China Stainless Steel
stainless steel
needle tube
TeCarve’s Stainless Steel Needle Tube products are precisely engineered for micro-diameter applications demanding tight tolerances, smooth inner surfaces, and exceptional corrosion resistance.
These ultra-fine tubes are commonly used in medical devices, industrial instrumentation, analytical equipment, and fluid delivery systems. Manufactured from high-grade stainless steel, our needle tubes maintain dimensional stability and chemical purity, making them ideal for high-precision and hygienic environments.
Available in seamless or welded variants, with custom OD, wall thickness, and cut-to-length options, TeCarve guarantees clean inner bores, tight dimensional control, and mirror-like finishes to meet the strictest performance demands.
Specifications
Available Sizes by Standard
Markets: Global — stainless steel needle tubing for medical device manufacture (hypodermic gauge series)
| Gauge (G) | OD Min (mm) | OD Max (mm) | Wall Class Options |
|---|---|---|---|
| 18G | 1.200 | 1.300 | Regular / Thin / Extra-Thin |
| 19G | 1.030 | 1.100 | Regular / Thin / Extra-Thin / Ultra-Thin |
| 20G | 0.860 | 0.920 | Regular / Thin / Extra-Thin / Ultra-Thin |
| 21G | 0.800 | 0.830 | Regular / Thin / Extra-Thin / Ultra-Thin |
| 22G | 0.698 | 0.730 | Regular / Thin / Extra-Thin |
| 23G | 0.600 | 0.673 | Regular / Thin / Extra-Thin |
| 25G | 0.500 | 0.530 | Regular / Thin |
| 27G | 0.400 | 0.420 | Regular / Thin |
| 29G | 0.324 | 0.351 | Regular / Thin / Extra-Thin / Ultra-Thin |
| 30G | 0.298 | 0.320 | Regular / Thin / Extra-Thin / Ultra-Thin |
| 31G | 0.254 | 0.267 | Regular / Thin / Extra-Thin / Ultra-Thin |
| 32G | 0.229 | 0.241 | Regular / Thin / Extra-Thin / Ultra-Thin |
Per ISO 9626:2016(E) Table 1: OD is a hard min/max range (not a nominal ± tolerance) — corrected 2026-08-05, previous version approximated it as nominal±tolerance which understated some gauges’ real upper bound. Wall class availability (Regular/Thin/Extra-Thin/Ultra-Thin) also corrected per gauge to match the standard’s own table; minimum ID per wall class available on request.
- Supply Length / Form: Coils or straight cut lengths; custom lengths available
- Available Grades: 304, 304L, 316, 316L
- Surface Finish: Polished or bright annealed, ID/OD both pickled & passivated
- Tolerance Compliance: Per ISO 9626, ASTM A269, EN 10216-5, JIS G3459, or GB/T 13296 small-diameter tolerance tables
Markets: N. America — small-diameter seamless & welded corrosion-resisting tube
| OD (mm) | WT (mm) | OD Tol. | WT Tol. |
|---|---|---|---|
| 0.90 | 0.15 | ±0.13mm | ±15% |
| 1.59 | 0.20 | ±0.13mm | ±15% |
| 2.38 | 0.28 | ±0.13mm | ±15% |
| 3.18 | 0.35 | ±0.13mm | ±15% |
| 4.76 | 0.49 | ±0.13mm | ±15% |
| 6.35 | 0.71 | ±0.13mm | ±15% |
Per ASTM A269/A269M-15a Table 4: all sizes shown fall in Group 1 (OD up to ½in [12.7mm]), which uses a flat ±0.005in[0.13mm] OD tolerance and ±15% wall tolerance — not a percentage-of-OD approximation, and not the ±10% wall tolerance used by larger Group 2+ sizes.
