Atlas Observer

The Atlas Observer is Atlas Tube's dedicated resource for structural engineers, architects, and fabricators working with Hollow Structural Sections (HSS). Published by Atlas Tube — North America's leading HSS producer — the Atlas Observer covers ASTM specification comparisons (A500, A1085, CSA G40.21 and beyond), practical structural design guides, and deep technical insights on connection design, design wall thickness, new design tools, and seismic applications.

Product Showdown: A500 vs A513

by Bradlee Fletcher on April 29, 2026

At a Glance: ASTM A500 is structural tubing — Hollow Structural Sections (HSS) — manufactured for load-bearing applications and backed by a Mill Test Report (MTR) verifying yield strength, tensile strength, and elongation. ASTM A513 is mechanical tubing built for dimensional precision, with no physical property reporting required. Specify A...

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Deep Foundations Start with Atlas Pipe Piles

by Bradlee Fletcher on March 25, 2026

Every large structure, from soaring skyscrapers to sprawling bridges, relies on a solid foundation to establish structural integrity and safety. For projects demanding foundational support in challenging soil conditions, deep foundation systems are critical. Among the list of reliable solutions is straight-seam ERW steel...

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A Deep Dive into ASTM A500 HSS for Structural Applications

by Bradlee Fletcher on March 16, 2026

At a Glance: ASTM A500 defines cold-formed carbon steel structural tubing in round, square, and rectangular shapes — the standard for most HSS used in North American structural projects. Grade C is the most widely specified grade, delivering 50 ksi yield for square and rectangular sections and 46 ksi for round. Its closed geometr...

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