Double-row ball bearing 42 series.

Double-Row Ball Bearings — 42 Series (Double-Row Ball Bearings, 42 Series)

What does "42 Series" mean?
The 42 series refers to a series of double-row deep groove ball bearings according to DIN/ISO standards. It is designed for compact constructions where two rows of balls are housed in one bearing to accommodate significantly higher loads than single-row bearings of similar diameter. 

Characteristics of the 42 Series Double-Row Ball Bearings

 Design
Double-row deep groove ball bearings, meaning two rows of balls between the inner and outer ring.
 Comparison to single-row bearings: higher load capacity with similar dimensions.

🔹 Load Behavior
Good accommodation of radial forces and axial loads in both directions.
The double row of balls distributes forces more effectively than single-row bearings.
🔹 Speed & Friction

Despite the double-row design, relatively low friction and suitable for medium to high speeds (depending on sealing/version).
🔹 Sealing / Design

Variants with open bearings, with seal shields (2RS) or with metal shields (ZZ) are possible, depending on the manufacturer.
🔹 Dimensions
Typical sizes range, for example, from 10 mm inner diameter to ~60 mm  (depending on the manufacturer). 

What are these bearings used for?

Double-row bearings of the 42 series are typically used in:

Mechanical engineering, drive shafts, rollers
Pumps and compressors
Automation and conveying technology
Areas where higher loads occur than with single-row bearings.


Example of a typical designation (Briefly explained)
4202-2RS / 4202-ZZ / 4202-TN

42 → Double-row series, Series 42
2RS → rubber seals on both sides
ZZ → metal shields on both sides
TN → cage type, e.g., polyamide cage 

 Standard & Dimensions
The dimensions of the 42 series generally follow **DIN 625/ISO 15** for deep groove ball bearings. This ensures dimensions, tolerances, and fits remain compatible across manufacturers.