M40 Connectors

M40 Connectors

Features

Series: M Series circular connector
Model: M40 high-power industrial connector
Standard layouts in stock: 4-pin pure power, 6-pin (2+3+PE), 8-pin (4+3+PE) hybrid. Custom non-standard pin counts and exclusive power-signal mixed layouts are available for special equipment.
Matched male plug and female receptacle. Two installation options: field-wireable cable plug and panel-mount receptacle (square flange or round thread mount).
Handles heavy electrical loads, rated up to 75A and 630V. Custom 800V high-voltage versions are optional.
Compliant with DIN EN 61984 and UL 2237, compatible with most mainstream automation and servo brands.
High-strength nickel-plated brass and zinc alloy housing resists strong impact, long-term high-frequency vibration, and cable pull force.
Comprehensive shielding blocks electromagnetic interference from high-current circuits and maintains stable motor signal feedback.
Standard IP67 waterproof and dustproof. Upgraded IP68 optional for tight sealing against dust, moisture, coolant, hydraulic oil, and high-pressure washing.
Low-resistance gold-plated copper alloy contacts reduce power loss and heat buildup during long-duration high-load operation.
Supports crimp and screw terminals for convenient on-site wiring, maintenance, and custom harness production.

M40 Connector for High-Power Industrial Applications

What Is an M40 Connector?

M40 connectors are heavy-duty circular connectors built for harsh industrial working conditions. They deliver steady power transmission, robust locking performance and long-term reliability for servo motors, industrial drives, automated production lines and heavy machinery.

Our M40 series includes pure power and hybrid integrated styles. This dual design lets users run single power delivery, independent signal feedback, or simultaneous power-and-signal transmission within one connector housing.

Core Advantages of Our M40 Connectors

Supports High-Current & High-Voltage Power Transmission

M40 connectors carry large current and withstand high voltage loads effortlessly. They fit perfectly with large servo motors, industrial inverters and centralized power distribution equipment.

Excellent Mechanical Toughness

Thickened metal housings and standard threaded locking structures defend against intense vibration, sudden impact and cable pull force. The connection stays tight and stable even in continuously vibrating workshop environments.

Accommodates Large-Diameter Cables

M40 models reserve ample internal space for thick wire gauges and wide-diameter cables. Larger conductors cut circuit resistance effectively and raise the overall connection safety for high-power equipment.

Reliable Threaded Locking Mechanism

The standard M40×1.5 threaded coupling locks two halves firmly together. It eliminates loose contacts caused by long-term machine operation and frequent equipment movement.

Multi-Level Waterproof & Dustproof Protection

We supply M40 connectors with IP67 and optional IP68 protection grades. These ratings block dust, splashing water and humid air to maintain consistent performance outdoors or in wet processing workshops.

Complete M40 Connector Types

We maintain a full lineup of high-performance M40 circular connectors to cover all industrial wiring, servo power connection and on-site assembly demands. Every unit adopts M40×1.5 threaded locking, IP67 baseline sealing and full EMI shielding. This design guarantees interference-free power and signal transfer across automated equipment, servo motors and heavy-duty machinery.

Classified by Core Pin Count (Standard & Custom Available)

Our standard M40 range covers mainstream pin layouts to match different power loads and signal control demands. We also offer full customization for non-standard pin configurations to meet unique special equipment requirements:

4-pin M40 connectors: Pure high-current power type, ideal for basic servo power supply and main circuit wiring of general industrial devices
6-pin M40 connectors: Hybrid layout with thick power pins and thin signal pins. It simultaneously transmits motor power, brake signals and grounding, making it the most universal option for standard servo systems
8-pin M40 connectors: Upgraded hybrid power-signal design. It handles multi-channel signal feedback and complex connection logic for high-power servo equipment
Custom pin layouts: We develop tailor-made connectors with non-standard 3-pin, 5-pin, 9-pin and other special pin counts. Our engineering team also designs exclusive power-signal mixing arrangements based on your equipment technical drawings.