- Supply Length / Form: Coils or straight cut lengths; custom lengths available
- Available Grades: 304, 304L, 316, 316L
- Surface Finish: Polished or bright annealed, ID/OD both pickled & passivated
- Tolerance Compliance: Per ISO 9626, ASTM A269, EN 10216-5, JIS G3459, or GB/T 13296 small-diameter tolerance tables
Markets: Europe, Middle East — small-diameter precision tube
| OD (mm) | WT (mm) | OD Tol. | WT Tol. |
|---|---|---|---|
| 1.0 | 0.20 | ±0.03mm (±3.0%) | ±0.03mm (±12.5%) |
| 2.0 | 0.30 | ±0.05mm (±2.5%) | ±0.04mm (±12.5%) |
| 3.0 | 0.40 | ±0.08mm (±2.5%) | ±0.05mm (±12.5%) |
| 4.0 | 0.50 | ±0.10mm (±2.5%) | ±0.06mm (±12.5%) |
| 6.0 | 1.0 | ±0.15mm (±2.5%) | ±0.13mm (±12.5%) |
- Supply Length / Form: Coils or straight cut lengths; custom lengths available
- Available Grades: 304, 304L, 316, 316L
- Surface Finish: Polished or bright annealed, ID/OD both pickled & passivated
- Tolerance Compliance: Per ISO 9626, ASTM A269, EN 10216-5, JIS G3459, or GB/T 13296 small-diameter tolerance tables
Markets: Japan, Southeast Asia — small-diameter precision tube
| OD (mm) | WT (mm) | OD Tol. | WT Tol. |
|---|---|---|---|
| 1.0 | 0.20 | ±0.10mm (±10.0%) | ±0.03mm (±12.5%) |
| 2.0 | 0.30 | ±0.15mm (±7.5%) | ±0.04mm (±12.5%) |
| 3.0 | 0.40 | ±0.20mm (±6.7%) | ±0.05mm (±12.5%) |
| 4.0 | 0.50 | ±0.25mm (±6.3%) | ±0.06mm (±12.5%) |
| 6.0 | 1.0 | ±0.30mm (±5.0%) | ±0.13mm (±12.5%) |
- Supply Length / Form: Coils or straight cut lengths; custom lengths available
- Available Grades: 304, 304L, 316, 316L
- Surface Finish: Polished or bright annealed, ID/OD both pickled & passivated
- Tolerance Compliance: Per ISO 9626, ASTM A269, EN 10216-5, JIS G3459, or GB/T 13296 small-diameter tolerance tables
Markets: China domestic & Belt-and-Road — small-diameter precision tube
| OD (mm) | WT (mm) | OD Tol. | WT Tol. |
|---|---|---|---|
| 1.0 | 0.20 | ±0.05mm (±5.0%) | ±0.03mm (±12.5%) |
| 2.0 | 0.30 | ±0.06mm (±3.0%) | ±0.04mm (±12.5%) |
| 3.0 | 0.40 | ±0.08mm (±2.7%) | ±0.05mm (±12.5%) |
| 4.0 | 0.50 | ±0.10mm (±2.5%) | ±0.06mm (±12.5%) |
| 6.0 | 1.0 | ±0.12mm (±2.0%) | ±0.13mm (±12.5%) |
- Supply Length / Form: Coils or straight cut lengths; custom lengths available
- Available Grades: 304, 304L, 316, 316L
- Surface Finish: Polished or bright annealed, ID/OD both pickled & passivated
- Tolerance Compliance: Per ISO 9626, ASTM A269, EN 10216-5, JIS G3459, or GB/T 13296 small-diameter tolerance tables
Standards
→ Scroll right for full chemistry & mechanical data
| Grade | US (UNS) | EN (W.Nr.) | Japan (JIS) | China (GB/T) | C % (Max) | Si % (Max) | Mn % (Max) | P % (Max) | S % (Max) | Cr % | Ni % | Mo % | Tensile σb (Min.) | Yield σ0.2 (Min.) | Elongation (Min.) | Hardness (Max) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 304 | S30400 | 1.4301 | SUS304 | 06Cr19Ni10 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤92 HRB / ≤215 HV |
| 304L | S30403 | 1.4307 | SUS304L | 022Cr19Ni10 | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | — | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | ≤92 HRB / ≤215 HV |
| 316 | S31600 | 1.4401 | SUS316 | 06Cr17Ni12Mo2 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 316L | S31603 | 1.4404 | SUS316L | 022Cr17Ni12Mo2 | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 321 | S32100 | 1.4541 | SUS321 | 06Cr18Ni11Ti | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 17.0-19.0 | 9.0-12.0 | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
- Standards Conformance: ASTM A269/A632 · EN 10216-5 · JIS G3459/G3468 · GB/T 24593/13296 · ISO 9626
- Delivery Condition: Solution Annealed & Pickled (AP) / Bright Annealed (BA) / Polished, or as requested.
