What Do The Marks on A Bolt Head Mean? A Practical Guide for Engineers and Inspectors
Many engineers and procurement professionals make costly mistakes due to misreading bolt head markings. This article helps you quickly decode these marks, reducing procurement errors and quality issues. Bolt head markings are standardized symbols—combinations of letters, numbers, and radial lines—that indicate a bolt’s material grade, strength, manufacturing origin, and sometimes even its corrosion resistance. For […]
