Steel Tube Institute guide explains how to check HSS tolerances

The Hollow Structural Sections Committee of the Steel Tube Institute has introduced an updated technical guide, “Methods to Check Dimensional Tolerances on Hollow Structural Sections,” to help fabricators and service centers. Available on the STI website, it discusses and illustrates the latest methods to measure tolerances of HSS correctly.

The guide helps professionals verify compliance with ASTM specifications. While it is written for the A500 specification, it may be used for verifying tolerances for A1085, A847, A1065, and similar tubular specifications. The resource outlines instructions for checking tolerances for outside dimensions, wall thickness, length and straightness, squareness of sides, radius of corners, and twist of the member.