Stainless Steel Tubing

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Shop stainless steel tubing for commercial, industrial, mechanical, instrumentation, and process applications. PipingNow carries round, square, rectangular, welded, seamless, instrumentation, and mechanical stainless steel tubing in a wide range of sizes and material grades. This collection includes 304 stainless steel, 316 stainless steel, 304L stainless steel, and 316L stainless steel tubing. Available options include outside diameters starting at 1/8 in, larger tubing sizes up to 4-1/2 in, and select metric outside diameter options. Types of Stainless Steel Tubing PipingNow offers several stainless steel tubing styles to support different applications and installation requirements. Use the filters on this page to narrow the collection by tubing type, size, outside diameter, material, and category. Round stainless steel tubing: Commonly used in process, instrumentation, mechanical, and structural applications. Square stainless steel tubing: Often used for fabrication, frames, supports, guards, and structural applications. Rectangular stainless steel tubing: Used where strength, shape, and flat-sided support are important. Seamless stainless steel tubing: Produced without a welded seam and often selected for demanding applications or project specifications requiring seamless construction. Welded stainless steel tubing: Commonly used in general-purpose tubing applications where welded construction is acceptable. Instrumentation tubing: Used in control, measurement, sampling, and process systems where clean, consistent tubing is required. Mechanical tubing: Used in fabrication, structural, support, and general mechanical applications. Available Stainless Steel Grades This collection includes stainless steel tubing in 304, 304L, 316, and 316L grades. 304 stainless steel is a common general-purpose stainless option used in a wide range of tubing applications. 304L stainless steel has a lower carbon content and may be selected for applications where weldability or proje