Custom Screw Terminal Block Manufacturer in China

We offer a robust selection of screw terminal blocks, known for their secure and reliable wire connections. Our range includes various pitches, orientations (horizontal, vertical), and pole configurations, making them ideal for diverse PCB applications. Designed for strong clamping force, these blocks ensure stable electrical performance, particularly in industrial controls, power supplies, and any application demanding durable and dependable wiring.

Linkwell Electrics - Your Trusted Screw Terminal Block Manufacturer from China

Linkwell Electrics is a trusted screw terminal block manufacturer from China, specializing in high-quality, reliable solutions. They offer a diverse range of screw terminal blocks, featuring various pitches, pole configurations, and mounting options for both PCB and DIN rail applications. Linkwell emphasizes robust designs and secure wire clamping, ensuring stable and durable electrical connections essential for industrial automation, power distribution, and other demanding projects worldwide.

Various Screw Terminal Block

wholesale screw terminal blocks

We offer a comprehensive range of screw terminal blocks, renowned for their robust and secure wire connections. Our selection includes various pitches (e.g., 2.54mm, 3.5mm, 5.08mm), orientations (horizontal, vertical, angled), and pole numbers to suit diverse PCB layouts. Ideal for applications requiring strong, reliable clamping, these blocks ensure stable electrical performance in industrial, power, and control systems.

PCB screw terminal block

We offer a comprehensive range of PCB screw terminal blocks, providing secure and reliable wire-to-board connections for your electronic designs. Our selection features various pitches (e.g., 2.54mm, 3.5mm, 5.08mm), orientations (horizontal, vertical, angled), and pole numbers to fit diverse layout requirements. Ideal for industrial, power, and control applications, these blocks ensure robust clamping and stable electrical performance.

din rail screw terminal block

We offer a comprehensive range of DIN rail screw terminal blocks, designed for secure and organized wiring in industrial control panels. Our selection includes various cross-sections, colors, and functionalities like feed-through, grounding, and multi-conductor blocks. These robust terminals ensure reliable connections and easy installation on standard DIN rails, optimizing space and simplifying wiring in demanding applications like automation, power distribution, and machinery.

pluggable screw terminal block

We offer versatile pluggable screw terminal blocks, providing both the reliability of screw connections and the convenience of quick disconnects. Our selection includes various pitches and pole counts, allowing for easy pre-wiring of harnesses and simplified field installation or replacement of modules. These blocks are ideal for applications requiring frequent mating/unmating, ensuring flexible and secure electrical connections on your PCBs.

panel mount screw terminal block

We offer a versatile range of panel mount screw terminal blocks, designed for direct and secure mounting onto equipment panels and enclosures. These blocks provide robust screw connections, ensuring stable and reliable wire terminations for external wiring. Available in various pole configurations and current ratings, they are ideal for industrial control panels, power distribution units, and machinery requiring easily accessible and organized electrical connections.

micro screw terminal block

We offer a specialized range of micro screw terminal blocks, perfect for high-density PCB layouts and compact electronic devices. These miniature blocks provide secure and reliable wire connections in extremely tight spaces, with pitches as small as 2.54mm or 3.5mm. Ideal for IoT devices, portable electronics, and any application where space-saving without compromising connection integrity is critical.

screw clamp terminal block

We offer a comprehensive range of screw clamp terminal blocks, designed for secure and highly reliable wire connections. These blocks utilize a robust screw-and-clamp mechanism to provide excellent vibration resistance and gas-tight connections. Available in various pitches, orientations, and pole numbers, they are ideal for demanding applications in industrial control, power distribution, and instrumentation where long-term stability and safety are paramount.

double row screw terminal block

We offer a comprehensive range of double row screw terminal blocks, providing high-density wiring solutions for your PCBs. These blocks maximize connections in a smaller footprint, ideal for complex circuits requiring numerous inputs or outputs. Available in various pitches and current ratings, they feature robust screw clamping for secure and reliable wire termination, ensuring stable performance in demanding applications.

screw connection terminal blocks

We offer a comprehensive range of screw connection terminal blocks, providing highly secure and reliable wire terminations for various applications. Our selection spans multiple pitches, current ratings, and mounting types including PCB-mountable and DIN-rail options. Designed for strong, vibration-resistant clamping, these blocks ensure stable electrical conductivity, making them ideal for industrial controls, power distribution, and other demanding environments where dependability is critical.

Why Choose Our Screw Terminal Block

Pitch and Number of Poles:

Customizing the pitch (distance between screw centers) ensures compatibility with your PCB layout or spacing requirements. You can specify the exact number of poles (connections) needed for your application, from single terminals to multi-way blocks. This allows for optimized space utilization and precise configuration, preventing unnecessary bulk or insufficient connection points.

Mounting Type and Orientation:

Tailor the mounting method to your assembly. Options include PCB-mountable (through-hole for direct board soldering, or SMT for automated placement), DIN-rail mount for industrial panels, or panel mount. The orientation (horizontal, vertical, or angled) can also be customized to optimize wire routing and accessibility within your enclosure, improving overall system ergonomics.

Housing Material and Color:

Customize the housing material to meet specific environmental demands, such as high-temperature resistance, UV stability, or flame retardancy (e.g., UL94 V-0). The color of the housing can also be specified. This allows for color-coding different circuits for easier identification, enhancing safety and speeding up maintenance or troubleshooting processes.

Contact Plating and Screw Type:

Specify the plating material for the metal contacts (e.g., tin, nickel, silver) to optimize conductivity, corrosion resistance, and lifespan for your application’s current and environmental conditions. Additionally, choose the screw type (e.g., slotted, Phillips, combination head) for compatibility with common tooling and ease of wiring during assembly and field servicing.

what are screw terminal blocks?

