Resources
Technical guides and news on spring contacts, canted coil connectors and precision manufacturing.
Technical articles
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How canted coil springs work and how they are tested
A canted coil spring is a welded ring of inclined, elliptical coils that deforms as a unit to deliver consistent load at every contact point. Its stable contact force and wide operating range suit high-voltage connectors and switches.
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The clamping function of high-temperature springs
High-temperature springs are used wherever a part must be held in firm contact at elevated temperature. If the clamping force is lost, contact resistance rises and heat builds up until the contact metal can melt.
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Spring engineering: recent research and findings
A digest of spring-related engineering research covering air-spring development for intercity trains, spring-oscillator dynamics, Archimedes spiral spring stiffness, spring contact fingers in draw-out circuit breakers and nitriding of spring steel.
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Spring contact fingers: principle and benefits
A spring contact finger is an elastic contact installed between two rigid input and output contacts; compression generates the elastic force that ensures reliable contact. Each coil acts as a parallel contact point, giving low resistance, even current distribution and low wear.
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Canted coil springs as gas-nozzle connector stabilizers
A canted coil spring holds an almost constant force over a wide deflection range, so it can stabilize and seal a connector even under high gas pressure. This article explains why the spring suits connecting parts and how radial and axial springs differ.
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Why board-to-board connector testing matters
Board-to-board connectors mate a male and a female socket, and repeated mating and unmating subjects both halves to mutual stress that can wear the parts out. Correct plating and a proper test procedure keep contact resistance low and extend service life.
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Board-to-board connector faults and troubleshooting
Correct connection of board-to-board connectors extends product service life and keeps mechanical equipment running reliably. A board-to-board product failure left unaddressed can cause significant economic loss.
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Composition and use of canted coil springs
A canted coil spring is a mechanical part that works by elasticity and is usually made of spring steel. It controls the movement of mechanical parts, reduces shock and oscillation, stores energy and measures force, and is widely used in machines and instruments.
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Spring strap contacts in high-voltage equipment
In power transmission and distribution, an electrical connection must be safe and stable, with low heat generation, low contact resistance and a stable, uniform contact force. Spring strap contacts provide these properties and are widely used in switchgear, circuit breakers, transformers and gas-insulated busbars.
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Canted coil springs in mechanical seals
In a mechanical seal, a canted coil spring acts as the elastic compensation element, pressing the seal faces together with an even force while absorbing wear, vibration and pressure changes. Radial and axial springs suit connecting parts and seals respectively.
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Wire spring jacks vs ordinary jacks in connectors
The hyperboloid wire spring jack contacts the pin through multiple independent spring wires, giving low insertion force, low and stable contact resistance and long mating life. Ordinary jacks are simpler, with plated contacts from 0.5 mm to 20 mm diameter.
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Key factors that affect finger spring fatigue strength
The fatigue strength of a finger spring depends on the yield strength and surface condition of the wire, part size and metallurgical quality. Each of these factors determines how many cycles a spring survives before fatigue fracture.
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Canted coil spring contacts: how they work and how they are made
A canted coil spring contact is an annular ring of skewed, elliptical wire coils that keeps a nearly constant contact force over a wide deflection range. Its multi-point contact design, low cost and choice of copper alloys make it a standard choice for high-voltage switchgear.
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Common problems with industrial plugs and their fixes
Most faults with industrial plugs and sockets come from installation and operating errors rather than from the hardware itself. Reading the manual, installing to specification and choosing the correct ingress protection rating prevent nearly all of them.
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Wire spring jacks vs standard jacks in aviation plugs
Wire spring jacks use multiple independent spring wires arranged in a hyperboloid to create parallel current paths, giving small, stable contact resistance and high reliability. Standard jacks are simpler, with gold-, silver-, tin- or nickel-plated contacts from 0.5 mm to 20 mm diameter.
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Board-to-board connector precautions and common oversights
Before using a board-to-board connector, check that the connection is not poor and that the connector is fully locked, to prevent simple failures during use. Handling and operating the connector correctly extends its service life.
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How to clean and brighten spring finger contacts
Finishing a spring finger involves degreasing to remove oil and scale, then polishing with a brightener to give a nickel-like, non-fading finish. Three degreasing methods are described here: immersion, mechanical finishing and ultrasonic cleaning.
