Self-Aligning Ball B. SKF 1306 EKTN9/C3

The SKF 1306 EKTN9/C3 self-aligning ball bearing has a bore diameter of 30 mm, compensates for misalignment and features a tapered inner ring seat.

The 1306 EKTN9/C3 self-aligning ball bearing is a double-row rolling bearing with a hollow-spherical outer ring raceway, which reliably compensates for shaft deflection and misalignment during operation. With key dimensions of a 30 mm bore, 72 mm outer diameter and 19 mm width, the 1306 series accommodates radial loads. Manufactured from 100Cr6 bearing steel and fitted with a lightweight polyamide cage, this design combines suitability for high speeds with smooth running performance, with standard tolerances to P0 or ABEC 1.

What is the 1306 EKTN9/C3 self-aligning ball bearing suitable for in operation?

This double-row bearing is designed for rotating shafts where static misalignment or load-induced deflection occurs between the housing and the shaft. Typical applications include bearing arrangements with shaft misalignment under predominantly radial loads. The rows of balls on both sides absorb radial forces and can withstand moderate axial loads in both directions, whilst the self-aligning principle reduces constraint forces on the raceways.

What is the function of the tapered bore and C3 clearance in bearing 1306?

The tapered inner ring bore with a taper ratio of 1:12 allows mounting on tapered shaft seats or, using suitable adapter sleeves, on cylindrical shafts. The interference fit can be adjusted by axial displacement. As the expansion of the inner ring during press-fitting reduces the bearing clearance, the extended radial clearance class C3 serves to maintain the necessary operating clearance. This counteracts mechanical stress and reduces friction at operating temperatures between –30 and +120 degrees.