At Seiken, we specialize in delivering high-precision test fixtures
that power the world’s most demanding electronic-testing environments.
From contact probes to probe cards, IC sockets and full fixture solutions,
we offer everything you need—custom-engineered, expertly manufactured,
and ready to perform.
Drawing on a broad spectrum of materials,
tip geometries, pitches, and advanced features—including high-current capability,
non-magnetic designs, Kelvin sensing, ultra-fine pitches, and more—
we tailor every solution to your unique specifications and timeline.
Probe ManufacturerWhy Customers Choose
Seiken
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Domestic
ManufacturingReliabilityDesign, machining, assembly and inspection—all under one roof in Nagano City. This fully in-house process guarantees that we deliver optimal solutions to ensure the success of your most important projects.
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Technical
ExpertiseKnow-howSince 1984, our relentless pursuit of innovation has driven material and application breakthroughs across the industry. From different metal alloys to cutting-edge polymers, we engineer with purpose and precision.
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Innovative
ProposalsIngenuityWith our innovative engineering, we go beyond meeting your requirements—and even anticipate them. Our team blends your input with insights from decades of field experience to craft forward-thinking, value-driven solutions.
Our Core Products
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Contact Probes
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Advanced
Probe Cards
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IC Sockets
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Test Fixtures
Contact Probes
Single- and double-ended probes engineered to boost accuracy in semiconductor and electronic-component testing. Options include high-current, non-magnetic materials, and more—fully customizable.
Explore Our ProductsAdvanced Probe Cards
Unlock freedom in pin layout and benefit from easy maintenance for efficient front-end wafer testing —ideal for high-mix, low-volume production environments.
Explore Our ProductsIC Sockets
Socket solutions optimized for performance inspection at the package level. We tailor each design to match your test setup, enhancing your process.
Explore Our ProductsTest Fixtures
From sketch to assembly, we deliver turnkey test fixtures built for today’s fast-evolving electronics landscape. Your vision becomes our mission.
Explore Our ProductsApplications Across Industries
Seiken’s solutions support a wide range of applications—from semiconductors and PCBs to electronic components, automotive systems and medical equipment. We also welcome early-stage development and R&D projects.
Other Services
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Precision Machining of Metals & Resins
Looking for parts with micron-level precision? Our small-lot, high-precision machining services handle metals (BeCu, SK alloys, brass), resins and ceramics—with fast turnaround and the accuracy you need for specialized terminals and test components.
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PCB Design & Assembly Services
Through our group companies, we offer end-to-end electronic assembly services—from PCB design and power-supply engineering to component mounting. Whether you need high-precision surface-mount or through-hole insertion, expert hand soldering, or custom board modifications, we deliver integration and quality you can trust.
What is a contact probe?
Case Studies
on Testing Solutions
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Non-MagneticNon-Magnetic Probe Card for Magnetic Sensor Devices
- Semiconductor Manufacturers
- Front-End Semiconductor Processes
- Back-End Semiconductor Processes
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OthersContact Probes for High-Temperature Environments
- Semiconductor Manufacturers
- Back-End Semiconductor Processes
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OthersHand-Press Fixture for Flexible Sample Inspection
- Electronic Component Manufacturers
- Universities & Research Institutes
- Others
About Seiken
FAQ
What is a contact probe?
A contact probe is a component normally used to test the electrical conductivity of electronic devices such as semiconductors, circuit boards, and more. It typically consists of three parts: a plunger (tip), a barrel (housing), and a spring (to control contact pressure). When properly matched to the application, it ensures stable, accurate signal transmission during testing.
How do I select the right probe for my application?
Choosing the ideal probe depends on n several factors, inlcuding your device under test—whether it’s a semiconductor, PCB, or IC—as well as factors such as terminal size and pitch, durability requirements, heat resistance, and spring force. Our team is available to help you identify the best probe for your specific conditions and testing environment.
Can custom-designed probes be mass-produced?
Absolutely. Once the prototype is evaluated and approved, we can move into full-scale production. Reach out to us to discuss your specific requirements.
Our Group Companies
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PCB Design & Assembly
With expertise in PCB design, power supply, and high-frequency, we provide end-to-end support from prototyping to mass production, offering flexible and tailored solutions.
Shinano Seiken Inc.
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Test Sockets for
Electronic ComponentsHigh-precision test sockets for crystal devices, MEMS sensors, ICs, and more—engineered for accuracy, reliability, and performance.
MiS Technologies Corp.
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Functional Test Fixtures & Machined Engineering Plastics
Custom-built test fixtures and precision-machined engineering plastics that support inspection processes and boost testing efficiency.
IMI Co., Ltd.