In industrial automation, switching power supply, instrumentation, PLC control and consumer electronics manufacturing, stable wire connection to printed circuit boards directly determines the service life and failure rate of finished equipment. Traditional direct soldering wires have obvious defects: difficult disassembly for maintenance, easy fracture under long-term vibration, and low mass production efficiency. Screw type PCB terminal blocks adopt screw compression locking structure, becoming the most mainstream mature wiring solution for PCB board power and signal transmission.
What Is Screw Type PCB Terminal Block?
Screw type PCB terminal block is a through-hole solder connector fixed on PCB circuit boards, relying on metal screws to compress and lock solid/stranded wires. Each pole is separated by independent insulating barrier to avoid cross-circuit short circuit risk.
Main mainstream series include KF, HB, DG, 15EDG, KF301, HB825, covering common pitch sizes: 3.5mm, 3.81mm, 5.0mm, 5.08mm, 8.25mm, 10.0mm.
Two core structural categories:
- Barrier Screw PCB Terminal Block: Integrated one-piece molding, fixed pole number, with/without transparent dust cover, single/middle/dual soldering feet options;
- Plug-in Screw PCB Terminal Block (KF/EDG Series): Separable header & plug, convenient for PCB pre-welding and offline wire harness assembly, widely used in equipment that needs frequent disassembly.
All conductive inserts are nickel-plated pure copper, high-end customized versions support gold plating for high-precision weak signal transmission, matching different current grades from 10A to 60A.
Core Advantages Of Screw Type PCB Terminal Blocks
1. Uniform Screw Clamping Force, Vibration-Proof Stable Connection
M3/M3.5/M4 standard anti-loosening steel screws provide consistent compression pressure on wire cores. After tightening, wires will not loosen or form poor contact under long-term mechanical vibration of motors, compressors and production lines. Unlike fragile solder joints that crack easily, screw clamp structure supports thousands of repeated wire replacement operations without damage.
2. UL94-V0 Flame Retardant Housing, High Safety Insulation
The plastic shell of our screw type PCB terminal block is made of high-quality PA66 nylon with UL94-V0 fire resistance rating, operating temperature range from -40℃ to +105℃. Independent barrier partition isolates adjacent live poles, effectively preventing electric leakage, short circuit and electric arc hazards in humid, dusty industrial cabinet environments.
3. Wide Wire Compatibility, Simple On-Site Operation
No special crimping tools required; only a standard screwdriver is needed for wiring and disassembly. Compatible with solid single-core wires and multi-strand flexible wires, wire range covers 0.2 ~ 14mm². Electricians and assembly workers can complete wiring in seconds, greatly improving production line harness processing efficiency compared with manual soldering.
4. Complete Specifications To Match Diversified PCB Layout
We supply full series screw PCB terminals with customizable parameters to fit all circuit board design demands:
- Pitch: 3.5 / 3.81 / 5.0 / 5.08 / 8.25 / 10.0mm
- Pole count: 2P ~ 24P freely customizable
- Structure: integrated barrier type / pluggable split type
- Soldering foot: single foot / middle foot / dual foot
- Color: standard black & green, custom gray, blue, orange available
- Accessories: transparent dust-proof protective cover, end baffle, marking label strip
Widely applied for inverter PCB, switching power supply board, industrial PLC control board, medical equipment circuit, new energy controller, elevator mainboard and household appliance control panel wiring.
5. Cost-Effective Mass Production Solution For Electronic Manufacturers
Standard modular design supports bulk wholesale and small sample trial orders. All our screw type PCB terminal blocks pass RoHS, REACH and CE international environmental certifications, fully meeting export inspection standards for EU, North America and Southeast Asia. Stable injection molding and electroplating processes reduce defective rates of finished electronic products and lower after-sales maintenance costs.
Standard Technical Parameters
- Rated Voltage: 300V / 500V / 600V AC (depends on pitch size)
- Rated Current: 10A ~ 60A
- Applicable Wire: 0.2 ~ 14mm² solid & stranded wire
- Housing Material: UL94-V0 Flame Retardant PA66 Nylon
- Conductor: Nickel-plated pure copper (gold plating optional)
- Mounting Method: PCB through-hole wave soldering / manual soldering
- Certification: RoHS, REACH, CE Compliant
Step-by-Step Installation Guide
- Insert the terminal’s soldering pins into reserved through holes of PCB circuit board;
- Complete wave soldering or manual soldering to fix the terminal block firmly on the board;
- Strip wire insulation to standard length, insert clean copper core into independent wiring cavity;
- Tighten the built-in screw clockwise to clamp wire tightly;
- For wire replacement, loosen screw counterclockwise and pull wire out directly without damaging PCB pads.
Why Choose Our Screw Type PCB Terminal Blocks?
We are professional wiring terminal manufacturer with complete stamping, injection molding and electroplating production lines. All our screw type PCB terminal blocks adopt thickened copper conductive inserts and thicker anti-rust tin/nickel coating than generic low-cost products on the market, extending service life under continuous full-load operation.
Precision injection molding without plastic burrs, clear model marking on shell for quick selection by engineers. We support custom pitch, pole number, soldering foot structure and surface plating according to customer PCB drawing files. Sufficient spot stock of standard models ensures fast global delivery, one-stop matching barrier terminals, DIN rail terminals and wiring accessories for electronic equipment manufacturers and electrical distributors.
Final Summary
Screw type PCB terminal block is an essential connection component for power and signal transmission on printed circuit boards. Featuring reliable anti-vibration screw clamp structure, flame retardant insulating shell, full-size specification options and convenient maintenance, these PCB wiring connectors replace unstable manual soldering and become the preferred wiring scheme for mass-produced industrial and consumer electronics. Selecting high-quality screw type PCB terminal blocks effectively improves circuit safety, long-term stability and production efficiency, and optimizes overall manufacturing costs for electronics factories.
Keywords: Screw Type PCB Terminal Block, Screw Clamp PCB Connector, PCB Barrier Terminal Block, Pluggable PCB Terminal, Copper PCB Wiring Connector