- Mill Test Certificate: 100% full material traceability with EN 10204 3.1 MTC provided with every shipment.
Features
• Ultra-fine and precise diameters
• Biocompatible and corrosion-resistant
• Smooth internal surface
• High dimensional consistency
• Medical and surgical needles
• Laboratory and analytical instruments
• Capillary fluid transport
• Precision industrial dispensing
Applications
For medical and analytical micro-tubing requirements, review our factory verification procedures, precision gauge inspection, dimensional tolerance control, and clean packaging standards.
Quality Control
• Laser micrometer dimensional testing
• Inner bore inspection with endoscopy
• Surface finish verification
• Chemical and mechanical property analysis
packaging
PVC Wrapping
& End Caps
Custom Barcoding
& Labeling
Anti-Corrosion
& Moisture Protection
Seaworthy Wooden Cases & Pallets
Needle Tube Inspection & Packaging Photos
Real factory, inspection, packaging and loading photos from TeCarve gallery pages.
Tailored Solutions, Timely Fulfillment
CUSTOMIZATION
& DELIVERY
Flexible Custom Manufacturing
We customize stainless steel needle tube by outer diameter, wall thickness, cut length or coil form, grade, polished or bright-annealed finish, tube type, and medical-grade dimensional tolerances already defined for the product.
Low MOQ & Rapid Prototyping
Small batch customization and sample production are supported, helping you shorten your development cycle and market entry.
Optimized Lead Time
Most orders ship within 10–25 days after deposit. Exact timing depends on product specification, required documentation, and order volume.
Global Logistics & On-Time Delivery
For needle tube deliveries to over 50 countries, PVC wrapping and end caps combine with anti-corrosion and moisture protection to protect fine tube surfaces and ends.
Frequently Asked Questions
What is stainless steel needle tube (hypodermic tube)?
Stainless steel needle tube, also called hypodermic tubing, is precision thin-wall tube used to manufacture medical needles, cannulas, and syringes. It conforms to ISO 9626 and ASTM A908 for dimensional and mechanical requirements for needle tubing.
What gauge sizes does TeCarve supply for needle tube?
TeCarve supplies stainless steel needle tube within the published product specification range: outer diameter 0.3 mm to 6 mm and wall thickness 0.1 mm to 1.0 mm. Non-standard OD and wall combinations can be reviewed against the drawing and application requirements.
What material grade is specified for hypodermic needle tubing?
ISO 9626 specifies grade 304 and 316L stainless steel for hypodermic tubing. Grade 316L is preferred for prolonged or implantable body contact due to its improved corrosion resistance and superior biocompatibility.
How is needle tube different from capillary tube?
Needle tube (hypodermic tubing) is produced to the ISO 9626 gauge system specifically for medical needle manufacturing with very thin walls and precise tolerances. Capillary tube covers a broader size range for industrial, scientific, and medical use outside the hypodermic gauge system.
What tip processing and surface treatments are available?
TeCarve supplies needle tube cut-to-length with plain, deburred, or ground-bevel ends. Custom tip geometry (bevel, lancet, back-bevel), electropolishing, and passivation per ASTM A967 are all available.