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Wave springs and disc springs: applications and manufacture
A wave spring is an annular elastic element with crests and troughs that saves at least half the axial space of an ordinary coil spring at a similar load. This guide also covers disc spring (belleville) classes, manufacture, surface treatments and applications.
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Selecting and maintaining board-to-board connectors
Because the internal pin contacts of a board-to-board connector are electroplated, the connector must be kept sealed in storage to prevent moisture from oxidizing the contacts. This article covers the key points to check when selecting a connector and how to maintain it in service.
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The role of springs in modern industry
Springs store mechanical energy by deforming under load and return to their original shape when unloaded, releasing the stored energy back into motion. They cushion shock, control movement, store and release energy, and measure force.
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The role of pin jack connectors in future industries
Pin jack electrical connectors connect or disconnect circuits and transmit electrical signals across aviation, aerospace, energy, communications and transport applications. Demand is growing sharply in new energy vehicles, where each vehicle is expected to use 600 to 1,000 connectors.
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How torsion springs are made on CNC spring machines
Torsion springs are high-precision components whose production can exceed what general-purpose spring machines can deliver. Dongguan spring factories use fully automatic universal CNC spring-forming machines that complete the forming and positioning of different shapes and angles in a single process.
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Canted coil springs: what they are and how they work
A canted coil spring, also known as an inclined coil spring or spring finger contact, carries high current in a small space and can serve as a simple mechanical connection. Its multiple independent coils provide consistent contact, wide tolerance compensation and a long service life.
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Spring finger contacts: how they work and what they do
A spring finger is an annular canted coil contact that carries high current in a small space and can also serve as a purely mechanical connection. Its multi-point design delivers consistent contact pressure, low contact resistance and a long service life across medium- and high-voltage applications.
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How automotive tailgate springs are manufactured
Automotive tailgate springs are extension springs that lift the trunk lid from its latch and hold it open. This article describes the coiling and heat-treatment steps used to make them, and the general functions and classification of springs.
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Why spring fingers are well suited to high-current switching
Spring finger contacts are a compact, low-cost interconnection method for high-voltage switching equipment. Their multi-point, distributed contact design delivers high current capacity, consistent contact pressure and good wear resistance.
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Classification and function of common springs
A spring is an elastic element that deforms by using the elasticity and properties of its material. Springs are used for shock absorption, clamping, energy storage and force measurement across a wide range of products.
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What is a spring finger contact?
A spring finger is an annular spring contact that carries high current in a small space and can also serve as a purely mechanical connection. Its inclined, elliptical coil design maintains a near-constant contact force over a wide compression range.
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Company news, industry news and technical knowledge
The SISE news section is organized into three parts: company news, industry news and technical knowledge. Browse each section for company updates, market developments and engineering articles on spring contacts and connectors.
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Coil springs for motor carbon brush devices
More motor manufacturers are fitting coil springs in carbon brush assemblies because they increase brush life, reduce noise and allow a more compact design. The springs cost a little more than conventional compression springs, but the performance gain is worth it.
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European cable company visits SISE
In December 2018 a large European cable company, DEKA, visited SISE to inspect the IEC 62196 series charging connectors and the company's manufacturing facilities. The two sides discussed cooperation for 2019 and the use of SISE spring contact jacks in high-end export markets.
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Canted coil spring contacts: ten years of manufacturing
Canted coil spring contacts are wound as circular wire springs with elliptical, inclined coils, so every coil deforms independently and the load stays consistent at each contact point. Dongguan Spring-in-Spring Electronics has manufactured them since 2011, including a bidirectional coil spring finger with up to 300 contact points.
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Material selection for GIS spring fingers
GIS spring fingers are made from chromium zirconium copper (C18150), beryllium cobalt copper (C17500) or beryllium copper (C17200). Temperature-rise tests show the high-conductivity chromium zirconium copper running 4-10 °C cooler than beryllium cobalt copper.
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Industrial connectors in new energy vehicles
New energy vehicles still face drawbacks such as limited range, safety concerns and inconvenient charging, but they have become a new industrial growth point. This trend is a major opportunity for the industrial connector industry.
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How a wire spring jack works
A wire spring jack is a high-stability, high-reliability contact structure for high-current terminal blocks and connectors. Its inclined wires form a hyperboloid that grips the inserted pin under uniform tension.
