Structural Steel and Bolting Special Inspector Category S1 The S1 credential is the gateway for inspectors seeking specialized authority over structural steel fabrication and bolted connections on active construction sites. Progression to higher categories (S2, S3) requires this foundational certification, making it a necessary rung in the inspector hierarchy. Your daily work verifies mill test reports, torque specifications, and connection geometry—skills that build toward supervisory roles in quality assurance departments or third-party inspection firms across commercial and infrastructure projects.
| Exam Name | Structural Steel and Bolting Special Inspector Category S1 |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
