What is Silver Point Contact?
Silver Point Contacts use a formed silver working point to establish the electrical interface, with cold heading used to produce the contact geometry and mechanical body. The structure is suited to relay contacts, limit-switch contacts, smart-meter relay assemblies, automotive electrical controls, and industrial control equipment where contact resistance, dimensional consistency, and repeated mechanical operation must be controlled.
Technical Specifications of Electrical Contact Rivet
| Technical Parameter | Engineering Specification / Value |
|---|---|
| Electrical Conductivity | ≥ 82% IACS (AgSnO2 alloy tip), Substrate ≥ 97% IACS |
| Shear Strength / Bonding Force | ≥ 220 MPa (Cold‑headed metallurgical interface) |
| Hardness (HV/HB) | Tip: 95‑130 HV; Copper Shank: 90‑110 HV |
| Contact Resistance | < 0.8 mΩ at initial operational state |
Core Performance Features of Silver Alloy Point
Oxide‑film breaking capability:
Concentrated point‑face contact pressure pierces the surface tarnish layer, avoiding intermittent contact failure under normal atmospheric conditions.
Metallurgical bimetal bonding:
Silver Alloy Point and copper substrate achieve solid‑phase combination, with no risk of point‑layer peeling off.
Optimized for micro‑switch & button assembly:
Compact point‑face geometry of Silver Electrical Contacts fits narrow inner space of miniature switch components.
Tunable point‑size:
With the Cold Forming Process Contacts, adjust point‑face diameter to balance contact‑pressure and heat‑dissipation requirements for target load.
Manufacturing Notes For Cold Headed Parts
Multi‑Station Cold Heading Precision
Wire stock is fed through multi‑die cold heading machinery to plastically deform Silver Alloy Tips and copper shanks into unified rivets without thermal degradation.
01
Solid‑State Interfacial Bonding
High‑tonnage mechanical impact forces metal lattice structures into close contact, creating a high‑strength solid‑state bond line exceeding base material shear limits.
02
Automated Optical Dimension Sorting
High‑speed laser inspection systems screen every production lot to verify spherical crown radii, shank straightness, and total Contact Point height to tight micron tolerances.
03
Controlled Grain Structure Alignment
Cold deformation for Cold Headed Parts elongates internal grain structures along the primary load axis, maximizing tensile strength and structural rigidity against high‑impact closing forces.
04
Application Boundary of Electrical Contact: Suitable & Unsuitable End‑Devices
Recommended Low‑Voltage Switching Equipment
Bimetal Silver Electrical Contacts for Switches are deployed in auxiliary relay switching circuits, micro‑limit switches, smart meter latching relays, and thermostat control units requiring high reliability.
Unsuitable High‑Current Circuit Breakers
Not engineered for heavy industrial molded case circuit breakers (MCCB) or high‑voltage electric vehicle (800 V HVDC) contactors requiring large distributed contact areas.
Frequency and Actuation Constraints
Optimized for high‑frequency, low‑to‑medium current switching environments, these Cold Headed Parts use concentrated physical force that effectively pierces surface contaminants.
Environmental Sealing Prerequisites
For these Electrical Contact, best utilized within enclosed relay housings or protected enclosures to prevent atmospheric sulfur exposure from corroding unprotected shank interfaces.
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