Pre-Fitted Screw Terminal Clamp
Products Description
A pre-fitted screw terminal clamp is an electrical fastening assembly that pre-assembles screws, terminal blocks, washers, or related conductive connection structures. The product is typically installed inside electrical switches or wiring structures, securing wires and establishing conductive connections by tightening the screws.
Its core functions include:
Securing external wires
Providing a stable conductive path
Improving wiring reliability
Reducing contact resistance
Enhancing assembly efficiency
Optimising terminal electrical safety
In many electrical terminal products, wiring structures often need to withstand long-term current loads, mechanical vibrations, frequent wiring, and temperature variations; therefore, the material stability and structural design of the terminal block assembly are particularly critical.
Differentiated Design Advantages: Born for Automated Electrical Assembly
| Anti-Drop & Stopping Design | A miniature locking step is added to the pressure clamp terminal block. When the end user loosens the screw in the opposite direction on-site to insert a larger diameter wire, the screw automatically locks at the limit position, ensuring it will never fall off the junction box and be lost, significantly improving the on-site installation experience. |
| Optimised Screw Tips | Depending on the type of external wire (single-strand hard wire or multi-strand soft copper wire), we offer spherical end faces, flat-headed chamfered end faces, or Wire Clamp Terminal with Screw end face designs with movable clamps. This prevents the screw tip from cutting or damaging delicate copper strands during tightening. |
| Optimised geometric taper | The outline of the junction box has been slightly tapered to conform to the standard slots of mainstream switches and circuit breakers worldwide (such as ABB, Siemens, and Schneider). When the robotic arm picks up and places the components on the automated assembly line, the components can slide into the plastic housing by self-guidance, achieving a slot alignment success rate of 99.99%. |
Material Advantages
Brass Frame (C2680/C2700)
Copper-zinc alloys combine excellent cold-stamping formability, moderate conductivity, and good atmospheric corrosion resistance.
Copper Alloy Screws (H62/H65)
For high conductivity requirements or all-copper connections, using brass screws with the same material as the brass frame eliminates the risk of galvanic corrosion and reduces contact resistance.
Carbon Steel Screws (1022A/10B21)
For high torque, large wire diameter, or vibration environments (such as moulded case circuit breakers), carbon steel screws offer significantly higher tensile and shear strength than copper alloys.
Stainless steel screws (A2-70/A4-70)
Designed for outdoor or high-humidity applications such as photovoltaic fuses, austenitic Cage Clamp Screw Terminals offer excellent resistance to salt spray and chemical corrosion, forming a long-lasting corrosion protection system when combined with a tin-plated brass frame.
Production Process Flow
Cold Heading: The bar stock undergoes sequential cutting, head pre-forming, skeining, head finishing, and edge trimming processes via a multi-station cold heading machine, forming a Integrated Screw Clamp Terminal blank in one step.
Tapping: Precision tapping is performed on the threaded holes of the Galvanized Steel Screw Terminal Clamp to ensure thread accuracy and surface finish.
Surface Treatment: Tin plating, nickel plating, or zinc plating is performed according to customer requirements, and corrosion resistance is verified through salt spray testing.
Screw Cold Heading and Heat Treatment: After cold heading, the screw body undergoes heat treatment to obtain the required hardness and torque characteristics.
Automatic Pre-assembly: In a cleanroom, an automatic feeding system precisely feeds the screws into the threaded holes of the Circuit Breaker Screw Clamp Terminal, a robotic arm performs pre-tightening, and a high-precision torque sensor calibrates the pre-tightening force.
Full Inspection and Packaging: 100% visual inspection of equipment checks the assembly integrity. After random checks of torque values and thread quality, the screws are packaged and shipped according to customer requirements.
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We not only provide standardised Terminal Block Hand Screw products, but also offer integrated engineering solutions based on customers' electrical structures, automated assembly methods, and end-application environments, from structural development and mould manufacturing to mass production, helping projects achieve more stable and efficient long-term mass production applications.
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