Double-End Test Probes

A double-end probe has spring-loaded plungers on both ends, providing compliance on the top and bottom contact surfaces simultaneously. A single-end probe has one spring-loaded plunger, and a fixed receptacle or solder tail at the opposite end. Double-end probes enable wireless, receptacle-free fixture designs, while single-end probes anchor into fixture plates for traditional bed-of-nails wiring.

We manufacture double-end probes with plunger diameters as small as Ø0.08 mm at a ±0.01 mm tolerance. The PB020F240B-11A at this diameter fits test point pitches down to 0.30 mm for ultra-fine-pitch wafer-level and advanced packaging test applications.

In a wireless fixture, double-end probes sit in a drilled guide plate without wired connections. The top plunger contacts the DUT test point, and the bottom plunger contacts the corresponding trace or pad on a transfer board or interface PCB below. The dual-spring design absorbs mechanical tolerance on both sides, simplifying fixture assembly and eliminating receptacle wiring.

Current ratings in the double-end range span from 0.2 A for the ultra-fine Ø0.08 mm probe to 4.0 A for the Ø0.65 mm PB101B1580B-43A. For power rail test points requiring higher currents, contact our engineering team to discuss multi-contact or custom high-current configurations.

Cycle life ranges from 50,000 to 100,000+ insertions depending on plunger diameter, plating thickness, and spring force. Most models in the double-end range are rated at 100,000 cycles or above. Match the rated durability to your fixture’s expected lifetime test count before scheduling probe replacement.

Yes, our engineers design custom double-end probes for non-standard pitches, specific overall lengths, custom spring forces, and application-specific plating materials. Send your DUT contact drawing and fixture specification, and our team provides a design recommendation within 1 to 3 business days.

We are certified under ISO 9001, ISO 14001, ISO 45001, and IECQ QC080000. Our production facility maintains greater than 99% mass production yield across 8,000+ custom designs delivered to clients including Huawei, Xiaomi, and Amphenol.

Yes, we provide free samples so you can validate fit, contact resistance, and mechanical compatibility in your fixture before committing to production. Standard catalog configurations ship within two weeks. Custom samples may take additional time depending on design complexity.