Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length
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Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm LengthBrass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length

Brass Round Tube 0.25mm Wall Thickness — OD 1mm to 12.5mm, 300mm Length

HomeDIYer
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By HomeDIYer®

Price:
$7.56 USD
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In stock (500 units), ready to be shipped

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Description

Brass Round Tube 0.25mm Wall — Precision Thin-Wall Tubing for Models, Instruments & DIY

Whether you're building a scale model, repairing a musical instrument, fabricating a custom jig, or routing a small fluid line, finding a brass round tube in exactly the right diameter is often the hardest part. Oversized tubes waste material; undersized ones won't fit. This listing solves that problem with 22 carefully stepped metric sizes — all sharing a consistent 0.25mm wall thickness — so you can pick the exact OD-to-ID ratio your project demands.

Each tube is made from brass (copper-zinc alloy) and measures 300mm (≈11.8″) in length. Outside diameters range from 1mm (≈0.039″) to 12.5mm (≈0.492″), with inside diameters stepping accordingly (e.g., 1mm OD × 0.5mm ID, 6mm OD × 5.5mm ID, 12.5mm OD × 12mm ID). Wall thickness is a uniform 0.25mm throughout the range. Tubes are sold individually — select your size from the variant dropdown above.

Typical use cases include scale model brass tubing for railway and aircraft builds, telescope sleeve assemblies where adjacent sizes nest inside one another, small instrument repair (flute, clarinet, and brass instrument keywork), custom pen-making mandrels, and light-duty fluid or air routing in hobby CNC and pneumatic setups.

ℹ️ Metric sizing: All OD and ID dimensions are in millimeters. Adjacent sizes in this range are generally designed to telescope — the ID of one size closely matches the OD of the next smaller size. Verify your required bore before ordering.

✅ Key Features of These Brass Round Tubes

  • 📐22 Stepped Metric Sizes — OD from 1mm to 12.5mm in fine increments, giving you precise control over wall clearance for telescope sleeve and nesting tube assemblies.
  • 🔩Consistent 0.25mm Wall — Uniform thin wall across all sizes ensures predictable fit and weight, critical for scale model brass tubing and instrument keywork repairs.
  • ✂️Easy to Cut and Machine — Brass machines cleanly with standard hobby tools; cuts without burring when supported, and accepts soldering, brazing, and light threading.
  • 🛡️Natural Corrosion Resistance — Brass resists oxidation in typical indoor and light outdoor environments, making it a reliable choice for small-diameter brass pipe for hobby and craft projects that need longevity.
  • 🔗Solderable and Brazeable — Joins readily with rosin-core solder and standard flux, enabling clean, strong connections for custom brass tube fittings and structural assemblies.
  • 📦300mm Ready-to-Use Length — At 300mm (≈11.8″), each tube provides enough material for most hobby and instrument applications with room to cut to final length on-site.

📐 Technical Specifications — Brass Round Tube

Material Brass (copper-zinc alloy)
Wall Thickness 0.25mm (uniform across all sizes)
Outside Diameter (OD) Range 1mm (≈0.039″) — 12.5mm (≈0.492″)
Inside Diameter (ID) Range 0.5mm — 12mm (OD minus 0.5mm)
Length 300mm (≈11.8″)
Available Sizes (OD × ID) 1×0.5, 1.2×0.7, 1.5×1, 1.8×1.3, 2×1.5, 2.5×2, 3×2.5, 3.5×3, 4×3.5, 4.5×4, 5×4.5, 5.5×5, 6×5.5, 6.5×6, 7×6.5, 8×7.5, 8.5×8, 9.5×9, 10×9.5, 10.5×10, 12×11.5, 12.5×12 (all in mm)
Tube Form Round, seamless-appearance hollow tube
Finish See variant options
Quantity per Order 1 tube per variant selected
Country of Manufacture China
⚠️ Confirm your size before ordering. Due to the close stepping between sizes, please double-check both OD and ID against your project requirements. If you need a size not listed, contact us to confirm availability.

❓ Frequently Asked Questions

How do I choose the right OD and length for my project?

Start with the inner diameter (ID) your application requires, then add the wall thickness to get the OD. For example, if you need a 3mm bore, choose the 3.5mm OD × 3mm ID variant (0.25mm wall each side). All tubes in this listing are 300mm (≈11.8″) long — cut to length with a fine-tooth saw or tube cutter as needed.

What load or pressure can these brass tubes handle?

These are thin-wall decorative and precision-fit tubes (0.25mm wall). They are generally suitable for light structural, model-making, and instrument applications. For high-pressure fluid lines or heavy structural loads, a thicker-wall tube is recommended. Contact us to confirm suitability for your specific application.

Are these tubes suitable for outdoor or humid environments?

Brass offers naturally good corrosion resistance compared to mild steel and is typically suitable for indoor humid environments and light outdoor use. For prolonged saltwater or harsh outdoor exposure, consider applying a clear lacquer or sealant coating to extend service life.

What thread or fitting standards are compatible with these tubes?

These are unthreaded round tubes. OD dimensions follow metric sizing (1mm–12.5mm), making them compatible with standard metric fittings, collets, and bushings. For imperial fittings, verify the OD in inches: 1mm ≈ 0.0394″. For example, the 6mm OD tube is approximately 0.236″.

Can I solder or braze these brass tubes?

Yes. Brass is generally easy to solder with standard rosin-core or acid-core solder and a suitable flux. It is also brazeable with silver brazing alloy. Clean the surface with fine sandpaper or apply flux before joining for best adhesion and a clean fillet.

How do I cut these tubes cleanly without deforming them?

For the smallest diameters (1mm–3mm), a sharp hobby knife or fine-tooth jeweler's saw works well. For larger sizes (4mm and up), a mini tube cutter or a miter saw with a non-ferrous blade typically produces the cleanest, burr-free cut. Always support the tube along its length to prevent oval deformation during cutting.

Can these tubes be used as telescope sleeves or nesting tubes?

Yes — because each size steps up by approximately 0.5mm in OD and the wall is a consistent 0.25mm, adjacent sizes in this range are generally designed to telescope or nest inside one another with a close sliding fit. For example, the 2mm OD tube typically slides inside the 2.5mm OD tube. This makes the set ideal for multi-stage telescope sleeve assemblies in model and instrument work.

🛒 Select your size (OD × ID) above, then add to cart — ships from our US warehouse.

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