S-91309A806 5/8"-11 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
• Class 2A thread fit provides consistent, smooth assembly and reduces cross-threading risks
• External hex drive design allows for high-torque installation with standard tools, speeding up assembly
• Fully threaded coarse (UNC) design offers maximum grip and load distribution across the entire length
• Rockwell B69 hardness maintains structural integrity and resists wear during repeated use
• Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 5/8"-11 UNC hex head screws address critical challenges in construction, machinery assembly, and structural framing. The steel construction with zinc plating combats rust and corrosion in humid or outdoor settings, while the coarse thread and Class 2A fit ensure rapid, secure fastening even in materials prone to stripping. With a 60,000 psi tensile strength and external hex drive, they provide dependable clamping force for high-stress connections, reducing maintenance needs and enhancing operational safety in industrial fastening solutions.

Specification Summary & Compliance

This product features a 5/8"-11 UNC coarse thread with Class 2A tolerance for precise fit, manufactured to ASME B18.2.1 and ASTM A307 specifications. It is fully compliant with RoHS 3 (2015/863/EU) regulations, ensuring environmental safety and suitability for global industrial supply chains.