Customers often ask about our product nomenclature for cylindrical roller bearings: the numbers and letters that determine a product description. Here’s the “inside story.” For your specific application questions, schedule time with an application specialist.
Cylindrical Roller Bearing Nomenclature Example
Let’s use the following product number as an example: M-A-5-2-06-E-X. In this case, “M” is the series designation, for cylindrical roller bearings, it’s always an M, which stands for “metric.”
Inner Ring Style
The second field is the inner ring style, and it has three variations:
A = plain (no ribs, separable in two directions)
R = single ring (one rib, separable in one direction)
U = double ring (two ribs, non-separable)
Our example indicates a plain inner ring style.
Now let’s look at the third field, which is the width series. Again, there are three variations:
1 = narrow
5 = wide
7 = Intermediate
Our example reflects a wide width series bearing.
The fourth field is the diameter series. In our example, it’s “2,” which means light series. Other designations include:
0 = extra light
2 = light (as in our example)
3 = medium
9 = extra, extra light
Next, we’ll determine shaft size, indicated as 1/5 of the bore size in millimeters. In our example, “06” represents a bore size of 30mm (6 x 5 = 30mm).
Now, let’s determine the outer ring, which we classify as follows:
C = plain cylindrical, no ribs, separable in two directions
D = one rib, separable in one direction
E = two ribs, non-separable
T= no ribs, 2 snap ring grooves, non-separable
U = one rib, 1 snap ring groove, non-separable
The final specification is retainer style. Here are the variations:
X = segmented steel, high-speed, high-load, best lubrication
M = full complement, highest load, lower speed
B = polymeric, quiet
V= formed steel, good value (works for 90% of applications)
To recap, our example bearing is metric, with a plain cylindrical-no-ribs-separable in two directions inner ring, wide width series, light diameter series, 30mm bore, a double-ribbed non-separable outer ring and a segmented steel retainer.
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