Stainless Steel Tube Sizes – Complete Table of Diameters, Wall Thicknesses and Weight

Stainless Steel Tube Sizes – Complete Table of Diameters, Wall Thicknesses and Weight

Choosing the correct stainless steel tube size is essential for cost, strength and installation quality. Tube size is normally defined by outside diameter and wall thickness. For example, Ø 42.4 × 2.0 mm means a 42.4 mm outside diameter and a 2.0 mm wall thickness.

Common sizes

Round stainless steel tubes are commonly supplied in diameters from 6 mm to more than 200 mm. Frequently used sizes include Ø 12, Ø 16, Ø 20, Ø 25, Ø 33.7, Ø 38, Ø 42.4, Ø 48.3, Ø 60.3, Ø 76.1, Ø 88.9 and Ø 114.3 mm. Wall thicknesses typically range from 1.0 mm to 6.0 mm depending on the use.

Handrails and architectural use

For handrails, Ø 42.4 × 2.0 mm is one of the most common choices. It offers a comfortable grip and enough strength for typical bracket spacing. Ø 33.7 mm is often used for lighter indoor rails, while Ø 48.3 mm is preferred for industrial or heavier-duty installations.

Structural and pressure use

For load-bearing structures, square and rectangular tubes are often preferred because they are easy to connect and align. Common sizes include 40 × 40, 50 × 50, 60 × 60, 80 × 80 and 100 × 100 mm. Pressure applications require calculation and a suitable standard such as EN 10217-7 for welded pressure tubes or EN 10216-5 for seamless pressure tubes.

Weight

Tube weight depends on diameter, wall thickness and material density. AISI 304 has a density of approximately 7,900 kg/m³, while AISI 316 is approximately 8,000 kg/m³. The difference in weight between the two grades is small in normal use.

Standards

Important standards include EN 10217-7 for welded stainless pressure tubes, EN 10216-5 for seamless stainless pressure tubes, EN 10296-2 for welded structural tubes and EN 10297-2 for seamless structural tubes. EN 10204 3.1 material certificates are commonly required for traceability.

When requesting a quote, provide the outside diameter, wall thickness, material grade, length, quantity, surface finish and certificate requirement. Kominox supplies stainless steel tubes in standard and project-specific sizes.