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Stainless Steel Tube Size Chart
Stainless Steel Tube Size Chart: Dimensions, Wall Thickness, Weight & Selection Guide
A Stainless Steel Tube Size Chart is a comprehensive reference that lists the standard outside diameter (OD), wall thickness (WT), inside diameter (ID), and available lengths of stainless steel tubes. It enables engineers, contractors, fabricators, and buyers to select the correct tube dimensions for pressure, structural, sanitary, heat exchanger, and instrumentation applications. Tube sizes are manufactured in accordance with international standards such as ASTM A213, ASTM A249, ASTM A269, ASTM A270, ASTM A554, and ASME specifications to ensure dimensional accuracy and reliable performance.
Stainless steel tubes are available in seamless and welded forms, with sizes ranging from small precision tubing to large-diameter industrial tubes. Depending on the application, tubes are supplied in round, square, and rectangular profiles with various wall thicknesses and surface finishes, including mill finish, bright annealed (BA), polished, and electropolished. Common grades include Stainless Steel 304, 304L, 316, 316L, 321, 310S, Duplex, and Super Duplex, offering excellent corrosion resistance, strength, and durability.
The stainless steel tube size charts below provide detailed information on tube dimensions, metric sizes, round, square, and rectangular tube sizes, seamless and welded tube dimensions, standard wall thicknesses, and tube weight calculations. Whether you are selecting tubing for chemical processing, food and beverage, pharmaceutical, oil and gas, marine, construction, or heat exchanger applications, these charts will help you identify the most suitable stainless steel tube size for your project.
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Stainless Steel Tube Size Chart
| Nominal Tube Size | Outside Diameter (OD) | Common Wall Thickness | Inside Diameter (Approx.) | Standard Length | Typical Applications |
|---|---|---|---|---|---|
| 1/4" | 6.35 mm | 0.89 – 1.65 mm | 4.57 – 2.99 mm | 6 m | Instrumentation |
| 3/8" | 9.53 mm | 0.89 – 1.65 mm | 7.75 – 6.23 mm | 6 m | Hydraulic Systems |
| 1/2" | 12.70 mm | 0.89 – 2.11 mm | 10.92 – 8.48 mm | 6 m | Food & Beverage |
| 3/4" | 19.05 mm | 0.89 – 2.11 mm | 17.27 – 14.83 mm | 6 m | Heat Exchangers |
| 1" | 25.40 mm | 1.24 – 2.77 mm | 22.92 – 19.86 mm | 6 m | Chemical Processing |
| 1½" | 38.10 mm | 1.24 – 3.05 mm | 35.62 – 32.00 mm | 6 m | Pharmaceutical Plants |
| 2" | 50.80 mm | 1.65 – 3.68 mm | 47.50 – 43.44 mm | 6 m | Process Piping |
| 2½" | 63.50 mm | 1.65 – 3.91 mm | 60.20 – 55.68 mm | 6 m | Water Treatment |
| 3" | 76.20 mm | 2.11 – 4.57 mm | 71.98 – 67.06 mm | 6 m | Power Plants |
| 4" | 101.60 mm | 2.11 – 6.02 mm | 97.38 – 89.56 mm | 6 m | Oil & Gas Industry |
Stainless Steel Tube Dimensions Chart
| Nominal Tube Size | Outside Diameter (OD) | Wall Thickness (WT) | Inside Diameter (Approx. ID) | Standard Length |
|---|---|---|---|---|
| 1/4" | 6.35 mm | 0.89 mm | 4.57 mm | 6 m |
| 3/8" | 9.53 mm | 0.89 mm | 7.75 mm | 6 m |
| 1/2" | 12.70 mm | 1.24 mm | 10.22 mm | 6 m |
| 3/4" | 19.05 mm | 1.65 mm | 15.75 mm | 6 m |
| 1" | 25.40 mm | 1.65 mm | 22.10 mm | 6 m |
| 1-1/2" | 38.10 mm | 1.65 mm | 34.80 mm | 6 m |
| 2" | 50.80 mm | 2.11 mm | 46.58 mm | 6 m |
| 2-1/2" | 63.50 mm | 2.77 mm | 57.96 mm | 6 m |
| 3" | 76.20 mm | 2.77 mm | 70.66 mm | 6 m |
| 4" | 101.60 mm | 3.05 mm | 95.50 mm | 6 m |
Stainless Steel Tube Sizes Chart in mm
Stainless steel tubes are commonly manufactured in metric sizes for industrial, structural, sanitary, and mechanical applications. The chart below lists standard outside diameters (OD), common wall thicknesses, and standard lengths in millimeters to help you select the appropriate tube size for your project.
