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Cleaned and burr-free capillary tubes are precision small-diameter tubes engineered for thermal management systems. They function as micro heat transfer tubes, core tubes, sensing tubes, cooling tubes, and flow channels in aerospace heat exchangers and compact microtube heat exchanger cores. These tubes undergo specialized manufacturing processes to achieve smooth internal surfaces, clean bores, and burr-free ends.
In aerospace heat exchanger applications, tube cleanliness and burr-free tube ends are critical factors affecting system performance. Small internal diameters are susceptible to obstruction by particles, oil residue, metal chips, burrs, and surface contamination. These defects may cause flow restriction, blockage, leakage, increased pressure drop, reduced heat transfer efficiency, or assembly failure. Our capillary tubes are manufactured with strict dimensional control, smooth internal surfaces, clean bores, burr-free ends, and protected packaging to address these challenges.
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Parameter | Range |
Outer Diameter (OD) | 0.2 - 6.0 mm |
Wall Thickness (WT) | 0.02 - 1.50 mm |
Maximum Straight Length | ≤12 mtrs |
Maximum Coil Length | ≤ 500 m |
Available Types | Straight, Coil |
Fabrication | As per drawing or sample |
Heat treatment: Annealing/BA/Solution treated, stress released, QT
Material hardness: Cold hardened, half hardened, 1/4 hardened, soft
Surface condition: Pickled, passivated, bright, grinded, polished, cleaned, sanitary level
Material | Suitable Applications |
304 / 304L Stainless Steel | General compact heat exchangers, low-corrosion cooling systems |
316L Stainless Steel | Aerospace heat exchangers, oil coolers, condensers, evaporators, cryogenic systems, hydrogen-related systems |
321 Stainless Steel | High temperature and oxidation-resistant heat exchanger applications |
310S Stainless Steel | High temperature thermal systems |
Duplex 2205 | High strength and chloride corrosion resistance |
Super Duplex 2507 | Seawater, offshore, and severe corrosion environments |
904L Stainless Steel | Chemical and acid-resistant heat exchanger systems |
Inconel 625 | Aerospace, high temperature, high pressure, bleed air coolers, supercritical CO₂ heat exchangers |
Inconel 600 / 601 | High temperature oxidation-resistant applications |
Incoloy 800 / 825 | High temperature and corrosive service |
Hastelloy C276 | Severe corrosion, acid-resistant and chemical heat exchangers |
Titanium Grade 2 / Grade 5 | Lightweight, seawater, chemical, and aerospace heat exchanger applications |
Our capillary tubes are suitable for various aerospace thermal management systems:
Aerospace Heat Exchangers: Used where compact size, low weight, clean internal surfaces are required
Bleed Air Coolers: For cooling hot compressed air from aircraft engines or auxiliary systems
Oil Coolers: For aircraft lubrication oil, hydraulic oil, and fuel-oil cooling systems
Radiators: In lightweight compact radiators requiring low air-side pressure drop
Intercoolers: In charge air cooling and liquid-to-air cooling systems
Condensers and Evaporators: In refrigerant heat exchangers and two-phase flow systems
Liquid-Liquid Heat Exchangers: In compact cooling systems with two liquid media
Cryogenic Recuperators: In LNG, hydrogen, and low-temperature recovery systems
Microtube Heat Exchanger Cores: As core tubes or tube bundle tubes between tube sheets
Inspection Item | Purpose |
OD Inspection | Ensure accurate tube sheet assembly and sealing |
ID Inspection | Ensure stable flow rate and pressure drop control |
Wall Thickness Inspection | Ensure pressure resistance and heat transfer performance |
Roundness Inspection | Improve assembly accuracy and flow stability |
Straightness Inspection | Ensure smooth tube bundle assembly |
Length Inspection | Meet cut-to-length and drawing requirements |
Tube End Inspection | Confirm burr-free, clean-cut, and chamfered ends |
Inner Surface Cleanliness Inspection | Check oil, particles, chips, residue, and contamination risk |
Surface Inspection | Check scratches, dents, oxidation, pits, stains, and handling marks |
Air Blowing / Flushing Inspection | Confirm tube bore is open and clean |
Particle / Residue Check | For precision cleaning requirements where applicable |
PMI Test | Verify material grade |
Chemical Composition Test | Confirm material compliance |
Mechanical Test | Check tensile strength, yield strength, and elongation |
Hardness Test | Confirm material condition where required |
Hydrostatic Pressure Test | Verify pressure resistance |
Air Pressure Test | Check leakage risk |
Air Under Water Leak Test | Detect visible leakage |
Helium Leak Test | For aerospace, cryogenic, vacuum, and high-reliability applications |
Eddy Current Testing | Detect surface and near-surface defects where applicable |
Ultrasonic Testing | Detect internal defects where tube size allows |
Packaging Inspection | Confirm capped ends, sealed packaging, and contamination protection |
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We supply cleaned and burr-free capillary tubes according to customer drawings, samples, or technical specifications. Available supply forms include straight length, cut-to-length, seamless precision, welded and redrawn, stainless steel, nickel alloy, titanium, cleaned and capped, burr-free micro tubes, chamfered end, tubes for tube sheet assembly, and tubes for aerospace heat exchanger cores.
Straight capillary tubes are available in lengths up to 12 meters. Custom cut-to-length options are also provided according to specific requirements.
316L stainless steel and nickel alloy capillary tubes are recommended for cryogenic applications due to their low-temperature toughness and leak-tight performance.
We offer burr-free cut ends, chamfered ends, and capped ends to protect the tubes during transportation and storage.
