Measure the hole or shaft your tube needs to fit around or inside. The OD (outer diameter) is the total width of the tube; the ID (inner diameter) is the usable inner bore. All variants in this listing have a 0.2mm wall thickness, so ID = OD − 0.4mm. For example, the 3mm OD tube has a 2.6mm ID (≈0.10" bore). The length is a fixed 500mm (≈19.7"), which you can cut to your required size with a tube cutter or fine-tooth saw.

Brass (typically a copper-zinc alloy) generally has a tensile strength of around 300–500 MPa depending on the specific alloy temper. For light structural, decorative, or model-making applications these tubes are typically more than adequate. For heavy load-bearing or pressure applications, please contact us to confirm the specific alloy grade before ordering.

Brass is naturally corrosion-resistant and generally performs well in most indoor and moderately humid environments. In marine or highly corrosive outdoor settings, brass will typically develop a patina (greenish oxidation) over time. For prolonged outdoor exposure, applying a clear lacquer or protective sealant is recommended to maintain the original golden appearance.

Yes — all dimensions are metric (OD and ID in millimeters), making these tubes compatible with standard metric fittings, sleeves, and connectors. Always verify the OD and ID of your fitting against the specific variant dimensions before ordering. These tubes are smooth-bore and not threaded.

Brass is one of the most machinable and solderable metals available. These tubes can generally be cut with a tube cutter or fine-tooth saw, drilled, soldered with standard rosin-core solder, and brazed. The thin 0.2mm wall requires care when cutting to avoid deformation — a sharp tube cutter or jeweler's saw is strongly recommended, especially for diameters under 3mm OD.

For fine jewelry findings and micro-scale model making, sizes in the 0.8mm–2mm OD range are typically used. For larger architectural models, RC vehicle frames, or structural jewelry components, the 3mm–10mm OD range is more common. If you need a tube to slide over a wire or rod, choose an ID slightly larger than the wire diameter — remember ID = OD − 0.4mm for all variants.

Each order includes one tube of 500mm length in your selected OD × ID size. If you need multiple pieces or bulk quantities for production or wholesale purposes, please contact us — we can typically accommodate larger orders at adjusted pricing.