Medical Stainless Steel 304 Precision Capillary Tube For Hypodermic Needles ISO9626 1.4301
Medical grade stainless steel micro capillary tubes are small-diameter hollow high-precision tubes made from stainless steel 304 grade, which are usually used in medical devices and equipments, like injection needle tubes, infusion needle tubes, IV cannulas, catheters, etc.. These capillary tubes are known for their high precision, good durability, good formability, strength, and excellent resistance to corrosion. These stainless steel capillary tubes are not the final needle tubes but they are the essential raw material that medical needle tube manufacturers use. They are cold drawn to highly precise dimensions and undergo rigorous processing to ensure they meet the stringent demands of piercing human skin and delivering or extracting fluids safely.
Our company has manufactured stainless steel capillary tubes for more than 30 years, not only used for medical devices, but also for industrial applications. For medical use, these capillary tubes are usually cut into fixed needle tube length and ground with special bevel needle tips. Our medical capillary tubes are produced according to ISO9626 standard, which have tight dimensional tolerance and good surface. We can also provided based on clients’ detailed tolerance requirements.
Regular Sizes For Hypodermic Usage (Diameter, Wall Thickness, Length):
| Needle Gauge (G) |
Outer Diameter (OD) |
Common Wall Thickness (WT) |
Inner Diameter (ID) |
| 18G |
1.27 mm |
0.20 mm |
0.87 mm |
| 21G |
0.82 mm |
0.13 mm |
0.56 mm |
| 23G |
0.64 mm |
0.11 mm |
0.42 mm |
| 25G |
0.51 mm |
0.08 mm |
0.35 mm |
| 27G |
0.41 mm |
0.07 mm |
0.27 mm |
| 30G |
0.31 mm |
0.06 mm |
0.19 mm |
Length: Capillary tubes are generally supplied in straight lengths, commonly ranging from 1 to 2 meters, which are then cut to the required needle length(18mm, 25mm, 30mm, 32mm, 45mm, etc.).
Key Features Of Medical Capilalry Tubes:
- Excellent Corrosion Resistance: SS304 provides high resistance to body fluids, disinfectants
- High Biocompatibility: The material is non-toxic and non-reactive with human tissue
- Superior Dimensional Accuracy: Characterized by tight tolerances and a clean inside surface free from any oil, grease or other particles
- High Strength and Ductility
- Excellent Surface Finish: A smooth, polished internal and external surface minimizes fluid retention, reduces friction during insertion, and prevents bacteria adhesion.
- Suitable for punching, flattening, expanding, stretching and bending
Different Applications Of Stainless Steel Capillary Tubes:
The stainless steel capillary tubes are ideal for numerous medical and non-medical applications:
1. Medical Applications:
- Medlcia Needles: E.g., hypodermic needles, injection needles, blood collection needles, etc..
- Cannulas: For IV catheters, liposuction, irrigation, and drainage.
- Surgical Instruments: Components for guides, stylets, endoscopic tools, and biopsy needles.
- Implants: For orthopedic and dental devices.
- Microfluidic Systems: Used for laboratory equipment and diagnostic equipment.
2. Industrial & Non-Medical Applications:
- Chromatography
- Precision Fluid Transfer
- Temperature Sensor
- Precision Machinery
- Electronic Instruments
- Clock Accessories, Optical Fiber Accessories, Laser Engraving
- Decoration, Lighting Accessories
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