High-Volume, High-Precision SMT & THT Assembly in Europe  ​

SMT assembling

11 lines (JUKI, Yamaha, Samsung) - 1 585 400CPH. Component size - 0201metric~50x150mm, H 28mm. M ax PCB size - 570x490. Reflow ovens - 11 zones, in air or N2. QC - SPI+AOI 100% control in lines, QR traceability, IPC 610


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THT assembling

Radial component inserters. Semi-automatic and manual soldering. Wave soldering in nitrogen environment. IPC 610

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Final assembly

Six manufacturing workshops for mass production, staffed by experienced professionals, handle final assembly, testing and packaging with precision and care. IPC 610

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Prototyping

Manufacturing of single PCBs with the use of a engraving machine. SMT line with high-speed paste dispensers. 3D printing with a wide range materials. Rework station BGA

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SMT assembling

Advantages at 4S4 Production

At 4S4 Production, we operate 11 state-of-the-art SMT lines with a total capacity of 1.58 million CPH, ensuring fast, reliable, and cost-efficient PCB assembly for projects of any scale.

  • High-Speed Precision – JUKI, YAMAHA, and SAMSUNG placement machines with advanced reflow ovens deliver consistent quality at industrial volumes.

  • Comprehensive Process Control – Automated solder paste inspection, AOI, and barcode verification guarantee 100% accuracy and traceability.

  • Flexibility for Every Project – From prototypes and small batches to high-volume production, we adapt capacity and technology to your needs.

  • Advanced Coating & Protection – Automated conformal coating lines provide long-term reliability under demanding conditions.

  • Integrated THT & Final Assembly – SMT workshops are seamlessly connected with THT soldering, functional testing, and final assembly, offering full-cycle production under one roof.

  • Certified Quality – All processes comply with IPC-A-610 and ISO standards (9001, 14001, 27001, 45001, 50001).

With speed, scale, and certified quality, our SMT workshops are the ideal partner for companies in Europe & seeking to localize or expand electronics production in Europe

Metal & Mechanical processing

Laser cutting and engraving of acrylic

  • Achieve exceptional cutting precision—up to 0.1 mm accuracy—with no heat-induced deformation

  • Process large acrylic sheets (up to 1400×2300 mm) with ease

  • Intricate engraving for stunning designs & light-conducting surfaces

  • Fast, high-quality cutting of any material amount & contour complexity

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Production of colored cardboard packaging

Technical information for customers