Self-Aligning Ball B. SKF 2311 K/C3

The SKF 2311 K/C3 self-aligning ball bearing combines a 55 mm tapered bore with increased C3 clearance for demanding industrial applications involving misalignment.

The 2311 K/C3 self-aligning ball bearing is characterised as a double-row rolling bearing with a hollow-spherical outer ring raceway. With dimensions of a 55 mm bore, 120 mm outer diameter and 43 mm width, this design automatically compensates for misalignment between the shaft and housing caused by manufacturing or load factors. SKF manufactures this open bearing from standard 100Cr6 rolling-element bearing steel with a robust sheet steel cage. This design is suitable for a wide temperature range from –30 to +150 degrees Celsius in industrial machinery applications.

What is the 2311 K/C3 self-aligning ball bearing suitable for in industrial applications?

This double-row bearing proves particularly effective where shaft deflection or misalignment between the bearing seats occurs. Thanks to the spherical outer ring raceway, the two rows of balls adjust to angular movement without generating excessive edge stresses. Typical applications include long shaft runs and flexible support structures prone to angular misalignment. Designers utilise the open design for lubrication circuits in which grease or lubricating oil can reach the rolling elements unhindered.

What advantages do a tapered bore and C3 clearance offer during assembly?

The suffix ‘K’ denotes a tapered bore with a 1:12 taper, which allows for direct mounting on a tapered shaft seat or using a shrink sleeve. During axial mounting, the radial bearing clearance is measurably reduced, which is why the C3 bearing clearance class – increased ex-works – is selected. Once the bearing has been correctly tightened, the required operating clearance is maintained, even when thermal expansion occurs at operating temperatures of up to +150 degrees. The tolerance class P0/PN corresponds to standardised mounting dimensions.