 21310-E1, NTN 21310EAD1, NSK 21310EAE4, Timken 21310EJW33 and Koyo 21310RHR share the ISO envelope and the 213 series and interchange on fit. 21310 CCK is a related size rather than a substitute: the K variant has a 1:12 tapered bore and mounts on an adapter sleeve, so the shaft seat is machined differently.