Description
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Direct-Solderable Winding Wire
Direct-Solderable Magnet Wire
Professional-grade solderable enameled copper wire that tins directly without stripping — engineered for efficient termination, reliable dielectric strength, and high-speed coil winding in relays, solenoids, transformers, and electronic coils.
Solderable Enameled Wire Overview
Direct-solderable magnet wire is a copper conductor coated with a specially formulated polyurethane enamel that melts and dissolves in molten solder, allowing the wire to be tinned and terminated without mechanically stripping the insulation. This eliminates the need for separate enamel removal steps such as scraping, chemical stripping, or thermal burn-off, making solderable enameled wire a preferred choice for high-volume coil production where termination speed and consistency are critical.
Our direct-solderable enameled copper wire is built on a high-purity oxygen-free copper core that delivers consistently low electrical resistance and high current-carrying capacity. The polyurethane enamel insulation is applied through a multi-pass enameling process, forming a uniform, concentric, pinhole-free coating that solders cleanly at controlled temperatures while still providing dependable dielectric protection between adjacent coil turns.
Every spool of this magnet wire is optimized for automated high-speed coil winding. The surface is engineered for low friction and smooth layer crossover, while the annealed copper core provides balanced elongation and flexibility. The result is enameled wire that feeds cleanly, bends tightly, and retains coil shape without enamel cracking or peeling — and then solders directly at the termination stage to streamline your assembly process.
Direct Solderability
The polyurethane enamel on this magnet wire breaks down in molten solder at designated temperatures, so the enameled copper wire can be tinned and joined directly without stripping. This reduces termination time, eliminates scrap from mechanical stripping damage, and improves joint consistency in relay, solenoid, and transformer coil assembly.
Electrical Efficiency
The high-purity copper core in our solderable enameled wire minimizes resistive losses and heat generation, supporting the energy efficiency of motor windings, transformer coils, and inductor assemblies. Consistent conductivity across every spool of magnet wire ensures predictable electromagnetic performance in mass production.
Smooth Winding Performance
A low-friction surface finish allows this magnet wire to cross over and layer cleanly during high-tension automatic winding. The enameled wire resists snagging, tangling, and surface scuffing, helping coil manufacturers achieve uniform, compact windings with fewer rejects before direct soldering.
Solderable Magnet Wire Engineering Characteristics
Insulation System
Solderable Polyurethane Enamel Coating
The insulation on our direct-solderable enameled copper wire is built through repeated application and heat-curing cycles, producing a concentric polyurethane enamel film with no thin spots or weak points. This multi-layer construction gives the magnet wire dependable dielectric strength during winding and service, while still allowing the enamel to decompose cleanly in the solder pot for fast, reliable terminations.
- Directly solderable at controlled temperatures without mechanical or chemical enamel stripping.
- Strong resistance to scrape and abrasion during coil winding, insertion, and handling.
- Low moisture absorption helps preserve dielectric strength in humid operating environments.
Mechanical Properties
Elongation, Flexibility, and Adhesion
The copper conductor in our enameled wire is annealed under controlled conditions to achieve a precise balance of softness and tensile strength. This allows the magnet wire to stretch smoothly under winding tension, bend around small radii, and conform to compact coil geometries without conductor necking or enamel separation.
- Low spring-back helps wound coils hold their shape immediately after forming, reducing coil expansion and looseness.
- Strong enamel-to-copper adhesion prevents peeling and flaking during torsion, bending, and high-speed unspooling.
- Flexibility is maintained across both cold and warm operating conditions, making the enameled wire suitable for diverse coil applications.
Dielectric Performance
Reliable Inter-Turn Insulation
Magnet wire must reliably separate adjacent coil turns operating at different voltage potentials. Our solderable enameled copper wire uses a dense, continuous polyurethane film that delivers consistent breakdown voltage and stable inter-turn insulation across the full length of every spool.
- Controlled film concentricity minimizes the risk of pinholes, micro-voids, and localized voltage stress points.
- Consistent insulation thickness supports reliable performance in low-to-moderate voltage coil designs.
- Supports long-term insulation reliability, reducing the risk of turn-to-turn shorts and premature winding failure.
