Precious Metal Spring Contacts

What are "Precious Metal Spring Contacts"?
This is a high-reliability sliding contact composed of multi-wire brush contacts made from bundles of ultra-fine precious metal wires, as well as plate-type brush contacts using precious metal clad materials. It enables accurate signal detection from circuits formed on fine slit patterns and is well suited for automotive sensors and microcircuit inspection applications. Designed to accommodate product miniaturization, it provides stable contact performance and contact compliance while maintaining cost efficiency.

Our precious metal spring contacts are available in fine patterns, which contributes to product miniaturization.
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Multi-wire brush contacts have a multi-point contact structure which consists of fine wires in parallel bunches and provides high contact reliability. Multi-wire brush contacts can reliably read electrical signals from fine patterned circuits, thereby miniaturizing the product size. Scratch brush contacts, in combination with clad materials (see Precious Metal Clad Materials), use high-performance precious metal contact materials only in limited areas. There are various contact materials available with a high cost performance to suit various applications. Various types of brush contacts are available in multiple contact shapes, from cost-effective standard products to advanced customized products.
In addition, scratch brush contact, when combined with precious metal clad materials, allows high-performance precious metal contact materials to be used precisely where needed. It offers a wide range of contact material options tailored to specific applications and high cost performance.
We can offer various options, including different contact shapes, from standard products with excellent cost-effectiveness to highly customized products.

Multi-wire Brush Contact

Features

• Sliding method that provides high contact reliability
• Spring materials for low torque operation
• Use of spring materials gives stable contact force
• Can be made smaller compared to other contact systems

Diameter of wire (mm)	φ 0.05 ~ φ 0.30
Number of wires	3 to 28

Scratch Brush Contact

Features

• Prolongs service life, and reduces size and weight
• Excellent cost performance
• Available as not only spring contacts but also other various types of contacts
• The contact area can be rounded to suit the product application.

Plate thickness (mm)	0.05～0.20
Brush width (mm)	0.2～0.4
Number of contact points	2～4

Various end shapes are available to fit the shape of the printed wiring board. Please contact us for further details.

Applications

Potentiometers, trimmers, encoders, and various in-vehicle sensors (throttle sensors, pedal sensors, height sensors, and sensors for exhaust gas recirculation (EGR) systems), etc.

Precious Metal for Brushes and their Properties

	Composition (wt%)					Density (g/cm3)	Melting point (℃)	Specific resistance (µΩ･cm)	Young's modulus (GPa)	Vickers hardness (HV)	Tensile strength (MPa)
	Pt	Au	Ag	Pd	Others
SP-1	10	10	30	35	Cu,Zn	11.9	1,098	25.5	112	～340	1,250
SP-2	5	70	10	–	Cu,Ni	15.5	955	13.3	106	～340	1,210
SP-3	0.5	–	40	43	Cu	10.8	1,077	28.3	119	～320	1,010
Ag-Pd-Cu	–	–	40	40	Cu	10.7	1,040	12.5	109	～420	1,480
TK-1	–	–	29.5	40	Cu, etc.	10.5	1,050	10.5	110	～495	1,740

For other materials, please contact us for further details.

*The property values are provided for reference purposes only and the adjustable range may vary depending on the shape. Therefore, please confirm