Contact Probes: Tip Diameter 0.2mm to 2.0mm

Q: What is the difference between a contact probe and a pogo pin?

Contact probes are a type of spring-loaded probe used specifically in test fixtures for automated testing, often with more precise specifications for industrial applications. Pogo pins are a broader category of spring-loaded connectors that can include simpler designs for consumer electronics or charging ports. In industrial contexts, the terms are sometimes used interchangeably, but contact probes typically emphasize higher durability, lower contact resistance, and compliance with testing standards.

Q: How do I select the right contact probe for my test fixture?

Consider the test point size (match tip diameter to pad), required spring force (to avoid damage while ensuring contact), current rating (based on test signals), travel distance (for fixture tolerances), and environmental factors (e.g., temperature). Consult probe manufacturers' datasheets and ensure compatibility with your fixture's probe plate and alignment system.

Q: What maintenance do contact probes require?

Regular cleaning of probe tips with isopropyl alcohol to remove oxidation or debris, periodic inspection for wear or spring fatigue, and replacement after exceeding the rated cycle life. Use proper storage to prevent contamination and follow manufacturer guidelines for recalibration in high-precision applications.

Component Specifications

Definition

Contact probes are spring-loaded, precision-engineered electrical contact components designed for test fixtures in automated testing systems. They establish reliable electrical connections between test equipment and devices under test (DUTs), such as printed circuit boards (PCBs), integrated circuits (ICs), and electronic assemblies. These probes feature gold-plated tips for optimal conductivity, durable spring mechanisms for consistent pressure, and insulating bodies to prevent short circuits. They are critical for functional testing, in-circuit testing (ICT), and flying probe testing in electronics manufacturing.

Working Principle

Contact probes operate by using a spring mechanism to maintain consistent physical and electrical contact with test points on a device. When compressed against a test pad or pin, the spring ensures proper force for reliable electrical connection while accommodating minor variations in surface height. The probe tip conducts electrical signals between the test equipment and the device under test, enabling measurements of voltage, current, resistance, and continuity. The design minimizes contact resistance and prevents damage to delicate components through controlled spring force and precision alignment.

Materials

Tip: Beryllium copper or phosphor bronze with gold plating (typically 30-50 microinches) for high conductivity and corrosion resistance. Spring: Stainless steel (e.g., SUS304) or music wire for durability and consistent spring force. Body: Thermoplastic (e.g., PEEK, PPS) or ceramic for electrical insulation and thermal stability. Plunger: Often gold-plated beryllium copper for smooth movement and electrical continuity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Lifetime	>1,000,000 cycles
Spring Force	10g to 300g
Tip Diameter	0.2mm to 2.0mm
Current Rating	Up to 3A
Travel Distance	0.5mm to 5.0mm
Contact Resistance	<50 milliohms
Operating Temperature	-40°C to +125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 61010, IPC-9592

Parent Products

This component is used in the following industrial products

Test Fixture

A specialized holding device used to secure and position electrical components during testing procedures.

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Engineering Analysis

Risks & Mitigation

Probe wear leading to increased contact resistance
Misalignment causing damage to test points
Contamination from dust or flux affecting signal integrity
Spring fatigue reducing consistent force over time
Thermal expansion mismatches in high-temperature testing

FMEA Triads

Trigger: Accumulation of oxidation or debris on probe tip
Failure: High contact resistance or intermittent electrical connection
Mitigation: Implement regular cleaning schedules using approved solvents; use probes with gold-plated tips for corrosion resistance; design fixtures with protective covers when not in use.

Trigger: Excessive spring force or misalignment during fixture actuation
Failure: Physical damage to test pads or components on the device under test
Mitigation: Calibrate fixture alignment; select probes with appropriate spring force; incorporate force sensors or vision systems for alignment verification; use guided probe plates.

Trigger: Prolonged use beyond rated cycle life
Failure: Spring fatigue leading to inconsistent contact pressure and unreliable test results
Mitigation: Monitor probe usage cycles; establish preventive replacement schedules; use probes with higher lifetime ratings for critical applications; implement automated monitoring of contact resistance trends.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Tip alignment tolerance typically ±0.05mm; spring force tolerance ±10% of rated value; electrical continuity must be maintained within specified resistance limits across all operating conditions.

Test Method

Electrical testing per IEC 61010 for safety; performance validation via resistance measurement with micro-ohmmeter, cycle testing to verify lifetime, and environmental testing (temperature/humidity) per manufacturer specifications. Calibration against certified standards for precision applications.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Contact Probes

Manufacturer profiles associated with Contact Probes.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a contact probe and a pogo pin?

Contact probes are a type of spring-loaded probe used specifically in test fixtures for automated testing, often with more precise specifications for industrial applications. Pogo pins are a broader category of spring-loaded connectors that can include simpler designs for consumer electronics or charging ports. In industrial contexts, the terms are sometimes used interchangeably, but contact probes typically emphasize higher durability, lower contact resistance, and compliance with testing standards.

How do I select the right contact probe for my test fixture?