| Outside Diameter (OD) | Common Wall Thickness (mm) | Approx. Inside Diameter (ID) | Standard Length |
|---|---|---|---|
| 6 mm | 0.5 – 1.0 | 5.0 – 4.0 mm | 6000 mm |
| 8 mm | 0.5 – 1.2 | 7.0 – 5.6 mm | 6000 mm |
| 10 mm | 0.7 – 1.5 | 8.6 – 7.0 mm | 6000 mm |
| 12 mm | 0.8 – 2.0 | 10.4 – 8.0 mm | 6000 mm |
| 16 mm | 1.0 – 2.5 | 14.0 – 11.0 mm | 6000 mm |
| 20 mm | 1.0 – 3.0 | 18.0 – 14.0 mm | 6000 mm |
| 25 mm | 1.2 – 3.0 | 22.6 – 19.0 mm | 6000 mm |
| 32 mm | 1.2 – 3.0 | 29.6 – 26.0 mm | 6000 mm |
| 38 mm | 1.5 – 3.5 | 35.0 – 31.0 mm | 6000 mm |
| 50 mm | 1.5 – 4.0 | 47.0 – 42.0 mm | 6000 mm |
| 63.5 mm | 2.0 – 4.0 | 59.5 – 55.5 mm | 6000 mm |
| 76.2 mm | 2.0 – 5.0 | 72.2 – 66.2 mm | 6000 mm |
| 101.6 mm | 2.5 – 6.0 | 96.6 – 89.6 mm | 6000 mm |
Stainless Steel Round Tube Size Chart
Round stainless steel tubes are the most widely used tubing products for industrial, sanitary, structural, and mechanical applications. They are manufactured in seamless and welded forms with various outside diameters, wall thicknesses, and lengths to meet ASTM and ASME standards. The chart below shows some of the commonly available round stainless steel tube sizes.
| Outside Diameter (OD) | Wall Thickness (mm) | Standard Length | Common Grades |
|---|---|---|---|
| 6.35 mm (1/4") | 0.89 – 1.65 | 6 m | 304 / 316 |
| 9.53 mm (3/8") | 0.89 – 1.65 | 6 m | 304 / 316 |
| 12.70 mm (1/2") | 0.89 – 2.11 | 6 m | 304 / 316 / 321 |
| 19.05 mm (3/4") | 1.00 – 2.77 | 6 m | 304 / 316 |
| 25.40 mm (1") | 1.24 – 3.05 | 6 m | 304 / 316 / 310S |
| 38.10 mm (1-1/2") | 1.50 – 3.68 | 6 m | 304 / 316 |
| 50.80 mm (2") | 1.65 – 4.00 | 6 m | 304 / 316 |
| 76.20 mm (3") | 2.11 – 5.00 | 6 m | 304 / 316 |
| 101.60 mm (4") | 2.77 – 6.35 | 6 m | 304 / 316 |
Stainless Steel Square Tube Sizes Chart
Square stainless steel tubes are widely used in architectural fabrication, handrails, furniture, structural frameworks, and construction projects. They are available in various outside dimensions and wall thicknesses with mill, polished, or brushed finishes.