A screw terminal block is a fundamental electrical connector that uses a screw mechanism to secure a wire against a conductive metal part, thereby establishing an electrical connection.

It typically consists of an insulating housing, made of plastic, with internal metal clamps or plates. When a stripped wire is inserted into the terminal’s opening and the screw is tightened, the screw exerts pressure, clamping the wire firmly against the conductive element.

This creates a robust and reliable connection that is resistant to vibration and pull-out, making screw terminal blocks a popular choice for applications requiring secure and semi-permanent wire terminations, ranging from industrial control panels to consumer electronics.

how to use screw terminal block?

Using a screw terminal block is a straightforward process that ensures a secure electrical connection.

Here’s how to to use a screw terminal block in the following:

Prepare the Wire: First, carefully strip about 5-10mm (0.2-0.4 inches) of insulation from the end of the wire you intend to connect. Ensure the copper strands are clean and untwisted. For stranded wires, twisting the strands together or using a ferrule can prevent stray strands and improve the connection.
Loosen the Screw: Using an appropriately sized screwdriver (usually a flat-head or Phillips), loosen the screw on the terminal block. You don’t need to remove it completely, just loosen it enough so that the wire entry clamp opens sufficiently.
Insert the Wire: Insert the stripped end of the wire fully into the opening beneath the loosened screw, ensuring no bare wire is exposed outside the terminal block’s housing once connected, and that all strands are inside.
Tighten the Screw: While holding the wire in place, firmly tighten the screw with the screwdriver. The screw will press down on a metal clamp or plate, securing the wire against the current bar. Avoid over-tightening, as this can damage the wire or the terminal block.
Verify Connection: Gently tug on the wire to confirm it is securely held and cannot be easily pulled out. This ensures a reliable electrical connection.

how to use screwless terminal blocks?

Using screwless terminal blocks offers a quick and often tool-free method for making secure electrical connections. The specific steps can vary slightly depending on the design (e.g., push-in, lever-actuated), but the general principle is to open a clamping mechanism, insert the wire, and then release the mechanism to secure it.

Prepare the Wire: Strip the insulation from the wire end to the length specified by the terminal block manufacturer, typically around 8-10mm. For stranded wires, twisting the strands or using a ferrule can prevent fraying and ensure a more reliable connection, though many screwless designs are excellent with fine-stranded wires directly.
Open the Clamping Unit:
- For Push-in types: For solid wires or stranded wires with ferrules, you often just push the wire directly into the opening until it stops. For fine-stranded wires without ferrules, you might need to use a small screwdriver or a dedicated tool to depress a small button or lever, which opens the internal clamping spring.
- For Lever/Button types: Depress the button or lift the lever firmly to open the internal clamping mechanism, exposing the wire entry hole.
Insert the Wire: Fully insert the stripped end of the wire into the designated opening until it hits the back stop. Ensure no bare conductor is exposed outside the terminal block’s housing after insertion.
Secure the Wire:
- For Push-in types: If you pushed the wire in directly, it’s already secured. If you used a tool to open the clamp, remove the tool to allow the spring to clamp the wire.
- For Lever/Button types: Release the button or push the lever back down to its closed position. The internal spring mechanism will then securely clamp the wire.
Verify Connection: Gently pull on the wire to confirm it is firmly held and cannot be easily dislodged. This verifies a good electrical and mechanical connection.

How to choose screw terminal blocks?

Choosing the right screw terminal block is crucial for ensuring the safety, reliability, and long-term performance of your electrical connections.

Here are the key factors to consider for you to select the right screw terminal blocks:

Electrical Ratings (Current and Voltage): The most critical aspect is to select a screw terminal block with current and voltage ratings that meet or exceed the maximum anticipated electrical load of your application. It’s good practice to choose a block rated for at least 150% of your system’s expected maximum current to account for potential surges or continuous operation, preventing overheating and damage. Also, ensure the voltage rating is higher than your system’s maximum voltage to prevent insulation breakdown.
Wire Size and Type Compatibility: Screw terminal blocks are designed to accommodate specific wire gauges (AWG or mm²). You must match the terminal block’s accepted wire range with the wires you intend to use. While screw terminals are generally versatile, working well with both solid and stranded wires, using ferrules for stranded wires can significantly improve the connection’s reliability and prevent fraying over time.
Number of Poles and Pitch: Determine how many individual electrical connections (poles) you need for your circuit. Screw terminal blocks come in various pole counts, from single connections to multi-pole configurations. The “pitch” refers to the distance between the center of one pole and the next. This is important for ensuring compatibility with your PCB layout and for maintaining adequate creepage and clearance distances, especially for higher voltages.
Mounting Type and Orientation: Consider how the terminal block will be mounted. Common types include PCB-mountable (through-hole or surface-mount), DIN rail mount for industrial panels, or panel mount. The orientation (horizontal, vertical, or angled) is also critical for efficient wiring, accessibility for maintenance, and fitting within the available space in your enclosure.
Environmental Conditions and Safety Certifications: Assess the environment where the terminal block will operate. Factors like extreme temperatures, humidity, vibration, and exposure to chemicals can impact performance. Choose materials (e.g., housing plastics, contact metals) that are suitable for these conditions. Always ensure the chosen screw terminal block complies with relevant safety standards and certifications (e.g., UL, IEC) required for your application and region, as this ensures both safety and regulatory compliance.

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All-in-one Screw Terminal Block Solutions for Your Project

We provide all-in-one screw terminal block solutions engineered for diverse project needs. Our extensive selection covers a wide range of pitches, from compact to high-power, and various pole configurations to fit any circuit requirement. With options for PCB-mounting or DIN-rail applications, our robust screw terminal blocks ensure highly secure, vibration-resistant connections, simplifying wiring and enhancing reliability for industrial, commercial, and consumer electronics projects.