SO-300B Offline Single-Head Selective Soldering Machine by Southern Machinery

A compact offline selective soldering station for PCB rework, prototypes and low-volume, high-mix THT assembly, integrating selective fluxing and soldering on one XYZ platform.

What is this machine used for?

Selective soldering applies solder only at through-hole joints, protecting SMD areas and heat-sensitive parts already placed on mixed-technology boards.

Through-hole soldering on mixed SMT/THT PCBs
PCB rework and repair stations
Prototype and low-volume, high-mix THT production

Verified specifications from product catalog

| Parameter | Specification |

|---|---|

| Max soldering area | 300 x 250 mm (customizable) |

| PCB thickness | 0.2-6 mm |

| Positioning accuracy | +/-0.1 mm |

| Solder pot / nozzles | 15 kg, PID, max 350 deg C; 5 nozzles standard |

| N2 heating / power | Standard, 0-350 deg C; 220 V 50 Hz, 3 kW |

| Dimensions / weight | 1100 x 790 x 1500 mm / ~280 kg |

Specs taken directly from the Southern Machinery product page. Buyers should confirm parameters during quotation.

How the product fits into a complete PCB assembly line

SMD components are placed and reflowed on the SMT line first.
The mixed-technology PCB moves to THT insertion (radial or odd-form inserters).
The SO-300B selectively solders only the through-hole joints; AOI/AVI verifies quality afterwards.

Key selection parameters for buyers

Confirm PCB size, thickness, solder point distribution, nozzle shape, flux and nitrogen conditions before quotation.

ROI perspective

Replacing manual soldering removes a repetitive, quality-critical step. The SO-300B cuts touch labor and rework with consistent +/-0.1 mm positioning. Southern Machinery provides ROI modeling case-by-case - no generic guarantees.

About Southern Machinery - your SMT/THT line partner

Founded 2011 in Shenzhen, China, Southern Machinery serves 237+ global EMS, ODM, automotive and medical electronics manufacturers with cost-effective SMT/THT lines, wave soldering, board handling, inspection and spare parts.

FAQ

What PCB sizes can the SO-300B handle?

Max soldering area 300 x 250 mm (customizable); PCB thickness 0.2-6 mm.

Is the SO-300B inline or offline?

Offline - manual load/unload, ideal for rework and high-mix production.

Does it support nitrogen soldering?

Yes, N2 heating is standard with 0-350 deg C and purity above 99.998%.

Which components can it solder?

Through-hole parts on mixed-technology PCBs, including connectors, relays and electrolytic capacitors.

Next steps

Contact: jasonwu@smthelp.com | WhatsApp: +86 13602562576

Catalog: https://file.autoinsertion.com

Images: https://ph.smthelp.com

Product page: https://www.smthelp.com/so-300b-offline-single-head-selective-soldering-machine.html

Published by Southern Machinery - SMT/THT PCB Assembly Automation Lines. Established 2011 in Shenzhen, China. Serving 237+ global electronics manufacturers.