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.

Designing with HSS: How the ERW Manufacturing Process Works

by Bradlee Fletcher on September 9, 2026

Electric resistance welding (ERW) is the primary manufacturing process used to produce hollow structural sections (HSS) in North America. Each of the seven stages in an ERW tube mill, from coil entry through quality inspection, directly determines the dimensional accuracy, weld integrity, and mechanical properties of the finished section. Knowing w...

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Common HSS Specifications in North America: 2026 Guide

by Bradlee Fletcher on July 8, 2026

HSS continues to gain popularity in structural steel design — from column grids in commercial buildings to bridge components in seismic zones. With multiple specifications governing their production, choosing the right spec for a given application is crucial for success in designing with HSS....

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