What is M12 Drag Chain Cable used for?

Cable carriers, robot arms, cobot wrists, gantries.

Which connectors does M12 Drag Chain Cable use?

One end is M12 straight or right-angle, any coding and the other end is M12 or open leads.

What ingress protection does M12 Drag Chain Cable have?

Sealing is rated IP67 when mated - confirm per build.

M12 Drag Chain Cable, Continuous Flex PUR Cordset

Last updated: 13 September 2026

Overview

An M12 drag chain cable is specified around cycle life, not around current rating. In a carrier the copper work-hardens long before the jacket looks tired, so the usual failure is a conductor that has broken inside an intact outer sheath – which presents as an intermittent fault that no multimeter will find on a machine standing still. We build it around the carrier geometry you give us: radius, travel, speed and cycle target.

Key Specifications

Coding	M12 A, B, C, D, X, S, K, T, L or P – to order
Pin count	2 to 12 positions, per coding
Connector ends	M12 straight or right-angle, either end, or M12 to open leads
Conductor	Fine-strand high-flex copper, short equalised lay
Jacket	High-flex PUR for oil, coolant and carrier abrasion
Shielding	Braided overall screen bonded to the coupling nut
Bend radius	Set from the carrier radius you give us at quote stage
Motion	Continuous flex in carrier; torsion construction on request
Ingress rating	IP67 when mated – confirm per build

Why fatigue, not overload, is what actually fails

Pull a failed drag-chain cordset apart and the overmold usually looks fine, the braid is intact and the jacket has no cut in it. The break is inside, at the point where the conductors flexed hardest – normally right where the cable leaves the strain relief. That is why the symptom is intermittent: the broken ends touch when the carrier is at rest and separate as it rolls over the bend. Oversizing the conductor helps a little; choosing the stranding, the lay length and the bend radius correctly helps a lot more.

Reading the carrier before you order

A cable that survives a 150 mm radius carrier will not survive a 60 mm one, whatever the jacket is made of. The table below is what we run through before quoting.

What you tell us	What changes in the build
Carrier bend radius	Sets the minimum construction radius and the stranding class
Travel length and speed	Conductor size, and whether the run needs a support element
Cycle count target	Strand count and lay length
Motion type	Bending only, or torsion – different core layout and screen
What else is in the carrier	Jacket hardness and abrasion resistance

Pinout reference for the two common drag-chain builds

Most continuous-flex M12 runs carry either a 4-pin sensor circuit or a 5-pin device with a spare. These are the wire colors most makers follow, not a guarantee – we terminate to the pinout you send, and on a moving cable the screen termination matters as much as the conductor order.

Pin	Color	A-code 4-pin	A-code 5-pin	Note for flexing builds
1	Brown	+V (24 V DC)	+V (24 V DC)	Sized for the load, not for the signal
2	White	Signal 2	Signal 2	Keep paired with pin 4 where the signal is differential
3	Blue	0 V	0 V	Return
4	Black	Signal 1	Signal 1 (IO-Link C/Q)	Switching output on most sensors
5	Gray	–	Functional earth or spare	Often taken as the shield drain
Shell	–	Braid	Braid	Bonded to the coupling nut at both ends

Where a drag-chain build sits in the M12 coding family

Continuous flexing is a construction, not a coding – the same flex build can be put behind any keyway. What the coding decides is what travels down it. The M12 family below shares one 12 mm thread across every code, which is why the keyway is the only thing keeping a sensor lead out of a motor feed.

Code	Positions	Carries	Typical use
A	3 / 4 / 5 / 8 / 12	DC sensor supply and signals, IO-Link	Proximity switches, photoelectric sensors, valve plugs
B	5	PROFIBUS-DP fieldbus	Legacy drives, remote I/O racks, weigh scales
C	3 to 6	AC power, dual keyway, extended earth	AC sensors, solenoid coils, legacy actuator blocks
D	4	100 Mbit/s Ethernet over two pairs	PROFINET, EtherNet/IP, EtherCAT device drops
K	4 + PE	Three-phase AC power	Motor feeds, power distribution blocks
L	4 + PE	DC power	IO-Link power, AGV and drive supplies
M	5 + PE	Three-phase motor plus brake pair	Servo and geared motors with holding brake
P	4 + PE	Data pairs plus 24 V DC supply	Single-cable EtherCAT and remote I/O blocks
S	3 + PE	Single-phase AC power	Field I/O blocks, cabinet heaters, pumps, fans
T	4	DC power, two circuits	Low-voltage DC distribution
X	8	Up to 10 Gbit/s Ethernet over four pairs	Machine vision, M12 to RJ45 10G links
Y	6 + PE / 8	Hybrid power plus Fast Ethernet	Valve islands, hybrid power and data drops

A, B, C and D are the signal codings set out in IEC 61076-2-101; X is covered by IEC 61076-2-109 and the power codings by IEC 61076-2-111. Y is a de-facto hybrid arrangement used by several makers rather than an IEC-defined code. These are industry-standard descriptions of what each code is for – the values your assembly is built and verified to are the ones stated on your drawing.

Torsion is a different problem from bending

On a six-axis arm or a cobot wrist the cable is twisted as well as bent, and a construction that survives pure bending can fail quickly under torsion. If your application rotates, tell us the rotation angle per meter and the direction before the first article.

Jacket and screen inside a carrier

High-flex PUR – the default for oil mist, coolant and abrasion against the separators. Ask for the high-flex grade; the difference shows at the million-cycle mark.
Braid coverage – a screen that frets against itself as the cable flexes degrades long before the copper does. We specify coverage and bond the braid to the coupling nut so the screen path runs through the connector.

Typical applications for this M12 drag chain cable

Cable carriers on gantries, pick-and-place units and machining centers
Robot arms and cobot wrists, where the run also twists – see our torsion-resistant robot cable
Moving camera and sensor mounts on packaging and filling lines
Encoder and feedback runs on moving axes, alongside our encoder feedback cable with PUR jacket
High-flex Ethernet in a carrier, using our Cat6A high-flex drag chain patch cord

What we need from you

Carrier bend radius and travel length
Cycle count target and speed
Whether the motion is bending, torsion or both
Coding, pin count and pinout
Jacket exposure – oil, coolant, weld spatter, outdoor UV
Length, and quantity for prototype versus production

Workmanship and testing

IPC/WHMA-A-620 Class 3 is the workmanship standard and ISO 9001 is the quality system behind it. We work from 32 to 12 AWG. Nothing ships without a continuity and pinout check, and seal checking can be added where an ingress rating is part of the specification.

Custom builds and ordering

Small runs start at 5 pcs and leave in 3 working days. At production volume the minimum is 500 pcs and lead time is 14 working days after approval. New tooling is about 10 working days on top. OEM and ODM orders ship under your part number, with material certificates and first-article reports available.

Related continuous-flex and M12 assemblies

Full range: Circular M8 and M12 cable assemblies.

Frequently Asked Questions

How long will a drag chain cable last?

That depends on the carrier radius, the travel and the cycle target. Send those numbers and we will size the stranding to them and confirm the construction before the first article.