Termination Advantage
Streamlined Coil Assembly Without Stripping
Conventional enameled wire requires the insulation to be removed before soldering, adding process steps and risking conductor damage. Direct-solderable magnet wire removes this stage entirely: the coil leads can be tinned and soldered in one operation, reducing labor, improving throughput, and producing cleaner, more consistent solder joints on automated termination lines.
- No scraping, chemical stripping, or burn-off required before soldering coil terminations.
- Reduces risk of nicked or broken conductors caused by mechanical enamel removal.
- Ideal for high-volume production of relays, solenoids, small transformers, and electronic coils where every termination must be uniform and reliable.
Solderable Enameled Wire Technical Specifications
Our direct-solderable magnet wire range covers a broad spectrum of conductor sizes and insulation builds to support diverse coil winding and termination requirements. The table below summarizes the available configuration options for our solderable enameled copper wire.
| Specification | Available Range / Description |
|---|---|
| Conductor Material | High-purity oxygen-free copper for low resistance and high conductivity in magnet wire applications |
| Enamel Insulation Type | Direct-solderable polyurethane enamel; additional insulation formulations available on request |
| Wire Diameter Range | Fine gauge solderable magnet wire from 0.02 mm up to 1.00 mm and above |
| Insulation Build | Single, heavy, and triple enamel builds to match different voltage and slot-fill requirements |
| Thermal Class | Solderable enameled wire rated for continuous operation up to 155°C (Class F), with higher-temperature options available |
| Solderability | Directly solderable in molten solder without enamel stripping; soldering temperature varies by wire diameter |
| Dielectric Strength | Consistent breakdown voltage that scales with enamel thickness for reliable inter-turn insulation |
| Elongation | Controlled elongation characteristics tuned to conductor diameter for smooth, crack-free winding |
| Spool Packaging | Plastic spools in various sizes suited to manual, semi-automatic, and high-speed automatic winding |
When to Choose Direct-Solderable Magnet Wire
Direct-solderable enameled copper wire is the preferred choice when coil terminations need to be soldered quickly and consistently, especially in high-volume manufacturing. It is widely used in relays, solenoids, small transformers, inductors, voice coils, and electronic coils where stripping the enamel by hand or machine would slow production and risk damaging fine conductors. For applications involving higher operating temperatures or severe mechanical stress, non-solderable enameled wire with polyesterimide or polyamide-imide insulation may be more appropriate; our team can help you select the right magnet wire construction for each coil design.
In-Line Quality Inspection for Every Spool of Solderable Magnet Wire
Every meter of our direct-solderable enameled copper wire undergoes continuous in-line inspection during production. Laser diameter monitoring ensures consistent conductor and overall dimensions, while high-voltage spark testing detects any enamel discontinuity before the magnet wire is spooled and packaged. Solderability is also verified to confirm that the enamel breaks down cleanly and the copper wets properly, ensuring reliable terminations on your production line.
Solderable Magnet Wire Applications
Direct-solderable enameled copper wire is used wherever compact electromagnetic coils require fast, reliable soldered terminations. Our magnet wire serves a broad range of industries and product categories, including the following major application sectors.
Relays and Contactors
Fine gauge solderable magnet wire is wound into relay coils where direct tinning of lead wires speeds up assembly and ensures uniform electrical contacts across high-volume production runs.
Solenoids and Valves
Solenoid coils, pneumatic and hydraulic valve coils, and electromagnetic actuator coils use direct-solderable enameled wire for efficient termination and consistent inter-turn insulation.
Small Transformers and Inductors
Signal transformers, pulse transformers, common-mode chokes, and PCB inductors are wound with solderable magnet wire that connects directly to terminals or pins without enamel removal.
Audio Voice Coils
Speaker voice coils, headphone drivers, and microphone coils use fine enameled copper wire where direct solderability simplifies lead-out connections and compact winding is essential.
Automotive Sensor Coils
Crankshaft sensors, ABS sensor coils, ignition module coils, and other automotive electromagnetic components rely on solderable magnet wire for dependable connections in compact packages.
Electronic Coils and Chokes
Switched-mode power supply chokes, filter inductors, line filters, and toroidal coils use direct-solderable enameled wire for fast termination on bobbins, pins, and PCBs.
Household Appliance Controls
Timer coils, relay coils in washing machines and air conditioners, and small motor control coils benefit from the efficient soldering and reliable insulation of this magnet wire.