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Material requirements for canted coil springs
Canted coil spring material must combine high yield strength, good plasticity and toughness, excellent surface quality, tight dimensional control and consistent properties. Each requirement supports a specific aspect of spring performance and service life.
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Where are speciality springs used?
Speciality springs are spring-steel parts that control movement, absorb shock and store energy. Their small size, high load capacity and stackability make them a compact alternative to cylindrical coil springs across defense, industrial and construction equipment.
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How to clean stainless steel springs
Stainless steel springs pick up oil and dust in service and need careful cleaning to avoid surface scratches. Use a soft cloth, or alcohol or bleach with a water rinse for stubborn contaminants, and never use steel-wool pads or abrasive tools.
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Springs: types, materials and common uses
Springs are used in engines, clutches and everyday products such as ballpoint pens, clocks and toys. They are classified by the load they carry and by their shape, and carbon spring steel wire is the most common spring material.
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Types and functions of contact springs
A spring is an elastic element that deforms by using the elasticity of its material. Springs appear in applications from ballpoint pens and elevator buffers to precision machinery, where they cushion shock, control movement, store energy and measure force.
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Electrical contacts: classification and role in switchgear
Electrical contacts are the working parts of high-voltage circuit breakers, switchgear, disconnectors and grounding switches. They are classified as rivet, sheet or powder metallurgy contacts depending on the application.
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Spring-loaded test probes: definition and classification
A test probe is the contact medium used for electrical testing of precision electronic components. Probes are classified by testing application, and each family is defined by its diameter, bandwidth and current rating.
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Spring-loaded probes: testing and contact applications
Spring-loaded probes make contact with the test points of printed circuit boards, components and wiring. They are also used to test cable systems and can act as charging contacts.
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Composition of a spring-loaded probe
A spring-loaded probe consists of a copper tube, a spring and a pin shaft. The tip style and spring pressure can be matched to the application, and mounting in a socket allows quick removal for repair or replacement.
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Common spring-loaded probe applications
Spring-loaded test probes cover a wide range of test-fixture needs: ICT/FCT fixture probes, short-travel battery contact probes, pneumatic and threaded probes, high-current and switching probes, and push-back probes for connector seal verification.
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Materials for spring-loaded probe needles
Spring-loaded probe needles are made from tungsten, rhenium-tungsten alloy, copper or the A+ alloy. The choice of material determines elasticity, resistance to deflection, and how often the needle needs cleaning.
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Bow spring finger (canted coil) applications
Bow spring fingers, or canted coil springs, carry high current in a small space and can also serve as purely mechanical connections. Each coil compensates independently for contact and surface variation, giving wide tolerances, low operating temperature and long service life across many industries.
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The advantages of spring finger contacts
Spring finger contacts are compact and inexpensive, provide multi-point near-lossless contact for high current, and wear evenly because each contact point carries a modest load. Their wide working range and tolerance of surface and assembly error suit them to large-scale production.
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Accuracy and performance of spring fingers
Spring finger contacts provide a simple, compact and low-cost interconnection with strong current-carrying capacity. Multi-point contact, consistent per-point pressure and a wide working range make them suitable for high-voltage switchgear, rail, energy and testing equipment.
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Where are spring fingers used?
Spring fingers are used in high-, medium- and low-voltage power equipment, high-speed rail, oil exploration and testing, and new energy vehicles. SISE's bidirectional and single-turn spring fingers form more than 300 contact points, last more than 100,000 mating cycles and insert with about 10 N of force.
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Finger spring surface treatment methods
Cleaning and finishing a finger spring removes oil and oxide scale and improves surface quality. The process has two stages: cleaning, which can be done by immersion, vibratory polishing or ultrasonics, followed by a glazing step that leaves a bright, fade-resistant finish.
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Spring finger contacts: features and applications
Spring finger contacts combine a simple structure, multi-point contact and low heat build-up with automatic arc extinction and stable performance under shock and vibration. SISE spring fingers operate from -25 °C to 105 °C with a hardness of HV ≥ 370.
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What is a wire spring jack?
A wire spring jack is a pin socket assembly whose inner wall carries multiple beryllium copper wires wound at an angle, forming a hyperboloid cavity that grips an inserted pin across many contact points. The result is low contact resistance, low heat generation, a soft insertion feel and a long cycle life.
News
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