H65 Brass Capillary Tube – 300mm Hollow Round Pipe, 1mm–11mm OD

Measure the bore or fitting you need to pass through or connect to, then select an OD that is slightly smaller (slip fit) or matching (press fit). For example, if your fitting accepts a 3mm tube, choose the 3mm OD variant. All tubes in this listing are 300mm (≈11.8") long with a consistent 0.2mm wall thickness, so the inner diameter is always OD minus 0.4mm.

H65 brass generally has a tensile strength of around 340–440 MPa. Pressure capacity depends on OD, wall thickness, and application. With a 0.2mm wall, these tubes are typically suited for low-to-medium pressure fluid transfer, instrumentation lines, and model making — not high-pressure hydraulic systems. Consult an engineer for safety-critical applications.

H65 brass offers good corrosion resistance in most indoor and mildly humid environments. For prolonged outdoor exposure or contact with saltwater or aggressive chemicals, consider applying a protective coating or using a higher-grade alloy. In most cases, brass performs well in plumbing, HVAC, and general DIY applications.

These are plain (unthreaded) capillary tubes. They are generally compatible with standard compression fittings, push-fit connectors, and soldered/brazed joints sized to match the OD you select. Always verify the fitting's bore size against the tube OD before ordering. No threads are pre-cut — you can tap or die-cut threads yourself if needed.

Yes. H65 brass is machinable and can be cut with a tube cutter or fine-tooth saw, and bent with a tube bender (use a mandrel for small diameters to avoid kinking). Deburr cut ends before use. The 0.2mm wall on smaller diameters (1mm–3mm) requires extra care during bending to prevent collapse.

For prototyping or a single repair, 3 pcs is typically sufficient. For small production runs or projects requiring multiple cut lengths from one tube, 6–9 pcs offers a better cost-per-piece. The 15-pcs pack is best for workshop stock or recurring use. All packs contain the same 300mm tubes at the same OD/ID/wall specification.

H65 is a Chinese standard brass alloy (GB/T 2059) consisting of approximately 63–68% copper and the remainder zinc. It is known for good ductility, machinability, and moderate corrosion resistance — making it a common choice for capillary tubes, heat exchangers, precision fittings, and decorative metalwork.

Refrigeration capillary tubes are generally made from copper or specific copper-alloy grades and are rated for refrigerant pressures. These H65 brass tubes share the same thin-wall hollow round form factor and are suitable for similar low-pressure fluid routing applications, but are not pre-rated for refrigerant systems. Verify compatibility with your refrigerant and system pressure before use.