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Double row angular contact ball bearings 3318 A

Double row angular contact ball bearings 3318 A can withstand radial loads and axial loads acting in both directions; it can limit axial displacement of the shaft or housing in both directions, with a contact angle of 176 degrees. It can provide higher rigidity bearing configuration and can withstand overturning moments. It is mainly used in components that limit the axial displacement of the shaft and housing in both directions.

Product Number: 3318 A

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  • Description
  • Features
  • Application
  • Interchange
Product Number 3318 A
Bore dia 90 mm
Outer dia 190 mm
Width 73 mm
Seal Type Open
Material 52100 Chrome Steel
Dynamic Radial Load 208 kN
Static Radial Load 180 kN
Limiting speed 3400
bearing Interchange 5318


Features of double-row angular contact ball bearings

1、Double row angular contact ball bearings are made of super clean steel to extend the service life by up to 80%.

2, Grease technology, made of fine lubricating grease, can extend the life and performance of the double-row angular contact ball bearings.

3、The stability of double row angular contact ball bearing is strong; even under high-speed rotation and growth, it can maintain smooth operation and reliable quality.

4, the contact angle in the bearing is the journal, and the contact surface of the sliding bearing to the circle of the angle is not too big or too small. Double row angular contact ball bearing contact angle opening angle is diverse and can meet the needs of different machinery.

5、Double row angular contact ball bearings are sealed with advanced sealing technology, which can resist pollution even in very harsh environments and ensure the performance is not reduced.

6、Under the right conditions, the bearing friction coefficient is low, and the heat generated by the bearing is reduced, which can give the bearing a more obvious limit speed when grease lubrication. In different environments, more have different degrees of influence; the use of special or other different environments should be fully considered in the impact brought about.

7, after heat treatment, double-row angular contact ball bearings can be in an environment below 150C for continuous operation if the cage uses polyamide material; the cage limits the impact temperature, and the seal requirements will limit sealed bearings. In addition to optimizing the surface quality, the collar material used for the bearing is also subjected to a special heat treatment. This allows the bearing's inner and outer ring raceways to resist solid particles and mixed friction. Due to the reduction of the surface tension of the lubricant, thus making the working life of the grease is increased.

154、Compared with single-row angular contact ball bearings, the outstanding feature of double-row angular contact ball bearings is that they can simultaneously bear the combined radial and axial loads, limiting the axial displacement of both sides of the shaft. The contact angle determines its axial load capacity and increases with the increase of the contact angle.


Double-row angular contact ball bearings are mainly used to limit the shaft and shell two-way axial displacement in the parts; angular contact ball bearings why used in pairs because double-row angular contact ball bearings have better rigidity and can withstand the overturning moment, especially suitable for applications with high rigidity requirements, such as the front wheel hub of small cars.

In addition, double-row angular contact ball bearings can also be used in oil pumps, Roots blowers, air compressors, various types of transmissions, fuel injection pumps, printing machinery, planetary reducers, extraction equipment, cycloidal reducers, food packaging machinery, welding machines, soldering irons, square boxes, heavy-duty guns, wire strippers, half shafts, inspection and analysis equipment, fine chemical machinery and many other mechanical fields.



Use the tfl angular contact ball bearings interchange chart below to cross-reference bearing part numbers from different manufacturers.

The tfl angular contact ball bearings interchange chart is meant to be a quick cross-reference guide. If you’d like more detailed information like precision, matching, preload, and more part numbers, you can contact our sales staff by live chat or send an inquiry.

TFL Angular Contact Ball Bearings Interchangeable

Description TFL SKF FAG NSK NTN TIMKEN
Single-row angular contact ball bearings Light 72xxB 72xxB 72xxB 72xxB 72xxB 72xxWN
Medium 73xxB 73xxB 73xxB 73xxB 73xxB 73xxWN
Heavy 74xxB 74xxB 74xxB 74xxB 74xxB 74xxWN
Double-row angular contact ball bearings Light 32xxA 32xxA 32xx 52xx 52xx 52xx
Medium 33xxA 33xxA 33xx 53xx 53xx 53xx
Part Number Suffix 40° contact angle B B B B B WN
30° contact angle A A A A
25° contact angle AC AC A5
Non-contact seal -2RZ -2RZ 2RS LLM
Contact seal -2RS1 -2RS1 2RSR LLD
Shield on both sides -2Z -2Z 2Z ZZ DD





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