Four-point contact bearings, known for their high load capacity and compact design, are used in many applications. The designation of these bearings, regardless of the manufacturer, follows a specific scheme that contains important information about their properties and design. This guide will help you understand the designation of four-point contact bearings and choose the right bearing for your needs.
Structure of the designation:
Example: QJ 208-MPA-N2
QJ: Indicates the bearing series (four-point contact bearing) and the size.
208: Specifies the bore code, in this case 8 mm.
MPA: Describes the cage type, here a solid cage made of brass.
N2: Informs about the number of retaining grooves in the outer ring, here two.
Elements of the designation:
Bearing series: QJ stands for four-point bearing. Other manufacturers may use different designations.
Bore code: Indicates the inner diameter of the bearing in mm.
Cage type:
MPA: Solid brass cage (high strength, suitable for high speeds)
TVP: Solid cage made of polyamide (light, good sliding properties)
No symbol or other designation: Window cage made of sheet steel or plastic (standard design)
Other suffixes:
C3: Larger axial play than normal
N2: Two retaining grooves in the outer ring
NR: Ring with groove and retaining ring
XL: X-life bearings with optimized performance (Schaeffler)
Explorer: Bearings with optimized performance (SKF)
Choosing the right bearing:
The choice of the right four-point bearing depends on several factors, including:
Load: Static and dynamic loads acting on the bearing.
Speed: Operating speed of the application.
Environmental conditions: temperature, lubrication, contamination.
Installation conditions: installation space, fastening options.
Tips for selection:
High loads and speeds: Choose bearings with a solid brass cage (MPA).
Lightweight construction and good sliding properties: prefer bearings with a solid cage made of polyamide (TVP).
Simple mounting: Use bearings with retaining grooves in the outer ring (N2).
Optimized performance: Consider X-life bearings (Schaeffler) or comparable designs from other manufacturers.
Support from Euro Bearing:
Euro Bearing, your expert for rolling bearings, supports you in selecting the optimal four-point bearing for your application, regardless of the manufacturer. We offer you:
Comprehensive range: Large selection of four-point bearings from various manufacturers.
Expert advice: Our experts will help you choose the right bearing based on the designation and your specific requirements.
Fast delivery: Reliable and fast delivery of your bearings.
Contact Euro Bearing and find the perfect four-point contact bearing for your application!
