What are the common sizes of PCB screw type connectors?
Sep 11, 2025
As a supplier of PCB screw type connectors, I often encounter inquiries about the common sizes of these essential components. PCB screw type connectors are widely used in various electrical and electronic applications due to their reliability, ease of installation, and flexibility. In this blog post, I will delve into the common sizes of PCB screw type connectors, their applications, and how they can benefit your projects.
Understanding PCB Screw Type Connectors
PCB screw type connectors, also known as PCB screw terminal blocks, are used to connect wires to a printed circuit board (PCB). They consist of a housing, a screw, and a terminal block. The screw is used to secure the wire in place, providing a reliable electrical connection. These connectors are available in a variety of sizes, configurations, and terminal counts to meet the diverse needs of different applications.
Common Sizes of PCB Screw Type Connectors
The size of a PCB screw type connector is typically determined by its pitch, which is the distance between the centers of adjacent terminals. The most common pitches for PCB screw type connectors are 2.54mm, 3.5mm, 5.08mm, and 7.5mm. Let's take a closer look at each of these sizes and their applications.
2.54mm Pitch
The 2.54mm pitch is one of the most widely used sizes for PCB screw type connectors. It is commonly used in applications where space is limited, such as in consumer electronics, telecommunications equipment, and industrial control systems. The 2.54mm pitch allows for a high density of terminals on the PCB, making it suitable for applications that require a large number of connections.
PCB YB ELECTRIC SCREW TERMINAL BLOCK is an example of a 2.54mm pitch PCB screw type connector. It offers a compact design and reliable performance, making it ideal for a wide range of applications.
3.5mm Pitch
The 3.5mm pitch is another popular size for PCB screw type connectors. It provides a good balance between space utilization and current-carrying capacity. The 3.5mm pitch is commonly used in applications where a moderate number of connections are required, such as in power supplies, lighting fixtures, and automotive electronics.
pcb screw terminal block with a 3.5mm pitch is a versatile option that can be used in various applications. It offers a reliable electrical connection and easy installation, making it a popular choice among designers and engineers.
5.08mm Pitch
The 5.08mm pitch is a larger size that is commonly used in applications where higher current-carrying capacity is required. It is often used in power distribution systems, industrial machinery, and heavy-duty equipment. The 5.08mm pitch allows for larger wire sizes to be used, which can handle higher currents without overheating.
PCB SCREW TERMINAL BLOCK with a 5.08mm pitch is designed to meet the demands of high-power applications. It offers a robust construction and reliable performance, ensuring a safe and efficient electrical connection.
7.5mm Pitch
The 7.5mm pitch is the largest size among the common PCB screw type connectors. It is typically used in applications where very high current-carrying capacity is required, such as in large power transformers, industrial generators, and high-voltage switchgear. The 7.5mm pitch allows for the use of even larger wire sizes, which can handle extremely high currents.
Factors to Consider When Choosing the Right Size
When choosing the right size of PCB screw type connector for your application, there are several factors to consider. These include:
- Current-carrying capacity: The size of the connector should be able to handle the current requirements of your application without overheating. Larger pitch connectors generally have a higher current-carrying capacity.
- Space limitations: If space is limited, you may need to choose a smaller pitch connector to fit the available space on the PCB.
- Number of connections: Consider the number of connections you need to make and choose a connector with an appropriate number of terminals.
- Wire size: The size of the wire you are using will also affect the choice of connector. Make sure the connector is compatible with the wire size you are using.
Benefits of Using PCB Screw Type Connectors
PCB screw type connectors offer several benefits over other types of connectors, including:
- Reliability: The screw connection provides a secure and reliable electrical connection that is less likely to come loose over time.
- Ease of installation: Screw type connectors are easy to install and remove, making them ideal for applications that require frequent maintenance or changes.
- Flexibility: These connectors can be used with a variety of wire sizes and types, providing flexibility in design and installation.
- Cost-effective: PCB screw type connectors are generally more cost-effective than other types of connectors, making them a popular choice for many applications.
Conclusion
In conclusion, the common sizes of PCB screw type connectors include 2.54mm, 3.5mm, 5.08mm, and 7.5mm pitches. Each size has its own advantages and is suitable for different applications. When choosing the right size of connector, it is important to consider factors such as current-carrying capacity, space limitations, number of connections, and wire size.
As a supplier of PCB screw type connectors, we offer a wide range of sizes and configurations to meet the diverse needs of our customers. If you have any questions or need assistance in choosing the right connector for your application, please feel free to contact us. We are here to help you find the best solution for your project.
References
- Manufacturer's datasheets for PCB screw type connectors
- Industry standards and specifications for electrical connectors