What specification connector should be selected for high-temperature resistant aviation plugs used on servo motors?

Bottom line: the "high-temperature aviation plug" for a servo motor is not a single model — it is a set of specifications defined by "M16 main connector + M12 coded sub-links": use M16 for the motor body, and select M12 by coding for power and communication. The selection logic is broken down by link below.

---

1. Quick Selection Table

All parameters are from Octopusconn official public data

Link	Series / Coding	Key specs	Typical use
Motor body main plug	M16 series	2–24 pins · IP67 · -40~+85℃ · up to 7A/250V	Servo motors, encoders, general power / signal
Servo power (AC)	M12 S M12 K	S: 250V AC; K: 800V / 16A 3-phase	Servo systems, VFDs, drive power supply
Servo power (DC)	M12 T	12A / 250V DC	Drive DC bus, industrial motors
Encoder / bus	M12 D	4/5 pins · 360° shielding · IP67	EtherCAT / PROFINET, servo drive equipment

2. How to Select by Link

2.1 Motor body main plug: choose the M16 series

M16 is the standard aviation-plug form factor (16 mm thread). The official site explicitly lists it for "servo motors, encoders, robots" and similar scenarios. Its nickel-plated brass housing resists high and low temperatures, oil, and shock; rated IP67 (fully dust-tight, brief water immersion) with a V0 flame-retardant rating — matching the servo profile of "body heat + workshop oil + occasional washdown". Pin count spans 2–24, covering everything from simple 3-phase to complex wiring with brake and encoder.

2.2 Servo power: choose S / K / T by AC or DC

• S coding : up to 250V AC, with separated shielding to avoid power/signal crosstalk; dedicated to servo systems, drive motors, and VFD power.
• K coding : carries 3-phase AC, up to 800V / 16A, keyed anti-mismating; suited to high-power drive-to-motor 3-phase supply.
• T coding : DC 12A / 250V, keyed anti-misinsertion; suited to drive DC bus.

Rule of thumb: small servo power can use S / T; 3-phase high power should look at K first; if more control lines are needed or to unify with cabinet interfaces, the high-pin M16 is more flexible.

2.3 Encoder / communication: choose M12 D coding

Encoder feedback and EtherCAT / PROFINET buses are highly noise-sensitive. M12 D coding is 4 / 5 pins, Cat5e compatible, with 360° full shielding plus silicone seal — the official site names it for "servo drive equipment, robotic arms, AGV", making it the safe choice for servo communication links.

3. Three Things to Confirm When Selecting

• Pin count : count power phases + ground + brake + encoder lines first, then derive the pin count to avoid running short later.
• Temperature & sealing : standard rating -40~+85℃, IP67; if it must run above +85℃ long-term, go custom (see below).
• Mounting & termination : front / rear panel, straight / angled (90° saves space), solder / screw / pre-molded cable (pre-molded avoids field soldering and poor contact).

4. Reference Combination (by series)

For a "standard AC servo with brake and encoder", a typical combination is:

• Motor-end main plug : M16 series front-panel 2–24 pin male / female solder type, carrying power + brake + ground together.
• Servo power branch : M12 S coding front-panel 3–4 pin male / female solder type, taking 250V AC servo power.
• Encoder / bus : M12 D coding connector, linking drive and motor encoder feedback.
• Easy option : choose M16 series pre-molded cable (straight overmold or 90° angled), skipping field soldering.

Exact models can be confirmed by the Octopusconn technical team within the above series, based on actual pin count, mounting direction, and termination.