Classified by Cable Outlet Angle

We provide two mainstream outlet styles to fit different installation spaces and mechanical structures:

Straight M40 connectors: Straight cable outlet design. It works well for installations with sufficient wiring room and creates tidy internal wiring layouts inside equipment cabinets
Right Angle M40 connectors: 90-degree bent outlet. This design solves space limits at motor tails, equipment side panels and compact mechanical assemblies.

Classified by Connector Gender

We stock complete matched male and female sets for seamless plug-and-receptacle docking:

Male M40 connectors (Pin Side): Installed on loose cable plugs or movable connection terminals
Female M40 connectors (Socket Side): Mounted on fixed equipment ends to pair with male plugs.

Classified by Installation & Wiring Style

We offer two primary installation forms to satisfy mass factory assembly and rapid on-site maintenance separately:

Field Wireable Cable Plugs: End-users conduct wiring on site. We support crimp terminals and screw terminals for flexible field wiring, equipment maintenance and custom harness production
Panel Mount Receptacles: Fixed flange type with square flanges or round thread mounts. It locks firmly onto motor shells, equipment control cabinets and operation panels for permanent long-term docking.

M40 Connector Standard Specifications

Parameter	Detailed Specification
Series Category	M Series Circular Industrial Connector
Product Model	M40 Heavy-Duty Connector
Contact Layout	4Pin / 6Pin / 8Pin / Custom Hybrid Layouts
Cable Orientation	Straight / Right Angle 90°
Gender Version	Male Plug / Female Receptacle
Mounting Style	Field Wireable Cable Plug / Panel Mount Receptacle
Compatible Cable	Supports large-diameter thick power cables
Operating Temperature	-40°C ~ +130°C
Rated Voltage	Up to 630V (Higher customized voltage available)
Rated Current	Max 55A / 75A (Depends on pin configuration)
Contact Resistance	Ultra-low contact resistance design
Insulation Property	High insulation resistance for safety
Ingress Protection	Standard IP67; Optional upgraded IP68
Locking Method	Standard M40×1.5 Threaded Lock; Quick-Lock Optional
Housing Material	Durable metal shielding housing as standard
Mating Lifespan	Long service mating cycles (Customizable)
Global Certifications	CE, RoHS, UL, VDE (Depends on selected version)

Wide Application Scenarios for M40 Connectors

M40 connectors deliver stable, waterproof and vibration-proof connections for all high-power industrial equipment:

Large high-power servo motors
Industrial drives & frequency converters
Heavy-duty construction & mining machinery
CNC machining centers & automated production lines
Wind power generation equipment
Energy storage power distribution systems

Why Choose Our M40 Industrial Connectors?

We are Huada, a professional industrial connector manufacturer supplying customized connection solutions for global industrial buyers. We integrate independent R&D, standardized production and strict quality testing to stabilize product performance while supporting flexible personalized modifications.

Beyond finished products, our team provides full technical support, custom drawing development and one-on-one project follow-up. We help customers select the most suitable M40 connector model quickly, simplify your procurement flow and cut overall project costs.

We combine complete standard specifications with flexible one-stop customization services. Our M40 connectors cover all low-to-high power industrial connection scenarios. Every product resists vibration, oil contamination, dust and water erosion. The series matches most mainstream servo motor and automation equipment brands, delivering cost-effective, long-lasting wiring solutions to industrial clients worldwide.

FAQ

1. What do manufacturers use M40 connectors for?

M40 connectors target heavy industrial high-power equipment, including servo motors, industrial inverters, CNC machine tools and large heavy machinery.

2. Are M40 connectors waterproof?

Our standard M40 connectors carry IP67 waterproof and dustproof ratings. We also supply upgraded IP68 versions for fully submerged or extremely humid working environments.

3. What separates pure power M40 connectors from hybrid M40 connectors?

Pure power connectors only transmit high-current power loads. Hybrid M40 connectors integrate power pins and signal pins within one housing to transfer power and feedback signals simultaneously.

4. Can I install M40 connectors on servo motors?

Absolutely. M40 connectors rank among the most common matching connectors for high-power servo motors, thanks to their high current capacity and anti-vibration threaded locking design.

5. What pin options can I get for M40 connectors?

Our standard stock includes 4-pin, 6-pin and 8-pin hybrid layouts. We also accept custom orders for special non-standard pin counts and mixed power-signal layouts.