Through-Hole Assembly Services
Our team specializes in high-mix, low-volume work—but we’re equally equipped to handle high-run builds with speed and precision. From complex component layouts to rugged, field-ready assemblies, we provide the flexibility and quality your project demands. Whether you’re building for aerospace, robotics, medical, or industrial applications, Hi-Tek delivers results you can trust.
What Is Through-Hole Assembly?
Through-hole assembly is a time-tested method for mounting electronic components onto printed circuit boards by inserting component leads into drilled holes and soldering them to the board’s opposite side. It’s known for creating a strong solder joint, which makes it ideal for applications exposed to mechanical stress, heat, or vibration.
Unlike surface mount technology (SMT), where surface mount components are placed directly onto board pads, through-hole provides a physical anchor via the plated through holes.
This makes it a preferred choice for radial lead, axial lead, and bulkier component packages that require additional support.
While SMT is favored for high-density and compact designs, through-hole is still essential for components that must remain secure in rugged environments—or where parts may need to be replaced or adjusted in the field.
Hybrid Builds: Surface Mount + Through-Hole
Today’s PCB design often calls for a mix of SMT components and through-hole parts. At Hi-Tek Electronics, we specialize in mixed board builds that bring the best of both worlds together.
Our engineers combine surface mount technology (SMT) and through-hole assembly to meet the layout, function, and mechanical needs of each project. SMT is perfect for conserving real estate and achieving tight, high-density layouts, while through-hole ensures stability for high-stress or mission-critical components.
Whether your board uses fine-pitch SMT devices, large transformers, or a combination of both, we handle each component placement with care, precision, and attention to detail—ensuring your final product performs reliably in its intended environment.
Our Through-Hole Assembly Process
At Hi-Tek, we’ve refined our assembly process to balance speed, precision, and flexibility—so you can stay ahead of your production schedule without compromising quality.
Here’s how we do it:
Design Review & Planning
Our team reviews your PCB design for manufacturability and compatibility with both through-hole and SMT standards. We’ll also help optimize placement and routing if needed.
Component Placement
We handle all standard component types including radial lead, axial lead, and specialty devices. Insertion may be manual or semi-automated depending on your build.
Selective Soldering & Wave Soldering
For consistent solder joints, we offer both traditional wave soldering and selective soldering—perfect for mixed-technology boards where heat-sensitive SMT devices are also present.
Automated Optical Inspection (AOI)
Once soldered, each board goes through automated optical inspection to verify placement, alignment, and solder quality.
Reflow Oven (for SMT components)
In hybrid assemblies, SMT components are placed and reflowed in our high-precision reflow oven prior to through-hole processing. This ensures peak solder performance without thermal damage.
From one-offs to production runs, our process scales with you—delivering repeatable, high-quality results every step of the way.
Why Choose Through-Hole?
Though many electronics manufacturers lean heavily on SMT today, through-hole technology still plays a critical role—especially in industries where dependability isn’t optional.
Benefits include:
- Mechanical Strength: Ideal for components that face vibration, torque, or physical wear
- Thermal Stability: Through-hole parts often perform better under sustained heat or power load
- Field Serviceability: Easier to replace or repair compared to tightly packed SMT parts
- Legacy Compatibility: Many older or specialty parts are still only available in through-hole formats
We support through-hole assembly for clients across a wide range of industries—each with unique reliability requirements and form factor constraints.
FAQs About Through-Hole Assembly
What’s the difference between through-hole and surface mount assembly?
Through-hole assembly uses wires or “leads” on components that go through tiny drilled holes in the board and are soldered on the other side. Surface mount components are placed directly onto the board’s surface and soldered there. Through-hole is better when you need strong, stable connections—especially for parts that get bumped or carry more power.
When should I choose through-hole instead of surface mount?
If your product needs to handle rough conditions—like shaking, heat, or heavy use—through-hole is a better choice. It’s also great for bigger parts, or if you want to be able to swap them out later. Surface mount is usually used for smaller parts in tighter spaces.
Can I use both surface mount and through-hole parts on the same board?
Yes! Most modern circuit boards use a mix of both. We’re experts at building boards that combine the space-saving power of surface mount technology (SMT) with the strength and durability of through-hole components.
What kinds of components are usually through-hole?
Larger parts like connectors, switches, capacitors, and transformers are often through-hole. These have axial or radial leads that go through the board for extra hold. Some parts just aren’t available in surface mount formats.
Need reliable through-hole assembly for your next product? Whether you’re dealing with complex builds or rugged industrial applications, Hi-Tek Electronics is ready to deliver. We’ll guide you through the process, help you optimize your design, and produce the high-quality boards your project deserves.
Reach out today to request a quote or talk to our team—we’d love to learn about your goals and show you what Hi-Tek can do.
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