Home » product » Capillary Tube » Details

Stainless Steel Capillary Tube Size Chart – Complete Dimensions Guide OD 0.30mm to 12.00mm

Author: Healsmed Category: Capillary Tube, product Date: 2026-05-18 20:02 Views: 2

Stainless Steel Capillary Tube Size Chart – Complete Dimensions Guide

Selecting the right capillary tube size is crucial for your project’s success. This comprehensive size chart covers the full range of stainless steel capillary tube dimensions available, from ultra-fine 0.30mm OD micro tubing to 12.00mm OD precision tubes, with detailed specifications for wall thickness, inner diameter, tolerances, and surface finish options.

Use this guide as a practical reference when specifying capillary tube dimensions for your application. All sizes listed are manufactured to ASTM A269 / A213 standards with tight tolerance control.

—

Complete Capillary Tube Size Chart

Outer Diameter (OD) Inner Diameter (ID) – 0.10mm WT Inner Diameter (ID) – 0.15mm WT Inner Diameter (ID) – 0.20mm WT Inner Diameter (ID) – 0.30mm WT Tolerance
0.30 mm 0.10 mm – – – ± 0.01 mm
0.40 mm 0.20 mm 0.10 mm – – ± 0.01 mm
0.50 mm 0.30 mm 0.20 mm 0.10 mm – ± 0.01 mm
0.60 mm 0.40 mm 0.30 mm 0.20 mm – ± 0.01 mm
0.70 mm 0.50 mm 0.40 mm 0.30 mm – ± 0.01 mm
0.80 mm 0.60 mm 0.50 mm 0.40 mm 0.20 mm ± 0.01 mm
0.90 mm 0.70 mm 0.60 mm 0.50 mm 0.30 mm ± 0.01 mm
1.00 mm 0.80 mm 0.70 mm 0.60 mm 0.40 mm ± 0.01 mm
1.20 mm 1.00 mm 0.90 mm 0.80 mm 0.60 mm ± 0.01 mm
1.50 mm 1.30 mm 1.20 mm 1.10 mm 0.90 mm ± 0.01 mm
1.80 mm 1.60 mm 1.50 mm 1.40 mm 1.20 mm ± 0.01 mm
2.00 mm 1.80 mm 1.70 mm 1.60 mm 1.40 mm ± 0.01 mm
2.50 mm 2.30 mm 2.20 mm 2.10 mm 1.90 mm ± 0.01 mm
3.00 mm 2.80 mm 2.70 mm 2.60 mm 2.40 mm ± 0.02 mm
3.50 mm 3.30 mm 3.20 mm 3.10 mm 2.90 mm ± 0.02 mm
4.00 mm 3.80 mm 3.70 mm 3.60 mm 3.40 mm ± 0.02 mm
5.00 mm 4.80 mm 4.70 mm 4.60 mm 4.40 mm ± 0.02 mm
6.00 mm 5.80 mm 5.70 mm 5.60 mm 5.40 mm ± 0.02 mm
8.00 mm 7.80 mm 7.70 mm 7.60 mm 7.40 mm ± 0.03 mm
10.00 mm 9.80 mm 9.70 mm 9.60 mm 9.40 mm ± 0.03 mm
12.00 mm 11.80 mm 11.70 mm 11.60 mm 11.40 mm ± 0.03 mm

Note: Custom sizes between standard OD values are available. Contact us for non-standard dimensions.

—

Wall Thickness Options by OD Range

OD Range Min Wall Thickness Max Wall Thickness Common Thickness Steps
0.30 – 0.50 mm 0.05 mm 0.15 mm 0.05, 0.08, 0.10, 0.12, 0.15
0.51 – 1.00 mm 0.08 mm 0.25 mm 0.08, 0.10, 0.12, 0.15, 0.18, 0.20, 0.25
1.01 – 2.00 mm 0.10 mm 0.50 mm 0.10, 0.12, 0.15, 0.18, 0.20, 0.25, 0.30, 0.40, 0.50
2.01 – 4.00 mm 0.15 mm 1.00 mm 0.15, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.80, 1.00
4.01 – 8.00 mm 0.20 mm 1.50 mm 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.80, 1.00, 1.20, 1.50
8.01 – 12.00 mm 0.30 mm 2.00 mm 0.30, 0.40, 0.50, 0.60, 0.80, 1.00, 1.20, 1.50, 2.00

