Each FAG roller bearing has a designation which clearly indicates the type, dimensions, tolerances and internal clearance, if necessary with other important features.
if bearings have the same standardised nomenclature, they are interchangeable with each other. In the case of separable bearings, it cannot always be ensured that individual parts with the same origin can be interchanged with each other. For more information, please refer to FAG bearings cross reference.
FAG bearings nomenclature are standardised in DIN 623-1. These designations are also used in many other countries.
FAG bearings nomenclature
FAG bearing designation is a code comprising numbers and letters
The designation for FAG bearing series comprises numbers and letters or letters and numbers. It indicates the type of bearing, the diameter series and, in many cases, the width series too. The diameter and width series are described also (refer to Rolling bearings main diemensions).
Basic FAG designation, prefix and suffix
Basic designation
The basic FAG designation contains the symbols for the bearing series and the bearing bore. Please refer to bearing nomenclature.
FAG Prefix
The prefix normally identifies individual bearing parts of complete bearings (in certain cases, this may also be part of the basic designation)
FAG Suffix
The suffix defines special designs and features. The prefix and suffix describe other features of FAG bearing but are not standardised in all cases and may vary in use depending on the manufacturer.
FAG designations - Examples
1, FAG Spherical roller bearing
2, FAG Deep groove ball bearing
3, INA Axial cylindrical roller bearing
Designations of FAG metric tapered roller bearings
Structure of bearing designation for metric tapered roller bearings
The 3 indicates the contact angle range. The first letter (F in this case) indicates a diameter series. Each diameter series has a certain ratio D/d (outside diameter to bore diameter). The second letter (E in this case) indicates a width series. Each width series has a certain ratio of bearing width T to the height of the bearing cross-section. The addition of the letter T (for tapered roller bearing) at the start and a three-digit number at the end for the bearing bore diameter in mm (in this case 120) gives the complete designation of a tapered roller bearing
Example designation for FAG metric tapered roller bearings to DIN 720
identifying FAG bearing bore according to the numenclature
For d ＜ 10 mm, the bore diameter is stated in the basic designation
For certain FAG bearing types, the bearing bores are stated directly or in an encoded form in accordance with DIN 623-1. Up to d ＜ 10 mm, the bearing bore diameter is specified in the dimension-specific part of the designation (basic designation) directly as a number indicating the diameter
For example: Deep groove ball bearing 608-2Z, bore diameter = 8 mm.
Bore code
The bore code describes the bearing bore from d ≧ 10 mm
For nominal dimensions d ≧ 10 mm to d ＜ 500 mm, the diameter is described by means of a bore code
For bores from 10 mm to 17 mm, the following applies:
- d = 10 mm, bore code 00
- d = 12 mm, bore code 01
- d = 15 mm, bore code 02
- d= 17 mm, bore code 03
For all FAG rolling bearings in the range from d = 20 mm to d = 480 mm (excluding double direction axial bearings), the bore code is formed by dividing the dimension of the bearing bore by 5.
For example: FAG bearing bore d = 360 mm divided by 5 (360 : 5), bore code = 72.
From d ＞ 480 mm
From d ＞ 480 mm, the unencoded bore diameter is given with an oblique after the bearing series, e.g. 618/500 with bore diameter d = 500 mm.
Intermediate sizes
intermediate sizes, such as bore diameter d = 22, 28 and d = 32 mm for example, are also given with an oblique as /22, /28 and /32.
Magneto bearings
In the case of magneto bearings, the unencoded nominal bore dimension is given.