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Concentric Precision of the Conveyor Rollers


Interroll manufactures conveyor rollers from tubes which comply with the DIN standard. This standard permits deviations in concentric precision.
The concentric deviation is the maximum radial deviation of the diameter of the tube from a perfect circle. Thus, for example, a concentric deviation of t = 0.3 mm means that the maximum radial deviation is 0.3mm over the entire tube.

Concentricity
Fig.: Concentric deviation (t)
Concentric deviation depends first and foremost on the length and material of the tube. It is all the greater the longer a tube is, especially with polymer tubes.
The following section outlines the concentric deviations for complete conveyor rollers for the different tube materials. The graphs show the average concentric deviation according to the tube length for a certain tube diameter.

Please note that DIN-compliant tubes are permitted significantly higher concentric tolerances than are shown in the following diagrams. For this reason, the guideline values presented can be exceeded in individual cases.

Steel tubes

Concentric deviation in
mm		Concentricity Steel tubes
Length of conveyor roller in mm

Polymer tubes

With polymer tubes the concentric deviation increases disproportionately to the length of the tube.
The following lengths should not be exceeded:
Tube diameter mm Maximum tube length mm
20 400
30 500
40/50 600
63 800
90 1000

Concentric deviation in
mm		Concentricity Polymer tubes
Length of conveyor roller in mm

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