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Four-point angular contact ball bearings QJ 338 N2MA

Four-point angular contact ball bearings QJ 338 N2MA can withstand moment loads and have the functions of both single-row angular contact ball bearings and double-row angular contact ball bearings. Four-point angular contact ball bearings can only form two points of contact to ensure normal operation. So it is generally suitable for those pure axial or axial loads with large synthetic loads in two-point contact, four-point contact ball bearing limit speed is high, also suitable for those high-speed running applications.

Product Number: QJ 338 N2MA

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  • Description
  • Features
  • Application
  • Interchange
Product Number QJ 338 N2MA
Bore dia 190 mm
Outer dia 400 mm
Width 78 mm
Seal Type Open
Material 52100 Chrome Steel
Dynamic Radial Load 702 kN
Static Radial Load 1160 kN
Limiting speed 2800

Features of four-point angular contact ball bearings

Four-point angular contact ball bearings can withstand moment loads and have the functions of both single-row angular contact ball bearings and double-row angular contact ball bearings. Four-point angular contact ball bearings can only form two points of contact to ensure normal operation. So it is generally suitable for those pure axial load or axial load with large synthetic load in two-point contact, four-point contact ball bearing limit speed is high, also suitable for those high-speed running applications.

Four-point contact ball bearing is a separable structure; a single bearing can replace the front or back combination of angular contact ball bearings.

It can bear radial and two-way axial loads and limit axial displacement in both directions. Still, the current specifications of the double-row angular contact ball bearings occupy less axial space.

Four-point contact ball bearing compared with other ball bearings, when the radial clearance is the same, the axial clearance is smaller, and the limit speed is higher.


- Individually adjustable radial and axial load-carrying capacity 

- Smaller mounting space than two angular contact ball bearings 

- Quiet, low-vibration operation 

- Suitable for high-speed applications

- Reliable even under difficult operating conditions 

- Long service life 

- Low maintenance/lifetime lubrication 

- Lowest total cost of ownership


Four-point angular contact ball bearing applications

Four-point angular contact ball bearings can withstand both high axial and small radial loads. They can operate at high speeds and are more suitable for higher axial forces than deep groove ball bearings. The outer ring with ball and cage assembly can be mounted separately from the two inner ring halves.

- High-speed capability

- Withstand high axial loads in both directions and small radial loads

- Requires much less axial space than double-row angular contact ball bearings

Four-point angular contact ball bearings are ideal for applications with limited axial space, but axial load capacity in both directions is required.

Four-point contact ball bearings should be considered if design space is limited and a high axial load or speed in both directions occurs. This can occur in applications such as pumps, retarders, compressors, industrial or automotive transmissions, traction motors, or steering columns.

Turbo retarders convert excess kinetic energy from the truck into heat. Such applications require bearings with high terminal speeds and the ability to accommodate rapid speed changes, which is typical for four-point contact ball bearings.

Multi-phase pumps help to extract oil fields more efficiently than conventional methods. These pumps are located on the seabed and increase the pressure of the upstream oil and gas mixture. Therefore the demand for reliability is very high. Typically four point contact ball bearings are subjected to axial loads.

Wind turbine gearboxes transfer energy from a very slowly rotating main shaft (about 18 r/min) to a generator speed of about 193 times higher. Helical gears generate the heavy axial loads on high-speed shafts that must be carried. A combination of cylindrical roller and four-point contact ball bearings is used.

For railroads, there are two main applications. Gearboxes and traction motors usually combine cylindrical roller and four-point contact ball bearings.


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