| Square Size (mm) | Wall Thickness (mm) | Standard Length | Common Grades |
|---|---|---|---|
| 12 × 12 | 1.0 – 1.5 | 6 m | 304 / 316 |
| 20 × 20 | 1.2 – 2.0 | 6 m | 304 / 316 |
| 25 × 25 | 1.2 – 2.5 | 6 m | 304 / 316 |
| 30 × 30 | 1.5 – 3.0 | 6 m | 304 / 316 |
| 40 × 40 | 1.5 – 3.0 | 6 m | 304 / 316 |
| 50 × 50 | 1.5 – 4.0 | 6 m | 304 / 316 |
| 75 × 75 | 2.0 – 5.0 | 6 m | 304 / 316 |
| 100 × 100 | 2.0 – 6.0 | 6 m | 304 / 316 |
Stainless Steel Rectangular Tube Size Chart
Rectangular stainless steel tubes provide excellent strength-to-weight ratio and are commonly used in construction, fabrication, industrial equipment, automotive components, and decorative applications. They are available in multiple width, height, and wall thickness combinations.
| Tube Size (mm) | Wall Thickness (mm) | Standard Length | Common Grades |
|---|---|---|---|
| 20 × 10 | 1.0 – 2.0 | 6 m | 304 / 316 |
| 30 × 20 | 1.2 – 2.5 | 6 m | 304 / 316 |
| 40 × 20 | 1.2 – 3.0 | 6 m | 304 / 316 |
| 50 × 25 | 1.5 – 3.0 | 6 m | 304 / 316 |
| 60 × 40 | 1.5 – 4.0 | 6 m | 304 / 316 |
| 80 × 40 | 2.0 – 4.0 | 6 m | 304 / 316 |
| 100 × 50 | 2.0 – 5.0 | 6 m | 304 / 316 |
| 120 × 60 | 2.0 – 6.0 | 6 m | 304 / 316 |
Seamless Stainless Steel Tubing Size Chart
Seamless stainless steel tubes are manufactured without a welded seam, providing superior strength, pressure resistance, and corrosion performance. They are widely used in heat exchangers, boilers, condensers, instrumentation, hydraulic systems, oil & gas, petrochemical plants, and power generation industries.
| Outside Diameter (OD) | Wall Thickness (mm) | Standard Length | Available Grades |
|---|---|---|---|
| 6.35 mm | 0.89 – 1.65 | 6 m | 304, 304L, 316, 316L |
| 12.70 mm | 1.24 – 2.11 | 6 m | 304, 316 |
| 19.05 mm | 1.24 – 2.77 | 6 m | 304, 316, 321 |
| 25.40 mm | 1.65 – 3.05 | 6 m | 304, 316, 310S |
| 38.10 mm | 1.65 – 3.68 | 6 m | 304, 316 |
| 50.80 mm | 2.11 – 4.00 | 6 m | 304, 316 |
| 76.20 mm | 2.77 – 5.00 | 6 m | 304, 316 |
| 101.60 mm | 3.05 – 6.35 | 6 m | 304, 316 |
SS 304 Tube Size Chart
SS 304 stainless steel tubes are the most commonly used tubing products due to their excellent corrosion resistance, weldability, and cost-effectiveness. They are available in seamless and welded forms for industrial, sanitary, structural, and architectural applications.
| Outside Diameter (OD) | Wall Thickness (mm) | Standard Length | Tube Type |
|---|---|---|---|
| 6.35 mm | 0.89 – 1.65 | 6 m | Seamless / Welded |
| 12.70 mm | 0.89 – 2.11 | 6 m | Seamless / Welded |
| 19.05 mm | 1.24 – 2.77 | 6 m | Seamless / Welded |
| 25.40 mm | 1.65 – 3.05 | 6 m | Seamless / Welded |
| 38.10 mm | 1.65 – 3.68 | 6 m | Seamless / Welded |
| 50.80 mm | 2.11 – 4.00 | 6 m | Seamless / Welded |
| 76.20 mm | 2.77 – 5.00 | 6 m | Seamless / Welded |
| 101.60 mm | 3.05 – 6.35 | 6 m | Seamless / Welded |
Stainless Steel Tube Sizes Chart UK
In the United Kingdom, stainless steel tubes are commonly supplied according to BS EN and ASTM standards. Metric outside diameters are widely used across fabrication, construction, food processing, pharmaceutical, and engineering industries.
