Axial Insertion Machine by Southern Machinery: High-Volume Throughput & Scalable THT Automation
When through-hole output needs to scale without scaling headcount, an axial insertion machine that grows with your volume is the difference between adding lines and adding capacity. Southern Machinery's S4000 axial insertion machine is engineered for exactly that: a modular 20-to-100-station feeder architecture that expands in 10-station increments, paired with a 22,000 CPH rated insertion speed (roughly 13,000 CPH real-world) and 0/90/180/270 insertion direction control. It automates the placement of taped axial-lead components - diodes, resistors, capacitors, transistors, and fuses - directly onto PCBs up to 450 x 450 mm, with adjustable clinch angle and length for reliable solder joints before Wave Soldering. For EMS and OEM teams running electrical appliances, power supplies, and vehicle electronics, this is a scalable path from prototype batches to high-volume consumer production on a single, low-energy platform.
Sep 17, 2026 · Updated Sep 17, 2026 · Southern Machinery
Axial Insertion Machine by Southern Machinery: High-Volume Throughput & Scalable THT Automation
Watch in Action: Dual JW & 360 Rotary Table | Boost S4000 Axial Insertion Efficiency
What Is This Machine Used For?
An axial insertion machine automates the placement of taped axial-lead components - diodes, resistors, capacitors, transistors, and fuses - into through-holes on a bare PCB. Instead of an operator hand-inserting each component and bending its leads, the machine cuts, forms, inserts, and clinches leads automatically at high speed.
Southern Machinery's S4000 axial inserter is built for high-volume THT production. It features a modular feeder architecture that expands from 20 to 100 stations in 10-station increments, so a single platform can grow from a modest first line to a full high-mix, high-volume operation. Rated at 22,000 CPH (with roughly 13,000 CPH real-world throughput), it inserts components in four directions - 0, 90, 180, and 270 degrees - and supports an integrated Jumper Wire (JW) Feeder that inserts jumper wires directly without a separate sequencer, saving up to one-third of jumper-wire material.
Q: Why automate axial insertion at all?
A: Axial-lead components remain a large share of THT BOMs in power supplies, home appliances, and vehicle electronics. Manual insertion is slow, prone to polarity and clinch errors, and hard to scale. Automation delivers consistent clinch geometry, verifiable throughput, and predictable labor cost per board.
Typical Application Scenarios
Axial insertion is the backbone of high-volume consumer and industrial electronics. Southern Machinery's S4000 serves the company's core sectors:
- Electrical appliances - air conditioners, televisions, microwaves, electric kettles, and induction cookers, where power resistors and rectifier diodes appear in quantity on control and power boards.
- Power supply - vehicle power supplies, energy-saving power supplies, and electronic ballasts, where diode bridges, zener diodes, and axial capacitors must be placed reliably at volume.
- Vehicle electronics - car audio, vehicle power supplies, and vehicle lighting, where axial-lead parts must meet repeatable clinch and reliability standards before Wave Soldering.
- General electronics - instruments and control boards that blend axial THT parts with SMD placement on the same line.
How It Integrates Into a Complete PCB Assembly Line
An axial insertion machine typically sits in the THT portion of a mixed SMT/THT line, after SMD placement and Reflow Oven soldering but before Wave Soldering:
- SMT side - Solder Paste printing (stencil printer), SMD Pick and Place, and Reflow Oven complete the surface-mount population.
- THT side - the S4000 axial inserter places axial-lead components; a radial insertion machine and/or an odd-form insertion machine handle the remaining through-hole parts.
- Soldering - the fully populated board proceeds to Wave Soldering or selective soldering.
- Inspection & finishing - AOI, cleaning, and depaneling close the loop.
The S4000's Excel-programmable recipes and USB program input make changeovers fast and repeatable, and its low-energy design keeps operating cost predictable as throughput scales.
Key Selection Parameters
When evaluating an axial insertion machine for high-volume THT assembly, confirm these parameters with the vendor:
- Throughput vs. real speed - ask for both the rated CPH and the real-world CPH for your specific component mix and board format.
- Feeder station count and expandability - verify the base station count and whether it can grow (e.g., 20 to 100 stations) to match future volume.
- Component envelope - confirm lead pitch, maximum body length and diameter, and supported component types (diode, resistor, capacitor, transistor, fuse).
- Insertion directions - confirm 0/90/180/270 degree support if your boards require multi-orientation placement.
- Clinch control - verify adjustable clinch angle and length so leads are formed correctly for your board thickness and Wave Soldering process.
- Jumper Wire support - if your boards use jumper wires, confirm direct JW insertion to eliminate a separate sequencer step.
- PCB format - confirm maximum and minimum board dimensions and hole-span range.
- Programming & integration - check for recipe management, USB/program input, and compatibility with your line's board handling.
ROI, Quality & Throughput Considerations
The economic case for the S4000 rests on three pillars:
- Scalable capacity without a second platform. The 20-to-100-station architecture means you can start lean and expand stations as order volume grows, avoiding the capital cost of a second machine.
- Predictable labor cost per board. Rated 22,000 CPH (about 13,000 CPH real) removes the variability of manual insertion and frees operators for higher-value tasks such as Feeder loading, AOI, and changeover.
- Consistent clinch quality. Adjustable clinch angle (0-45 degrees) and length (1.28-1.80 mm) produce uniform lead forming, reducing defects and rework before Wave Soldering - a direct yield and throughput lever.
With dual part detection (catching two components fed in the same chain slot) and low-maintenance feeder heads, downtime stays minimal and first-pass yield stays high.
FAQ
What components can an axial insertion machine place?
Taped axial-lead components - diodes, resistors, capacitors, transistors, and fuses - with a 52 mm tape pitch, 5.0 mm lead pitch, and body up to 16 mm long and 5.0 mm in diameter.
How fast is the S4000 axial inserter?
It is rated at 22,000 CPH, with roughly 13,000 CPH achievable in real-world production depending on component mix and board format.
Can it insert jumper wires?
Yes. An integrated Jumper Wire Feeder inserts jumper wires directly, eliminating a separate sequencer and saving up to one-third of jumper-wire material.
What board sizes does it support?
PCBs from 50 x 50 mm up to 450 x 450 mm, with a hole span of 5-20 mm and jumper-wire span of 5-30 mm.
Is it energy-efficient?
Yes - the S4000 is designed for low cost of ownership and low energy consumption, an important factor at high volume.
Contact Southern Machinery
Ready to scale your THT axial insertion capacity? Southern Machinery - founded in 2011 in Shenzhen, China, with 237+ global customers - delivers full-line SMT and THT PCB assembly automation, backed by global support, spare parts, and operator training.
Contact Jason Wu for a throughput and ROI assessment:
- Email: jasonwu@smthelp.com
- Phone: +86 13602562576
- Website: https://www.smthelp.com
- File Portal: https://file.autoinsertion.com
- Image Library: https://ph.smthelp.com
Two questions worth answering before you buy: What is your current first-pass yield on manually inserted axial components, and how many operator-hours per shift are consumed by hand insertion and lead forming? Share the numbers with our engineers and we will map the payback for your specific product mix.
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