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Product Part Codes

Bore Size References

Part codes for bearings and cartridges with standard single seal grooves contain a reference to the bore size:

  • Bore size references ending in ‘M’ indicate metric bores, with the preceding number showing the bore size in millimetres. For example, ‘65M’ indicates a 65mm bore, ‘200M’ indicates a 200mm bore.
  • Bore sizes not ending in ‘M’ indicate inch-size bores. The last two digits indicate sixteenths of an inch, with the preceding digit(s) indicating whole inches. For example:
  • Reference Bore size
    2 7/16"
    4 15/16"
    10 1/2"

Some bearings and cartridges have a hyphenated bore size reference, for example:

01 B 600-160M EX

In this case the reference after the hyphen indicates the bore. The reference before the hyphen is used to distinguish the bearing from other bearings in the same series (in this case 01 Series) which have different dimensions but the same bore size.

To work out the bore size of an existing bearing, only the size reference on the inner race should be used. Outer races, clamping rings and cage and roller assemblies are common to bearings of several bore sizes and may have a ‘group’ size reference that differs from the bore size of the inner race.

The main bearing configurations are explained here.


The SKF Cooper upgraded E-series

The SKF Cooper upgraded E-series includes an extended range of series 01 and 02 bearings in bore sizes up to 150 mm, complementing the entire product range with sizes up to 300 mm.

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