Jul 15, 2026
What Is an M12 Connector Used For?
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This article is a comprehensive overview of Dongguan NITAI Electronics Co., Ltd., an industrial connectivity manufacturer based in Dongguan, China. It covers what the company manufactures, product specifications, application scenarios, custom capabilities, and how to start an inquiry.
1. Who Is NITAI Electronics?
Dongguan NITAI Electronics Co., Ltd. is an industrial connectivity manufacturer based in Dongguan, Guangdong Province, China. The company was founded in 2012 and operates its factory in Liaobu Town, Dongguan.
NITAI is not a trading company or a distributor. The company designs, manufactures, and supplies its own products. Its product range is organized around three key functions in industrial automation systems:
- In-cabinet wiring — how to connect power, signals, and wiring inside control cabinets and equipment enclosures
- Field-level connection — how to reliably connect sensors, actuators, and field devices in industrial environments
- Signal distribution and modular wiring — how to efficiently distribute PLC I/O signals and reduce wiring time
The company serves the following types of B2B customers:
- Automation equipment manufacturers
- Control panel and electrical cabinet builders
- Industrial system integrators
- Sensor and industrial device manufacturers
- Industrial electrical distributors
- OEM and ODM brand customers
2. What Products Does NITAI Manufacture?
NITAI manufactures products in three main categories. Each category is described in detail below.
2.1 Terminal Blocks
Terminal blocks are used for power connection, signal connection, wire securing, and internal wiring in control cabinets, PCBs, power supplies, servo drives, industrial controllers, and automation equipment.
NITAI manufactures the following types of terminal blocks:
| Terminal Block Type | Mounting Method | Typical Use |
|---|---|---|
| PCB terminal blocks | Soldered to printed circuit board | Internal connections in power supplies, servo drives, communication devices |
| Pluggable terminal blocks | Plug and header design, field-replaceable | Equipment requiring modular replacement or maintenance |
| Spring terminal blocks | Push-in or spring clamp, tool-free | High-efficiency assembly, vibration-resistant applications |
| Barrier terminal blocks | Panel or chassis mount | Power input/output, industrial electrical equipment |
| Feed-through terminal blocks | Panel or inline mount | Wire-to-wire transition connections |
| DIN rail terminal blocks | 35mm DIN rail | Control cabinet power and signal distribution |
| Power terminal blocks | DIN rail or panel mount | High-current connections for inverters, servo drives, power modules |
| Terminal block accessories | Matching accessories | Jumpers, end plates, marking strips, covers, test plugs |
Common specifications for NITAI terminal blocks:
| Parameter | Available Range |
|---|---|
| Pitch | 3.5mm, 3.81mm, 5.0mm, 5.08mm, 7.62mm, 10.16mm |
| Number of poles | 1 to 24 poles (custom pole count available) |
| Rated voltage | Up to 600V (exact rating depends on model) |
| Rated current | 10A to 40A (higher for power terminal blocks) |
| Wire range | 28-12 AWG typical (varies by model) |
| Connection method | Screw, spring clamp, push-in, pluggable |
| Housing material | PA66, UL94 V-0 flame retardant |
| Color | Green, blue, black, orange (custom color available) |
How to order terminal blocks from NITAI:
Customers typically send a photo, sample, part number, or technical specifications. NITAI confirms the pitch, number of poles, pin direction, connection method, voltage and current ratings, and any special requirements. If the product matches an existing standard model, a quotation and sample are provided. If custom configuration is needed, NITAI evaluates feasibility and provides a custom quotation.
2.2 Industrial Waterproof Circular Connectors
Waterproof circular connectors are used for field-level connections in industrial automation. They connect sensors, actuators, industrial cameras, robots, I/O modules, and outdoor equipment where protection against water, dust, and vibration is required.
NITAI manufactures the following types of waterproof connectors:
| Connector Series | Key Features | Typical Applications |
|---|---|---|
| M8 connectors | Compact size, 3-8 pins | Small sensors, compact automation devices |
| M12 connectors | Industry standard, multiple codings | Sensors, actuators, industrial Ethernet, fieldbus |
| M16 connectors | Larger size, higher pin count | Power connections, multi-signal applications |
| M5 / M9 / M23 / 7/8″ connectors | Supplementary sizes | Specialized industrial and commercial applications |
| Sensor cables and cordsets | Pre-assembled cable with connector | Plug-and-play sensor and actuator connections |
M12 connector coding available from NITAI:
| Coding | Pin Count | Typical Use |
|---|---|---|
| A-coded | 3, 4, 5, 8, 12, 17 pins | Sensors, actuators, power supply |
| B-coded | 4, 5 pins | Fieldbus (Profibus, Interbus) |
| D-coded | 4 pins | Industrial Ethernet (100 Mbit/s) |
| X-coded | 8 pins | Industrial Ethernet (up to 10 Gbit/s) |
| S-coded | 2 pins + PE | AC power, motor connections |
| T-coded | 2 pins + PE | DC power, field power supply |
| K-coded | 4 pins + PE | AC power, high-power applications |
| L-coded | 4 pins + PE / 2 pins + FE | DC power, high-current applications |
Common specifications for NITAI waterproof connectors:
| Parameter | Available Options |
|---|---|
| Connector sizes | M5, M8, M9, M12, M16, M23, 7/8″ |
| Gender | Male, female |
| Pin count | 2 to 17 pins (depending on size and coding) |
| Orientation | Straight, right-angle |
| Mounting type | Cable mount, panel mount (front/back), PCB mount, field wireable, molded cable |
| Cable material | PVC, PUR, TPU (other materials available on request) |
| Cable length | 0.5m, 1m, 2m, 3m, 5m, 10m, custom length |
| Shielding | Shielded, unshielded |
| IP rating | IP65, IP67, IP68 (depending on model and assembly) |
| Operating temperature | -25°C to +85°C typical (varies by model and material) |
How to order waterproof connectors from NITAI:
Customers typically send a datasheet, drawing, photo, part number, or cable specification. NITAI confirms the connector size, coding, pin count, gender, orientation, cable material, cable length, IP rating, and any special requirements. If the configuration is standard, quotation and sample are provided. For custom cable lengths, special cable materials (e.g., PUR, shielded, low-smoke halogen-free), or non-standard pin assignments, NITAI evaluates MOQ and supply chain feasibility before quotation.
