THT Assembly
We provide professional THT assembly services with leaded and lead-free soldering options
Through Hole PCB Assembly Services Offered by STHL
Through-hole assembly is commonly used in applications where longevity, dependability, and long-term operation are necessary, which ensure a stronger mechanical connection. This process is especially well-suited for heavy components, high-power equipment, and applications in which mechanical stress or harsh conditions are at issue. We assemble a wide range of THT components, including connectors (USB, terminal blocks, headers), large capacitors, inductors, relays, transformers, switches, and many electromechanical parts.
• Single-sided Through-Hole PCB Assembly
• Double-sided Through-Hole PCB Assembly
• PTH & SMT Mixed PCB Assembly
• Low to high volume THT assembly
• Full-automatic PCBA Cleaning Process
• Conformal Coating & Potting Service
Why Choose STHL as Your THT PCB Assembly Supplier?
Through-hole assembly remains the preferred solution for durable and high-power electronic products. Our services are used in many industries including power supplies, computer motherboards, security systems, industrial cleaning equipment, medical devices and LED lighting, among others. At STHL, our skilled technicians deliver fast, precise, and reliable THT assembly services tailored to customer needs.
Our lead-free wave soldering process fully complies with RoHS standards, ensuring environmental safety and long-term performance. With two dedicated THT assembly lines and two post-soldering lines, STHL efficiently handles both prototypes and high-volume manufacturing or quick turn runs, maintaining exceptional consistency and quality across every project.
NO MOQ
1pcs OK, NO QTY limitness
Reasonable cost, no extra overcharge
Variety of Services
Support full turnkey PCB assembly
Suport patrial turnkey PCB assembly services
Quality Assurances
ISO 90001 / ISO 140001 / IATF16949
ISO 13485 / RoHS / REACH / UL certificated
Prompt Delivery
Two shifts in production department
Quick-turn prototypes within a week
Through-Hole PCB Assembly Capabilities of STHL
Types of THT PCB Assembly
Types of THT PCB Assembly
Single-Sided THT Assembly
Double-Sided THT Assembly
Mixed Assembly (SMT+PTH)
Post Soldering Assembly
Mechanical Assembly Services
Reliable Testing Services
Reliable Testing Services
100% AOI & X-ray Inspection
FAI Testing (First Article Inspection)
ICT Testing / Burn-in Testing
Functional PCB Testing
3D Microscope PCB Inspection
More Value-added Services
More Value-added Services
All kinds of Footprint IC Programming
Laser Engraving Barcode & Labels
Full & Selected Conformal Coating
PCB Potting and Encapsulation
Customize PCBA Testing Fixture
2x THT Assembly Lines, 2x Post Soldering Lines, 2x Functional Test Lines;
2x Full-automatic Cleaning Machine, 1x PCBA Depaneling Machine
THT PCB Assembly
Wave Soldering
Post Soldering
Automatic Cleaning
Depanel Machine
ICT Test
Test Line
Functional Test
Through-Hole PCB Assembly FAQs
What components can you do THT assembly?
+We assemble a wide range of THT components, including connectors (USB, terminal blocks, headers), large capacitors and resistors, inductors, relays, transformers, switch buttons, and many electromechanical parts. All components are inserted through PCB holes according to design requirements.
Can you handle mixed-technology assembly (both THT and SMT)?
+Absolutely. We specialize in mixed-technology assembly. After SMT components are placed and reflowed, THT insertion and soldering (wave soldering or manual soldering) are completed in-house, ensuring seamless integration and stable quality for complex hybrid PCBs.
What is your Minimum Order Quantity (MOQ)?
+There is no MOQ limitation. We support customers from single-piece prototypes to high-volume production runs.
Do you accept some critical components supplied by customers themselves?
+Yes. We support Customer-Provided Parts (CPP) as well as full turnkey service. We handle component inspection, kitting, and traceability to ensure assembly quality.
Can you assemble small-size or special-shaped PCBs?
+Yes. We assemble PCBs of various sizes and shapes using dedicated THT fixtures or panelization with tooling edges.
Do you offer special assembly such as adding PCB White/Yellow glue?
+Yes, we can add kinds of glue to your PCB boards as per requirements for mechanical stability, thermal management, protection from vibration and electrical insulation requirements.
How do you ensure the quality of THT solder joints?
+Quality is ensured through wave soldering fixtures, skilled manual soldering, post-soldering inspection, 3D microscope inspection, and IPC-A-610 compliance.
How do you clean PCBA boards after soldering?
+We use automatic cleaning machines to remove flux residues, ensuring clean and reliable PCBA assemblies.
How do you depanel boards after THT assembly?
+Depaneling is performed using full-automatic or semi-automatic depanel machines to ensure board integrity and smooth PCB edges.
What factors are included in through-hole PCB assembly cost estimation?
+Cost factors include component quantity, design complexity, material types, and any required custom fixtures or tooling.
What files are required for THT assembly?
+We require Gerber files, BOM (with MPNs, quantities, and reference designators), and CPL / Pick & Place files. Additional assembly drawings are welcome.
Superior service oriented, top quality priority pursue refinement and excellence, achieve win-win cooperation.
Whenever Need an Electronic Assembly Partner You Can Count On Us
First Pass Yield (FPY)
>98%
Pass Rate of Delivery
>99%
Customer Satisfaction
>98%
On-time Delivery Rate
>98%
Customer Complaint Rate
<2%