SO-300 High-Speed Offline Selective Soldering Machine
Offline selective soldering for 300x300 mm boards: servo accuracy of ±0.1 mm, jet fluxing, IR preheat, and PC recipe control for flexible THT production.
Aug 16, 2026 · Updated Aug 16, 2026 · Southern Machinery
SO-300 High-Speed Offline Selective Soldering Machine
High-mix THT boards with tight thermal margins need selective soldering, not a full wave line. The SO-300 combines fluxing, preheating, and soldering in a single station.
What is this machine used for?
A compact single-head selective wave soldering system for PCB rework, offline stations, and flexible THT assembly.
- Selective jet-valve fluxing with a 1 L flux tank
- Bottom IR preheating: 3 kW, 25–240 °C
- PID-controlled 15 kg solder pot, max 350 °C
- Ideal for power supplies, appliances, automotive, and line-side use in EMS
Verified specifications
| Parameter | Value |
|---|---|
| Model | SO-300, offline single head |
| Soldering area | 300 x 300 mm, customizable |
| PCB thickness | 0.2–6 mm, edge >3 mm |
| Positioning accuracy | ±0.1 mm, servo XYZ |
| Fluxing / preheat | Jet valve 1 L / IR 3 kW, 25–240 °C |
| Solder pot / nozzles | 15 kg, 350 °C PID / 5 pcs, ID 4×3 + 5 + 6 mm |
| N2 | 1–2 m³/h per nozzle, >99.998% |
| Power / weight | 220 V, 50 Hz, 5 kW / ~380 kg |
Buyers should confirm parameters during quotation. Values sourced from the Southern Machinery product page.
How it fits into a complete PCB assembly line
- SMT line prints, places, and reflows the SMD side
- Insertion machines place THT parts
- SO-300 solders THT offline with programmed paths
- Cleaning and inspection complete the flow
Key selection parameters for buyers
- PCB size versus the 300 x 300 mm maximum soldering area
- Soldering paths per board revision
- N2, exhaust 500–800 m³/h, air 3–5 bar
ROI perspective
One SO-300 replaces manual selective stations and improves solder-joint repeatability. PC recipes cut changeover time. Southern Machinery provides ROI modeling case-by-case.
About Southern Machinery
Founded in 2011 in Shenzhen, Southern Machinery supplies SMT/THT lines, insertion machines, wave soldering, board handling, and inspection to 237+ global customers, offering cost-effective automation and global support.
FAQ
Is the SO-300 inline or offline?
Offline: boards are loaded and unloaded manually beside the line.
What PCB sizes does it handle?
Up to 300 x 300 mm, board thickness 0.2–6 mm.
What nozzles are included?
5 pcs: ID 4 mm ×3, 5 mm, and 6 mm.
Does it need nitrogen?
N2 is supported (1–2 m³/h per nozzle) to improve wetting and reduce dross.
Can recipes be saved?
Yes. Windows PC software stores paths, dwell time, Z height, and temperatures.
Is it CE compliant?
Southern Machinery equipment is CE certified and RoHS compliant.
Next steps
Contact: jasonwu@smthelp.com | WhatsApp: +86 13602562576
Catalog: https://file.autoinsertion.com
Images: https://ph.smthelp.com
Video: https://www.youtube.com/watch?v=uTcSNQ7qK-A
Published by Southern Machinery – SMT/THT PCB Assembly Automation Lines. Established 2011 in Shenzhen, China.
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