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Quality Precision 304 Stainless Steel Capillary Tube ASTM A269 Seamless Stainless Steel Tubing factory
Quality Precision 304 Stainless Steel Capillary Tube ASTM A269 Seamless Stainless Steel Tubing factory

Precision 304 Stainless Steel Capillary Tube ASTM A269 Seamless Stainless Steel Tubing

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

304 Stainless Steel Capillary Tube
Product Summary
304 stainless steel capillary tube is a precision small-diameter tube manufactured through cold drawing or cold rolling processes. It is widely used in medical devices, instrumentation, electronic components, and automatic control systems where high precision, cleanliness, and corrosion resistance ...

Product Details

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304 Stainless Steel Capillary Tube

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Precision SS Capillary Tube

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ASTM A269 Seamless Stainless Steel Tubing
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

304 stainless steel capillary tube is a precision small-diameter tube manufactured through cold drawing or cold rolling processes. It is widely used in medical devices, instrumentation, electronic components, and automatic control systems where high precision, cleanliness, and corrosion resistance are required.

Capillary tubes typically feature outer diameters ranging from 0.3mm to 8.0mm with wall thicknesses as thin as 0.1mm. The 304 austenitic stainless steel grade provides excellent corrosion resistance, good mechanical properties, and outstanding formability.

Specification
Specification Details
Product Name 304 Stainless Steel Capillary Tube
Material Grade 304 / SUS304 (UNS S30400, 1.4301)
Outer Diameter (OD) 0.3mm – 8.0mm
Wall Thickness (WT) 0.1mm – 1.5mm
Length Cut to size (100mm – 6000mm)
Manufacturing Process Cold drawn / Cold rolled
Surface Finish Pickled, annealed, polished, bright annealed (BA)
Key Features
  • High dimensional accuracy – Tight tolerances up to ±0.02mm on OD and ID
  • Smooth inner/outer surface – Low friction, minimal flow resistance
  • Excellent corrosion resistance – 18% chromium provides reliable protection
  • Good ductility – Easy to bend, flare, and swage
  • Clean, burr-free ends – Ready for assembly
  • Full traceability – MTR provided with heat number
Chemical Composition (%)
Element 304 Standard Typical Value
C ≤0.08 0.05-0.07
Si ≤0.75 0.45-0.55
Mn ≤2.00 1.20-1.50
P ≤0.045 ≤0.035
S ≤0.030 ≤0.020
Cr 18.00-20.00 18.20-18.80
Ni 8.00-10.50 8.20-8.80

*Source: ASTM A269 / A213*

Mechanical Properties
Property Value
Tensile Strength ≥520 MPa
Yield Strength (0.2%) ≥205 MPa
Elongation ≥35%
Hardness (HRB) ≤90
Density 7.93 g/cm³
Melting Point 1398 – 1420℃
Available Sizes (Common)
OD (mm) Wall Thickness (mm) ID (mm) Typical Use
0.50 0.10 0.30 Hypodermic needle
0.80 0.15 0.50 Medical cannula
1.00 0.20 0.60 Sensor probe
1.60 0.30 1.00 Instrument tube
2.00 0.30 1.40 Hydraulic line
2.50 0.40 1.70 Gas sampling line
3.00 0.50 2.00 Capillary column
4.00 0.50 3.00 Cooling coil
5.00 0.60 3.80 Instrumentation
6.00 0.80 4.40 Control line

Custom sizes available upon request. Minimum OD 0.3mm, minimum WT 0.1mm.

Applications
  • Medical Devices – Hypodermic needles, cannulas, surgical instruments, biopsy needles, dental tools
  • Instrumentation – Pressure gauges, temperature sensors, flow meters, analytical instruments
  • Electronics – Fine wire guides, probe pins, sensor housings, semiconductor components
  • Automation – Pneumatic tubing, hydraulic pilot lines, solenoid valve tubes
  • Aerospace – Instrument lines, fuel delivery lines, control system tubing
  • Laboratory – Capillary columns for chromatography, sample loops, chemical sampling
  • General Precision – Watch components, miniature shafts, fine tubes for precision mechanisms
Why Choose Our 304 Capillary Tubes?
Advantage Description
Precision Manufacturing Advanced cold drawing equipment ensures consistent OD/ID tolerances
No Internal Burrs Special deburring process guarantees a clean, smooth internal surface
Cut to Length Custom lengths from 100mm to 6000mm – no waste
Flexible Packaging Plastic caps, foam protection, vacuum sealing, or wooden reels
Full Certification Mill Test Report (MTR) with each shipment
Fast Lead Time Stock sizes ready in 3-7 days
Competitive Pricing Direct factory pricing
Quality Standards

304 stainless steel capillary tubes comply with the following standards:

Standard Description
ASTM A269 Seamless and welded tubing for general service
ASTM A632 Seamless tubing for small diameter
GB/T 3090 Stainless steel small diameter seamless tubes (Chinese standard)
ISO 9626 Stainless steel needle tubing for medical devices

Third-party inspection available (SGS, BV, TÜV) upon request.

Packaging & Delivery
Packaging Method Protection
Plastic end caps Prevents internal contamination
Foam interlayers Protects surface finish
Vacuum sealing For ultra-clean applications
Wooden reels/spools For long lengths, easy dispensing
Export cartons Standard export packaging

Delivery: Stock items: 3-7 days; Custom sizes: 15-30 days.

FAQ (Frequently Asked Questions)

Q: What is the minimum OD available for 304 capillary tubes?

A: Our minimum outer diameter is 0.3mm with a wall thickness down to 0.1mm.

Q: What is the standard length?

A: Standard length is 3000mm or 6000mm. We also offer cut-to-size service from 100mm to 6000mm.

Q: Can you supply capillary tubes with a polished ID surface?

A: Yes. We can provide a bright annealed (BA) finish or an electropolished (EP) inner surface upon request.

Q: Do you provide custom deburring?

A: Yes. We offer precision end finishing – straight cut, square cut, or chamfered – no burrs on ID/OD.

Q: Are these tubes suitable for medical needle applications?

A: Yes. Our capillary tubes meet ISO 9626 requirements for hypodermic needle tubing.

Q: How can I get a quote?

A: Please provide OD, wall thickness, length, and quantity. We will reply within 24 hours.

Contact Us

Ready to order 304 stainless steel capillary tube or need a custom size? Send your inquiry with specifications, and we will respond with a competitive quote within 24 hours.

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