Spherical Roller Bearings SKF 21312 EK

The SKF 21312 EK self-aligning roller bearing, with a 60 mm tapered bore and lubrication groove, offers high load-carrying capacity for demanding industrial applications.

The SKF 21312 EK self-aligning roller bearing is an open roller bearing designed for high radial and combined loads. With key dimensions of a 60 mm bore, 130 mm outer diameter and 31 mm width, this design automatically compensates for misalignment and shaft deflection during operation. The integrated sheet steel cage guides the rollers evenly. The Explorer version utilises an optimised internal geometry, whilst the permissible temperature range of –30 to +200 degrees enables a wide range of industrial applications.

What loads and operating conditions can the 21312 EK self-aligning roller bearing accommodate?

The double-row roller arrangement reliably withstands high radial forces as well as simultaneously acting axial forces in both directions. Typical applications include shaft mountings prone to deflection or housing misalignment. Fresh lubricant is fed directly between the rows of rollers via the lubrication groove with lubrication holes in the outer ring. The open bearing allows for a continuous supply of lubricant within the machine housing, which aids heat dissipation and helps to reduce wear.

What are the advantages of the tapered bore in the 21312 EK self-aligning roller bearing?

The suffix ‘K’ indicates a tapered bore with a standard taper of 1:12. This design facilitates mounting on tapered shaft journals or, using a suitable adapter sleeve, on smooth shafts. By sliding the bearing onto the shaft axially, fitters can adjust the radial bearing clearance in a controlled manner. The model features standard radial bearing clearance and a restricted running accuracy to tolerance class P5, which ensures smooth and low-vibration operation.