—

Standard Length and Tolerance Specification

Parameter Standard Custom Option Tolerance
Standard Length 1000 mm 500 – 2500 mm ± 1.0 mm
Precision Cut Length – 10 – 500 mm ± 0.10 mm (laser cut)
Ultra-Precision Cut – 1 – 50 mm ± 0.01 mm (laser)
Straightness 1.0 mm/m 0.5 mm/m Per ASTM A269
Surface Roughness (Ra) ≤ 0.8 μm ≤ 0.2 μm (electropolished) Measured per ASTM B912

—

Gauge Size Equivalents (Birmingham / Stubs)

For international customers who reference gauge sizes, here is the approximate conversion chart:

Gauge (BWG) Approx. OD Common Applications
30 Ga 0.30 mm Micro needle tubes, sensor probes
28 Ga 0.36 mm Fine injection tubes
26 Ga 0.46 mm Hypodermic tubing, micro fluidics
25 Ga 0.51 mm Standard hypodermic needles
24 Ga 0.56 mm General capillary tube applications
22 Ga 0.71 mm Blood collection, infusion tubes
20 Ga 0.81 mm Industrial dispensing needles
18 Ga 1.24 mm Larger medical/surgical tubes
16 Ga 1.65 mm Industrial instrumentation tubes
14 Ga 2.11 mm Hydraulic and pneumatic tubes
12 Ga 2.77 mm Structural support tubes
10 Ga 3.40 mm Heavy-duty industrial tubes

—

Surface Finish Options

Finish Type Ra Value Appearance Best For
Bright Annealed ≤ 0.8 μm Bright, smooth surface General purpose, cost-effective
Electropolished ≤ 0.4 μm Mirror-like, high luster Medical, pharmaceutical, clean room
Mechanical Polish ≤ 0.2 μm Ultra-smooth surface High-precision applications, sealing surfaces
Passivated – Enhanced oxide layer Improved corrosion resistance

—

Material Grades Available

Grade Standard Key Property Available Sizes
304 Stainless Steel UNS S30400 / ASTM A269 Excellent general corrosion resistance Full range 0.30 – 12.00 mm
304L Stainless Steel UNS S30403 Low carbon for better weldability 0.50 – 8.00 mm
316 Stainless Steel UNS S31600 Molybdenum-enhanced corrosion resistance 0.50 – 10.00 mm
316L Stainless Steel UNS S31603 Low carbon, superior for welded applications Full range 0.30 – 12.00 mm
316LVM UNS S31673 Vacuum melt, ultra-clean for implantable devices 0.30 – 6.00 mm

—

How to Read a Capillary Tube Specification

Capillary tube dimensions are typically expressed in the format: OD x ID x WT or OD x WT.

For example: 2.10 mm OD x 1.80 mm ID x 0.15 mm WT

  • OD (Outer Diameter): The overall outside dimension of the tube
  • ID (Inner Diameter): The internal opening dimension
  • WT (Wall Thickness): The thickness of the tube wall

The relationship is: OD = ID + 2 × WT

If you specify any two of these three dimensions, the third can be calculated. However, for precision applications, we recommend specifying all three to ensure the correct tube for your needs.

—

Custom Size Availability

Need a size not listed in our standard chart? We offer custom capillary tube manufacturing for non-standard dimensions:

  • Custom OD: Any dimension within our 0.20 – 12.00 mm range
  • Custom Wall Thickness: Custom WT available on request
  • Custom Lengths: From 1 mm to 3000 mm
  • Custom Tolerances: Tighter tolerances available for specialized applications

Contact us with your specifications for a custom quotation.

—

Download Capillary Tube Size Chart

For easy reference, save this page or bookmark our size chart. All listed dimensions are available for immediate order. For questions about specific sizes or custom requirements, our technical team is ready to assist.

📧 Email us your dimensional requirements

🌐 Browse all capillary tube specifications by outer diameter

Related Resources:

  • 304 vs 316L Capillary Tubes Comparison Guide
  • Capillary Tube Wall Thickness Selection Guide
  • Capillary Tube Surface Finish Options
2026051603321799
Previous post: 304 vs 316L Stainless Steel Capillary Tubes – Complete Comparison Guide Next post: Stainless Steel Capillary Tubes Applications – Comprehensive Industry Guide
Healsmed

Leading Stainless Steel Capillary Tube Factory. 1,400+ standard sizes IN STOCK & ready to ship worldwide! High precision, factory-direct price.

© 2026 Healsmed. All rights reserved.

Online Online