Four Point Contact B. SKF QJ328 N2MA/C3

The SKF QJ328 N2MA/C3 four-point bearing, measuring 140x300x62 mm, accommodates high axial loads in both directions and features two retaining grooves in the outer ring.

The QJ328 N2MA/C3 four-point bearing is a single-row angular contact ball bearing with a split inner ring, designed to accommodate axial forces in both directions. With a bore of 140 mm, an outer diameter of 300 mm and a width of 62 mm, this rolling bearing requires less axial installation space than a double-row bearing arrangement. Designed as an open bearing, it operates within a temperature range of -30 to +200 degrees. A brass cage keeps the rolling elements in order during operation.

What loads can the QJ328 N2MA/C3 four-point bearing accommodate?

Typical applications for this design are found where predominantly alternating axial loads occur and space-saving bearing arrangements are required. This roller bearing often functions purely as an axial bearing, whilst a separate radial bearing absorbs the transverse forces. In such a combination, the outer ring is mounted radially free in the housing. The split inner ring also allows for a large number of balls to be fitted, which enhances the axial load-carrying capacity of the bearing arrangement.

What do the C3 clearance and the retaining grooves mean in this variant?

The suffixes provide information about specific design features of this SKF bearing. The designation C3 indicates a slightly increased radial clearance compared with the standard version, which compensates for thermal expansion at high operating temperatures. The designation N2 indicates two retaining grooves in the outer ring, offset by 180 degrees. Retaining pins on the housing side engage with these grooves to prevent the outer ring from rotating unintentionally within the bearing seat. The bearing is manufactured to tolerance class P0 or ABEC 1.