Copper Round Wire T2 Solid Red Copper Bare Line Ø 0.3/0.4/0.5/0.6/0.8/1/1.5~8mm

For fine filigree and delicate wire-wrapped pendants, Ø0.3–0.5 mm works well — it bends easily by hand and holds detail. For structural frames or heavier stone settings, Ø0.8–1.5 mm provides enough rigidity to hold shape without a jig. If you're making rings or bangles, Ø1.5–2.5 mm is a common starting point.

T2 bare copper wire is widely used for grounding conductors in low-voltage electrical work because of its low resistivity and corrosion resistance relative to other metals. However, this wire is uninsulated and unlisted as rated cable. Always verify that your local electrical code permits bare copper in your specific application and confirm the required cross-sectional area (mm²) for your current load before selecting a diameter.

Copper naturally oxidizes when exposed to air and moisture, forming a patina that ranges from light brown to dark brown or green (verdigris) over time. In most electrical applications this surface oxide does not significantly affect conductivity at the contact points. For jewelry or decorative use where appearance matters, you can apply a clear lacquer or anti-tarnish coating after forming. Storing unused wire in a sealed bag slows oxidation.

Yes. Because the wire is bare and uncoated, standard rosin-core or no-clean solder flux bonds directly to the copper surface without stripping. For best results, lightly abrade the contact area with fine sandpaper or a wire brush if the surface has oxidized, then apply flux before soldering. Freshly unspooled wire typically solders without any pre-treatment.

T2 (also written as TU2 or C11000 equivalent) is a commercially pure electrolytic tough-pitch copper with copper content ≥99.9%. It offers a good balance of electrical conductivity (typically ≥97% IACS), workability, and cost. Higher-purity grades (e.g., oxygen-free C10100) are used in audiophile or ultra-precision applications but are rarely necessary for standard coil winding, grounding, or craft work. T2 is the standard choice for most DIY and light industrial uses.

Shorter spools (1–2 M) are practical for single-use repairs, small jewelry pieces, or testing a gauge before committing to more. Longer spools (3–6 M) reduce the number of joins in continuous applications like coil winding or running a grounding conductor, which improves both electrical performance and structural integrity. Note that spool length varies by diameter — heavier gauges are available in shorter lengths because the same spool weight yields fewer meters.

Bare copper wire can be used for coil winding, but keep in mind that adjacent turns of bare wire will short-circuit unless you add inter-layer insulation (such as Kapton tape or insulating varnish between layers). For single-layer air-core coils or coils where turns are spaced, bare wire works directly. For multi-layer wound coils, enamel-coated magnet wire is typically the better choice. If your design specifically calls for bare copper, this wire is appropriate — just plan your insulation strategy accordingly.