NTN QJ318 angular contact ball bearing

NTN QJ318 belongs to angular contact ball bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for QJ318 and any equivalents.

The NTN QJ series is an angular contact ball bearing built to carry combined radial and axial loads in a single direction. Because its outer ring is split, the bearing can be mounted and removed more easily than a standard angular contact unit, which helps on equipment where access is tight. Typical applications include pumps, compressors, gearboxes and machine tools that call for precision and rigidity.

Reading the designation is straightforward. The QJ letters identify an angular contact ball bearing with a split outer ring, and the digits that follow give the size within the family, so QJ208, QJ209 and QJ210 are three different sizes. A larger number means a larger bore and higher load capacity. Any suffix printed after the number refers to cage, internal clearance or heat treatment, and it should be matched when a replacement is ordered.

These bearings are found in centrifugal pumps, screw compressors, gearboxes and machine tool spindles, as well as in continuous process equipment where axial and radial loads together require two bearings mounted in opposition. The split outer ring makes changeouts faster in plants that cannot afford a long line stoppage. MR Industrial Accessories LLC supplies the NTN line to customers throughout the United States and in several Latin American countries.

Selection should account for the direction of the axial load, the internal clearance and the sealing or protection the equipment requires. At mounting, verify housing alignment and the tightening of the fastening elements. Use the lubricant specified by the equipment manufacturer, and inspect the split raceway before reusing it. Impacts or misalignment during mounting shorten bearing service life.

Identification relies on the designation and standardized dimensions, so equivalents exist between brands for the same size. If you have a part number from another brand or an unidentified part, the MR team can cross-reference it against the QJ series and point you to the compatible reference. Interchangeability holds as long as clearance, cage and protection type stay the same.

To get a quote, send the part number or the shaft and housing dimensions by WhatsApp or email. The team replies promptly and can also advise on arrangement and mounting for your equipment, and can suggest equivalents when the original reference is not at hand.