| Outside Diameter (mm) | Wall Thickness (mm) | Standard Length | Common Standard |
|---|---|---|---|
| 12 | 1.0 | 6 m | BS EN 10217 / ASTM |
| 15 | 1.2 | 6 m | BS EN 10217 / ASTM |
| 22 | 1.2 | 6 m | BS EN 10217 / ASTM |
| 28 | 1.5 | 6 m | BS EN 10217 / ASTM |
| 35 | 1.5 | 6 m | BS EN 10217 / ASTM |
| 42 | 1.5 | 6 m | BS EN 10217 / ASTM |
| 54 | 2.0 | 6 m | BS EN 10217 / ASTM |
Stainless Steel Tube Standard Size Chart India
In India, stainless steel tubes are manufactured according to ASTM, ASME, and IS standards. Standard sizes are available in seamless and welded construction for industrial, structural, pharmaceutical, dairy, food processing, and engineering applications.
| Outside Diameter (OD) | Wall Thickness (mm) | Standard Length | Common Grades |
|---|---|---|---|
| 6 mm | 0.5 – 1.0 | 6 m | 304 / 316 |
| 12 mm | 0.8 – 2.0 | 6 m | 304 / 316 |
| 20 mm | 1.0 – 3.0 | 6 m | 304 / 316 |
| 25 mm | 1.2 – 3.0 | 6 m | 304 / 316 |
| 38 mm | 1.5 – 4.0 | 6 m | 304 / 316 |
| 50 mm | 2.0 – 4.0 | 6 m | 304 / 316 |
| 76 mm | 2.0 – 5.0 | 6 m | 304 / 316 |
| 101.6 mm | 2.5 – 6.0 | 6 m | 304 / 316 |
Tube Size and Weight Chart
The weight of a stainless steel tube depends on its outside diameter, wall thickness, and material density. The table below provides approximate weights for common stainless steel tube sizes based on a standard length of one meter.
| Outside Diameter (OD) | Wall Thickness | Approx. Weight (kg/m) |
|---|---|---|
| 12.70 mm | 1.24 mm | 0.35 |
| 19.05 mm | 1.65 mm | 0.73 |
| 25.40 mm | 1.65 mm | 1.01 |
| 38.10 mm | 1.65 mm | 1.56 |
| 50.80 mm | 2.11 mm | 2.57 |
| 63.50 mm | 2.77 mm | 4.11 |
| 76.20 mm | 2.77 mm | 4.98 |
| 101.60 mm | 3.05 mm | 7.42 |
Frequently Asked Questions
A Stainless Steel Tube Size Chart provides standard tube dimensions, including outside diameter (OD), wall thickness (WT), inside diameter (ID), and standard lengths. It helps users select the correct tube size for industrial, structural, sanitary, and mechanical applications.
Standard stainless steel tubes are available in outside diameters ranging from approximately 6 mm (1/4") to over 203.2 mm (8"), with wall thicknesses from 0.5 mm to 12.7 mm depending on the applicable ASTM or ASME specification.
Stainless steel tubes are measured by their exact outside diameter and wall thickness, while pipes are designated by Nominal Pipe Size (NPS) and Schedule. Tubes are generally used where precise dimensions are required.
The most common grades include Stainless Steel 304, 304L, 316, 316L, 321, 310S, Duplex, and Super Duplex, depending on the required corrosion resistance and application.
The standard manufacturing length is generally 6 meters, although custom cut lengths and longer random lengths are also available upon request.
Yes. Stainless steel tubes are manufactured in both seamless and welded forms. Seamless tubes are preferred for high-pressure applications, while welded tubes are commonly used for structural and general industrial purposes.
The weight depends on the outside diameter, wall thickness, length, and material density. Standard tube weight charts or online weight calculators are commonly used to determine the weight per meter or per foot.
Common standards include ASTM A213, ASTM A249, ASTM A269, ASTM A270, ASTM A554, ASME SA213, and ASME SA269, depending on the intended application.