ProductsDouble-Ended Probes
The Structure of Double-Ended Probes
Unlike conventional single-ended probes, double-ended contact probes feature plungers on both ends, offering greater flexibility in compact testing environments. Each probe consists of four key components:
Two Plungers: These make contact with the test target and the test fixture from
either side, delivering consistent and balanced pressure.
Pipe: Encases the spring and guides the plungers, ensuring overall
structural stability.
Spring: Maintains the correct contact force at both ends, enabling stable
and reliable electrical connections.
Differing from single-ended probes that require a socket (receptacle), double-ended probes are fixed
directly into a board (holder), allowing them to support narrow pitches below 0.45mm—a task difficult for
traditional probe systems.
One end of the probe can connect to a relay board electrode, or even directly to a metal terminal with
enameled or lead wire, offering multiple wiring options to suit your design needs.
Types of Double-Ended Probes
We offer two main configurations based on your testing setup:
From long and thick probes (20mm length, φ1.0mm) to ultra-compact and fine (as small as 1.5mm in length and φ0.1mm in diameter), we offer an extensive selection.
Tip shapes can also be selected to match your test
conditions, although smaller diameters may limit tip shape options.
Single-Action Type
One plunger is fixed (clipped), while the other moves. Ideal for shorter probes.
Dual-Action Type
Both plungers move and compress under load.
Wiring Types Comparison
Double-ended probes are typically installed between two resin boards, creating a probe head assembly. Both dual-action and single-action configurations are available depending on your setup. For wiring, we support two main methods:
| Relay Board Type | Lead Wire Type | |
|---|---|---|
| Initial Cost |
× |
✓ |
| Repeat order |
✓✓ |
? |
| Electrical Characteristics |
✓✓ |
? |
| Other Characteristics |
Shorter setup time; ideal for large-scale testing; |
Better for low-pin count or evaluation tests |
Need help choosing the right wiring method? We can provide suggestions tailored to your test requirements.
For example, start with a lead wire prototype for evaluation, then switch to a relay board for mass production.
- Initial setup costs for relay boards include PCB design, gerber format file creation, and stencil manufacturing. We offer full in-house support from design to fabrication and assembly.
How to Make the Most of Your Double-Ended Probes
Normally, contact probes are inserted into probe holders.
Only the worn-out probes need replacement, making
maintenance easier and more cost-effective.
Build Your Ideal Double-Ended Probe
Due to the highly customized nature of double-ended probes, we offer a limited standard lineup. However, we can
design solutions based on similar models or design entirely new ones to meet your specific needs.
Let us know your desired specifications—pitch, overall length, contact force, tip shape, and more—and we’ll
provide a tailored solution.
Fixture Manufacturing
At Seiken, we go beyond just providing probes. We offer one-stop service, including material processing and machining, fixture assembly, and wiring.
Need only the holder? We can help you too. Feel free to contact us—we’re here to support you from design to manufacture.