Inquiry / Contact
igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747
+1 401 438 7270

What does the chainflex® "class"(ification) mean?

For over 20 years, igus® has been providing cables under the chainflex® brand for continuous motion within e-chain® cable carriers. chainflex® cables are uniquely suited to work reliably within e-chains® above all else.

To achieve this, chainflex® cables must meet demanding requirements in all e-chain® applications, such as small bending radii, high cycle frequencies, small installation spaces, exposure to various chemicals, and other dynamic parameters.

igus® rigorously tests all chainflex® cables at our in-house technical center and test lab. The results of these tests ultimately lead to all cables being given a specific classification. Each "class" is based on the following four criteria: basic requirements, travel length, oil resistance, and torsion.


chainflex® class is composed of:

chainflex classification
Basic Requirements  1 to 7
Travel Distance  1 to 6
Ouil Resistance  1 to 4
Torsion  1 to 4

Basic Requirements

1: Flexible cables
2: Highly flexible cables
3: Chain-suitable cables without special structure (e.g. stranding in layers) for use in e-chains®.
4: Cables with special design for continuous movement in e-chains®, medium stressing, radii from 7.5 x d, speeds up to 3 m/s
5: Cables for continuous movement in e-chains®, heavy duty use, radius from 6.8 x d, speeds up to 10 m/s
6: Cables for continuous movement in e-chains® for heavy-duty use, for radii from 5 x d, speeds up to 10 m/s
7: Cables for continuous movement in e-chains® for heavy-duty use, indoor and outdoor applications, for radii from 4 x d, speeds greater than 10 m/s


1: unsupported
2: Travels up to 10 m
3: Travels up to 20 m
4: Travels up to 50 m
5: Travels up to 100 m
6: Travels up to 400 m and more

Oil resistance

1: No resistance to oil
2: Oil-resistant according to DIN EN 50363-4-1
3: Oil-resistant according to DIN EN 50363-10-2
4: Oil-resistant according to DIN EN 60811-2-1, bio-oil-resistant according to VDMA 24568 with Plantocut 8 S-MB of DEA


1: No torsion
2: ±90°, with 1 m cable length
3: ±180°, with 1 m cable length
4: ±360°, with 1 m cable length

In theory the following classes would be possible: lowest "Class", highest "Class"

Example: You are looking for a cable which meets the highest mechanical requirements, meets oil resistance requirements in accordance with DIN EN 50363-10-2, travels up to 100m in an unsupported gliding application, and doesn't require any torsional movement. The classification would be as follows:
Basic requirements: 6
Travel distance: 5
Resistance to oil: 3
Torsion: 1

This results in the rating of the cable – "Class" in this case – which you can also find in the respective product pages.

The terms "igus", "Apiro", "chainflex", "CFRIP", "conprotect", "CTD", "drylin", "dry-tech", "dryspin", "easy chain", "e-chain", "e-chain systems", "e-ketten", "e-kettensysteme", "e-skin", "e-spool", "flizz", "ibow", "igear", "iglidur", "igubal", "kineKIT", "manus", "motion plastics", "pikchain", "plastics for longer life", "readychain", "readycable", "ReBeL", "speedigus", "triflex", "robolink", "xirodur", and "xiros" are legally protected trademarks of the igus® GmbH/ Cologne in the Federal Republic of Germany and where applicable in some foreign countries.

igus® GmbH points out that it does not sell any products of the companies Allen Bradley, B&R, Baumüller, Beckhoff, Lahr, Control Techniques, Danaher Motion, ELAU, FAGOR, FANUC, Festo, Heidenhain, Jetter, Lenze, LinMot, LTi DRiVES, Mitsibushi, NUM,Parker, Bosch Rexroth, SEW, Siemens, Stöber and all other drive manufacturers mention in this website. The products offered by igus® are those of igus® GmbH