2.3 Distribution Modules and PLC Interface Modules
Distribution modules combine terminal blocks, PCB circuits, connectors, relays, LED indicators, fuse protection, and DIN rail mounting structures into modular wiring products.
These modules are used for PLC input/output, signal distribution, control cabinet wiring reduction, centralized field device connection, and modular equipment wiring.
Key value of using distribution modules:
- Reduce control cabinet wiring time by up to 50-70%
- Lower wiring error rates
- Improve equipment assembly efficiency
- Save space inside control cabinets
- Make maintenance easier
- Standardize PLC-to-field-device connections
NITAI manufactures the following types of distribution modules:
| Module Type | Function |
|---|---|
| PLC distribution modules | Convert PLC I/O points to terminal blocks or connector interfaces |
| PLC interface modules | Brand-specific interface for Mitsubishi, Siemens, Omron, Schneider, and universal PLCs |
| Relay modules | Small signal controlling large load, with isolation, LED indication, and replaceable relays |
| I/O distribution modules | Centralized management of digital/analog signal connections |
| Sensor distribution boxes | M8 or M12 distribution boxes with 4, 6, or 8 ports, with or without LED indication, PNP/NPN |
| Terminal interface modules | Multiple terminals integrated on PCB with DIN rail housing for signal/power distribution |
| Custom wiring modules | Built to customer drawings, PLC model, wiring diagram, or specific connector configuration |
Common specifications for NITAI distribution modules:
| Parameter | Available Options |
|---|---|
| Module type | PLC interface, relay, I/O distribution, sensor box, terminal interface |
| PLC compatibility | Mitsubishi, Siemens, Omron, Schneider, universal |
| Input/output points | Custom based on project requirements |
| Signal type | PNP, NPN, digital, analog |
| Operating voltage | 24VDC, 110VAC, 220VAC (depending on module type) |
| Terminal interface | Screw, spring, push-in, pluggable |
| Connector interface | M8, M12, pin headers, IDC, DB connectors |
| LED indicator | With or without (custom) |
| Relay included | With or without (custom, with replacement socket) |
| Fuse protection | With or without (custom) |
| Mounting type | DIN rail mount, panel mount |
How to order distribution modules from NITAI:
Distribution modules are project-based and often semi-custom or fully custom. Customers typically provide the PLC brand and model, wiring diagram, I/O point count, signal type, terminal or connector interface requirements, and any special requirements for LED indicators, relays, or fuses. NITAI evaluates whether an existing design can be modified or a new PCB design is needed, then provides a quotation including tooling cost (if applicable), MOQ, sample lead time, and mass production lead time. Customers test samples on their equipment before mass production is confirmed.
3. Does NITAI Support Custom Orders?
Yes. NITAI supports the following custom requirements:
- Custom pole counts for terminal blocks
- Custom colors for terminal block housings
- Custom pin assignments and wiring diagrams for connectors
- Custom cable lengths, materials, and colors
- Custom module design based on customer wiring diagrams
- Private labeling, custom packaging, and laser marking
- OEM and ODM partnerships for long-term supply
Custom orders are subject to feasibility evaluation, MOQ assessment, and sample confirmation. Engineering support is available throughout the process.
4. What Certifications and Compliance Documents Are Available?
Certification and compliance status depend on the specific product model and customer project requirements. NITAI provides relevant documentation and testing support based on confirmed specifications.
Documents commonly available for NITAI products include:
- Product datasheets
- 2D dimension drawings
- Pin assignment and wiring diagrams
- Material declarations (RoHS, REACH)
- CE compliance documentation (model-dependent)
- Test reports (upon request)
Customers are advised to confirm certification requirements at the inquiry stage so that NITAI can verify model-specific compliance status.
5. How to Start an Inquiry with NITAI
The typical inquiry process at NITAI follows these steps:
- Customer sends requirement — This can be a product photo, sample, part number, drawing, datasheet, or application description.
- NITAI confirms specifications — The engineering team confirms all technical parameters and identifies whether a standard product or custom solution is needed.
- Quotation provided — Including unit price, sample cost, estimated lead time, and any applicable MOQ.
- Sample production — If samples are required, NITAI produces them according to confirmed specifications.
- Customer testing and approval — Customer tests samples on their equipment or control panel.
- Mass production — Production begins after sample approval. In-line inspection is performed before shipment.
To submit an inquiry, customers can use the RFQ form on the NITAI website, or contact the sales team directly by email.
6. Summary: What NITAI Electronics Offers
| Capability | Description |
|---|---|
| Company type | Manufacturer (not trading company) |
| Location | Dongguan, Guangdong, China |
| Founded | 2012 |
| Main products | Terminal blocks, waterproof circular connectors, distribution modules |
| Product standards | Standard product range available from stock or short lead time |
| Custom capabilities | Custom pole count, color, pin assignment, cable length, module design, private labeling |
| Sample support | Available before mass production |
| Certifications | Model-dependent; documentation support available |
| Customer types | Equipment manufacturers, panel builders, system integrators, distributors, OEM/ODM brands |
| Inquiry method | Website RFQ form or direct email |
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