Instrumentation and Meters
Moving-coil meters, measuring instrument coils, and precision electromagnetic components use fine gauge solderable enameled copper wire for accurate winding and clean terminations.
Magnet Wire Insulation Types at a Glance
While this page focuses on direct-solderable magnet wire, different coil applications may call for different enameled wire constructions. The summary below helps you compare insulation options when selecting enameled copper wire for a specific product.
Polyurethane (Solderable)
Polyurethane magnet wire is directly solderable without stripping, making it ideal for relays, solenoids, small transformers, and electronic coils. It offers good moisture resistance and stable dielectric performance in low-to-moderate temperature applications, and it is the default choice when termination efficiency is a priority.
Polyester / Polyesterimide
Polyester and polyesterimide enameled wire provide higher thermal ratings and improved thermal aging resistance for general-purpose motors, compressors, and industrial transformers. These magnet wire types are not directly solderable and require enamel removal before termination, but they withstand sustained heat and electrical stress well.
Polyamide-Imide Overcoat
Dual-coat magnet wire with a polyamide-imide overcoat delivers the highest abrasion resistance, thermal performance, and chemical durability. It is specified for hermetic motors, traction motors, and high-temperature coils where reliability under severe conditions outweighs the need for direct solderability.
Insulation Build Options for Solderable Magnet Wire
Direct-solderable enameled wire is available in different insulation builds to balance coil compactness against dielectric strength. Single-build enameled wire offers the smallest overall diameter and is preferred where slot or winding space is tight and voltage stress is moderate. Heavy-build and triple-build enameled copper wire provide thicker polyurethane insulation for higher voltage protection and improved mechanical resistance, with a slightly larger overall diameter. Choosing the appropriate build ensures that the magnet wire meets both the electrical clearance requirements and the dimensional constraints of the coil design while retaining reliable direct-solderable performance.
Solderable Magnet Wire Packaging, Storage, and Handling
Proper packaging, storage, and handling preserve the solderability, electrical performance, and mechanical integrity of direct-solderable enameled copper wire from the factory to the winding machine. Following these recommendations helps prevent enamel damage, oxidation, and contamination that can compromise magnet wire termination and winding quality.
Spool Design
Our solderable enameled wire is wound onto reinforced plastic spools engineered for smooth, tangle-free unspooling on both manual and automatic winding equipment. Balanced winding tension prevents overlaps, snags, and sudden snatching that could stretch the magnet wire or damage the enamel surface before soldering.
Protective Packaging
Each spool of direct-solderable enameled copper wire is individually protected to prevent physical damage, dust contamination, and moisture exposure during transit and storage. Clean packaging is especially important for solderable magnet wire, since surface contamination can interfere with solder wetting at termination.
Environmental Protection
The protective enclosure shields the enameled wire from humidity, atmospheric pollutants, and abrasive particles that could degrade insulation performance, oxidize the copper, or impair solderability before the coil is assembled and soldered.
Storage and Handling Recommendations for Solderable Enameled Wire
- Storage conditions: Store solderable magnet wire in a clean, dry, dust-free environment with temperatures between 10°C and 30°C and relative humidity below 60% to prevent copper oxidation that can reduce solder wetting.
- Avoid impacts: Handle enameled wire spools carefully. Dropping or striking a spool can crack the flanges or nick the polyurethane enamel, creating weak points that lead to dielectric failure or poor soldering.
- Control unspooling tension: Set winding machine tension appropriately for the magnet wire diameter. Excessive tension over-stretches the enameled copper wire, reducing conductor cross-section and thinning the insulation film.
- Keep solder areas clean: When terminating direct-solderable enameled wire, use clean, temperature-controlled solder pots and appropriate flux to ensure the polyurethane enamel breaks down fully and the copper wets consistently.
- Prevent chemical exposure: Keep enameled wire away from corrosive vapors, acidic environments, and moisture until the coil has been soldered and, where applicable, varnish-impregnated or encapsulated.
- First-in, first-out rotation: Use solderable enameled copper wire in the order it is received to minimize storage time and ensure the magnet wire is processed while its solderability and surface condition are at their best.
Shipping & Return
xReturns Policy
You may return items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
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